<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2021 Workiva-->
<!--r:e4be6f26-b80a-4a27-9ecb-4271da58c4ed,g:a30a1882-9ca6-4ad4-83cf-47b64c399447-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:alg="http://www.alamo-group.com/20201231" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.alamo-group.com/20201231">
  <xs:import namespace="http://fasb.org/srt/2020-01-31" schemaLocation="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2020-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd"/>
  <xs:import namespace="http://www.w3.org/1999/xlink" schemaLocation="http://www.xbrl.org/2003/xlink-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd"/>
  <xs:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/country/2020-01-31" schemaLocation="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2020-01-31" schemaLocation="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd"/>
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="alg-20201231_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="alg-20201231_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="alg-20201231_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="alg-20201231_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="Cover" roleURI="http://www.alamo-group.com/role/Cover">
        <link:definition>0001001 - Document - Cover</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedBalanceSheets" roleURI="http://www.alamo-group.com/role/ConsolidatedBalanceSheets">
        <link:definition>1001002 - Statement - Consolidated Balance Sheets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedBalanceSheetsParenthetical" roleURI="http://www.alamo-group.com/role/ConsolidatedBalanceSheetsParenthetical">
        <link:definition>1002003 - Statement - Consolidated Balance Sheets (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofIncome" roleURI="http://www.alamo-group.com/role/ConsolidatedStatementsofIncome">
        <link:definition>1003004 - Statement - Consolidated Statements of Income</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofComprehensiveIncome" roleURI="http://www.alamo-group.com/role/ConsolidatedStatementsofComprehensiveIncome">
        <link:definition>1004005 - Statement - Consolidated Statements of Comprehensive Income</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofStockholdersEquity" roleURI="http://www.alamo-group.com/role/ConsolidatedStatementsofStockholdersEquity">
        <link:definition>1005006 - Statement - Consolidated Statements of Stockholders' Equity</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofStockholdersEquityParenthetical" roleURI="http://www.alamo-group.com/role/ConsolidatedStatementsofStockholdersEquityParenthetical">
        <link:definition>1006007 - Statement - Consolidated Statements of Stockholders' Equity (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofCashFlows" roleURI="http://www.alamo-group.com/role/ConsolidatedStatementsofCashFlows">
        <link:definition>1007008 - Statement - Consolidated Statements of Cash Flows</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SignificantAccountingPolicies" roleURI="http://www.alamo-group.com/role/SignificantAccountingPolicies">
        <link:definition>2101101 - Disclosure - Significant Accounting Policies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SignificantAccountingPoliciesPolicies" roleURI="http://www.alamo-group.com/role/SignificantAccountingPoliciesPolicies">
        <link:definition>2202201 - Disclosure - Significant Accounting Policies (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SignificantAccountingPoliciesTables" roleURI="http://www.alamo-group.com/role/SignificantAccountingPoliciesTables">
        <link:definition>2303301 - Disclosure - Significant Accounting Policies (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SignificantAccountingPoliciesAdditionalInformationDetails" roleURI="http://www.alamo-group.com/role/SignificantAccountingPoliciesAdditionalInformationDetails">
        <link:definition>2404401 - Disclosure - Significant Accounting Policies - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SignificantAccountingPoliciesScheduleofFairValueAssumptionsandMethodologyDetails" roleURI="http://www.alamo-group.com/role/SignificantAccountingPoliciesScheduleofFairValueAssumptionsandMethodologyDetails">
        <link:definition>2405402 - Disclosure - Significant Accounting Policies (Schedule of Fair Value Assumptions and Methodology) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccountingPronouncements" roleURI="http://www.alamo-group.com/role/AccountingPronouncements">
        <link:definition>2106102 - Disclosure - Accounting Pronouncements</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BusinessCombinations" roleURI="http://www.alamo-group.com/role/BusinessCombinations">
        <link:definition>2107103 - Disclosure - Business Combinations</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BusinessCombinationsTables" roleURI="http://www.alamo-group.com/role/BusinessCombinationsTables">
        <link:definition>2308302 - Disclosure - Business Combinations (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BusinessCombinationsAdditionalInformationDetails" roleURI="http://www.alamo-group.com/role/BusinessCombinationsAdditionalInformationDetails">
        <link:definition>2409403 - Disclosure - Business Combinations - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BusinessCombinationsScheduleofAssetsAcquiredandLiabilitiesAssumedDetails" roleURI="http://www.alamo-group.com/role/BusinessCombinationsScheduleofAssetsAcquiredandLiabilitiesAssumedDetails">
        <link:definition>2410404 - Disclosure - Business Combinations - Schedule of Assets Acquired and Liabilities Assumed (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EarningsPerShare" roleURI="http://www.alamo-group.com/role/EarningsPerShare">
        <link:definition>2111104 - Disclosure - Earnings Per Share</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EarningsPerShareTables" roleURI="http://www.alamo-group.com/role/EarningsPerShareTables">
        <link:definition>2312303 - Disclosure - Earnings Per Share (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EarningsPerShareDetails" roleURI="http://www.alamo-group.com/role/EarningsPerShareDetails">
        <link:definition>2413405 - Disclosure - Earnings Per Share (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ValuationandQualifyingAccounts" roleURI="http://www.alamo-group.com/role/ValuationandQualifyingAccounts">
        <link:definition>2114105 - Disclosure - Valuation and Qualifying Accounts</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ValuationandQualifyingAccountsTables" roleURI="http://www.alamo-group.com/role/ValuationandQualifyingAccountsTables">
        <link:definition>2315304 - Disclosure - Valuation and Qualifying Accounts (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ValuationandQualifyingAccountsScheduleofValuationandQualifyingAccountsDetails" roleURI="http://www.alamo-group.com/role/ValuationandQualifyingAccountsScheduleofValuationandQualifyingAccountsDetails">
        <link:definition>2416406 - Disclosure - Valuation and Qualifying Accounts (Schedule of Valuation and Qualifying Accounts) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ValuationandQualifyingAccountsAdditionalInformationDetails" roleURI="http://www.alamo-group.com/role/ValuationandQualifyingAccountsAdditionalInformationDetails">
        <link:definition>2417407 - Disclosure - Valuation and Qualifying Accounts - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Inventories" roleURI="http://www.alamo-group.com/role/Inventories">
        <link:definition>2118106 - Disclosure - Inventories</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InventoriesTables" roleURI="http://www.alamo-group.com/role/InventoriesTables">
        <link:definition>2319305 - Disclosure - Inventories (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InventoriesAdditionalInformationDetails" roleURI="http://www.alamo-group.com/role/InventoriesAdditionalInformationDetails">
        <link:definition>2420408 - Disclosure - Inventories - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InventoriesScheduleofInventoryCurrentDetails" roleURI="http://www.alamo-group.com/role/InventoriesScheduleofInventoryCurrentDetails">
        <link:definition>2421409 - Disclosure - Inventories (Schedule of Inventory, Current) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PropertyPlantandEquipment" roleURI="http://www.alamo-group.com/role/PropertyPlantandEquipment">
        <link:definition>2122107 - Disclosure - Property, Plant and Equipment</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PropertyPlantandEquipmentTables" roleURI="http://www.alamo-group.com/role/PropertyPlantandEquipmentTables">
        <link:definition>2323306 - Disclosure - Property, Plant and Equipment (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PropertyPlantandEquipmentDetails" roleURI="http://www.alamo-group.com/role/PropertyPlantandEquipmentDetails">
        <link:definition>2424410 - Disclosure - Property, Plant and Equipment (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Goodwill" roleURI="http://www.alamo-group.com/role/Goodwill">
        <link:definition>2125108 - Disclosure - Goodwill</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GoodwillTables" roleURI="http://www.alamo-group.com/role/GoodwillTables">
        <link:definition>2326307 - Disclosure - Goodwill (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GoodwillDetails" roleURI="http://www.alamo-group.com/role/GoodwillDetails">
        <link:definition>2427411 - Disclosure - Goodwill (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DefiniteandIndefiniteLivedIntangibleAssets" roleURI="http://www.alamo-group.com/role/DefiniteandIndefiniteLivedIntangibleAssets">
        <link:definition>2128109 - Disclosure - Definite- and Indefinite-Lived Intangible Assets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DefiniteandIndefiniteLivedIntangibleAssetsTables" roleURI="http://www.alamo-group.com/role/DefiniteandIndefiniteLivedIntangibleAssetsTables">
        <link:definition>2329308 - Disclosure - Definite- and Indefinite-Lived Intangible Assets (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DefiniteandIndefiniteLivedIntangibleAssetsScheduleofDefiniteandIndefiniteLivedIntangibleAssetsDetails" roleURI="http://www.alamo-group.com/role/DefiniteandIndefiniteLivedIntangibleAssetsScheduleofDefiniteandIndefiniteLivedIntangibleAssetsDetails">
        <link:definition>2430412 - Disclosure - Definite- and Indefinite-Lived Intangible Assets (Schedule of Definite and Indefinite Lived Intangible Assets) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DefiniteandIndefiniteLivedIntangibleAssetsAdditionalInformationDetails" roleURI="http://www.alamo-group.com/role/DefiniteandIndefiniteLivedIntangibleAssetsAdditionalInformationDetails">
        <link:definition>2431413 - Disclosure - Definite- and Indefinite-Lived Intangible Assets - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Leases" roleURI="http://www.alamo-group.com/role/Leases">
        <link:definition>2132110 - Disclosure - Leases</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesTables" roleURI="http://www.alamo-group.com/role/LeasesTables">
        <link:definition>2333309 - Disclosure - Leases (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesLeaseCostDetails" roleURI="http://www.alamo-group.com/role/LeasesLeaseCostDetails">
        <link:definition>2434414 - Disclosure - Leases - Lease Cost (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesMaturityScheduleDetails" roleURI="http://www.alamo-group.com/role/LeasesMaturityScheduleDetails">
        <link:definition>2435415 - Disclosure - Leases - Maturity Schedule (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesMaturityScheduleDetails_1" roleURI="http://www.alamo-group.com/role/LeasesMaturityScheduleDetails_1">
        <link:definition>2435415 - Disclosure - Leases - Maturity Schedule (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesAdditionalInformationDetails" roleURI="http://www.alamo-group.com/role/LeasesAdditionalInformationDetails">
        <link:definition>2436416 - Disclosure - Leases - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesSupplementalBalanceSheetInformationDetails" roleURI="http://www.alamo-group.com/role/LeasesSupplementalBalanceSheetInformationDetails">
        <link:definition>2437417 - Disclosure - Leases - Supplemental Balance Sheet Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesSupplementalCashFlowInformationDetails" roleURI="http://www.alamo-group.com/role/LeasesSupplementalCashFlowInformationDetails">
        <link:definition>2438418 - Disclosure - Leases - Supplemental Cash Flow Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccruedLiabilities" roleURI="http://www.alamo-group.com/role/AccruedLiabilities">
        <link:definition>2139111 - Disclosure - Accrued Liabilities</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccruedLiabilitiesTables" roleURI="http://www.alamo-group.com/role/AccruedLiabilitiesTables">
        <link:definition>2340310 - Disclosure - Accrued Liabilities (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccruedLiabilitiesDetails" roleURI="http://www.alamo-group.com/role/AccruedLiabilitiesDetails">
        <link:definition>2441419 - Disclosure - Accrued Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueofFinancialInstruments" roleURI="http://www.alamo-group.com/role/FairValueofFinancialInstruments">
        <link:definition>2142112 - Disclosure - Fair Value of Financial Instruments</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LongTermDebt" roleURI="http://www.alamo-group.com/role/LongTermDebt">
        <link:definition>2143113 - Disclosure - Long-Term Debt</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LongTermDebtTables" roleURI="http://www.alamo-group.com/role/LongTermDebtTables">
        <link:definition>2344311 - Disclosure - Long-Term Debt (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LongTermDebtScheduleofLongTermDebtDetails" roleURI="http://www.alamo-group.com/role/LongTermDebtScheduleofLongTermDebtDetails">
        <link:definition>2445420 - Disclosure - Long-Term Debt (Schedule of Long-Term Debt) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LongTermDebtAdditionalInformationDetails" roleURI="http://www.alamo-group.com/role/LongTermDebtAdditionalInformationDetails">
        <link:definition>2446421 - Disclosure - Long-Term Debt - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxes" roleURI="http://www.alamo-group.com/role/IncomeTaxes">
        <link:definition>2147114 - Disclosure - Income Taxes</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesTables" roleURI="http://www.alamo-group.com/role/IncomeTaxesTables">
        <link:definition>2348312 - Disclosure - Income Taxes (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesAdditionalInformationDetails" roleURI="http://www.alamo-group.com/role/IncomeTaxesAdditionalInformationDetails">
        <link:definition>2449422 - Disclosure - Income Taxes - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesScheduleofIncomeLossbeforeProvisionforIncomeTaxesDetails" roleURI="http://www.alamo-group.com/role/IncomeTaxesScheduleofIncomeLossbeforeProvisionforIncomeTaxesDetails">
        <link:definition>2450423 - Disclosure - Income Taxes (Schedule of Income (Loss) before Provision for Income Taxes) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesScheduleofComponentsofIncomeTaxExpenseBenefitDetails" roleURI="http://www.alamo-group.com/role/IncomeTaxesScheduleofComponentsofIncomeTaxExpenseBenefitDetails">
        <link:definition>2451424 - Disclosure - Income Taxes (Schedule of Components of Income Tax Expense (Benefit)) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesIncomeTaxReconciliationDetails" roleURI="http://www.alamo-group.com/role/IncomeTaxesIncomeTaxReconciliationDetails">
        <link:definition>2452425 - Disclosure - Income Taxes (Income Tax Reconciliation) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesScheduleofDeferredTaxAssetsandLiabilitiesDetails" roleURI="http://www.alamo-group.com/role/IncomeTaxesScheduleofDeferredTaxAssetsandLiabilitiesDetails">
        <link:definition>2453426 - Disclosure - Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesScheduleofUnrecognizedTaxBenefitsDetails" roleURI="http://www.alamo-group.com/role/IncomeTaxesScheduleofUnrecognizedTaxBenefitsDetails">
        <link:definition>2454427 - Disclosure - Income Taxes (Schedule of Unrecognized Tax Benefits) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommonStock" roleURI="http://www.alamo-group.com/role/CommonStock">
        <link:definition>2155115 - Disclosure - Common Stock</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommonStockAdditionalInformationDetails" roleURI="http://www.alamo-group.com/role/CommonStockAdditionalInformationDetails">
        <link:definition>2456428 - Disclosure - Common Stock - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockOptions" roleURI="http://www.alamo-group.com/role/StockOptions">
        <link:definition>2157116 - Disclosure - Stock Options</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockOptionsTables" roleURI="http://www.alamo-group.com/role/StockOptionsTables">
        <link:definition>2358313 - Disclosure - Stock Options (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockOptionsAdditionalInformationDetails" roleURI="http://www.alamo-group.com/role/StockOptionsAdditionalInformationDetails">
        <link:definition>2459429 - Disclosure - Stock Options - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockOptionsScheduleofQualifiedStockOptionActivityDetails" roleURI="http://www.alamo-group.com/role/StockOptionsScheduleofQualifiedStockOptionActivityDetails">
        <link:definition>2460430 - Disclosure - Stock Options (Schedule of Qualified Stock Option Activity) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockOptionsScheduleofQualifiedStockOptionsOutstandingandExercisableDetails" roleURI="http://www.alamo-group.com/role/StockOptionsScheduleofQualifiedStockOptionsOutstandingandExercisableDetails">
        <link:definition>2461431 - Disclosure - Stock Options (Schedule of Qualified Stock Options Outstanding and Exercisable) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockOptionsEquityIncentivePlanDetails" roleURI="http://www.alamo-group.com/role/StockOptionsEquityIncentivePlanDetails">
        <link:definition>2462432 - Disclosure - Stock Options (Equity Incentive Plan) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockOptionsScheduleofNonQualifiedStockOptionsActivityDetails" roleURI="http://www.alamo-group.com/role/StockOptionsScheduleofNonQualifiedStockOptionsActivityDetails">
        <link:definition>2463433 - Disclosure - Stock Options (Schedule of Non-Qualified Stock Options Activity) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockOptionsScheduleofNonQualifiedStockOptionsOutstandingandExercisableDetails" roleURI="http://www.alamo-group.com/role/StockOptionsScheduleofNonQualifiedStockOptionsOutstandingandExercisableDetails">
        <link:definition>2464434 - Disclosure - Stock Options (Schedule of Non-Qualified Stock Options Outstanding and Exercisable) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockOptionsScheduleofRestrictedStockAwardActivityDetails" roleURI="http://www.alamo-group.com/role/StockOptionsScheduleofRestrictedStockAwardActivityDetails">
        <link:definition>2465435 - Disclosure - Stock Options (Schedule of Restricted Stock Award Activity) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RetirementBenefitPlans" roleURI="http://www.alamo-group.com/role/RetirementBenefitPlans">
        <link:definition>2166117 - Disclosure - Retirement Benefit Plans</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RetirementBenefitPlansTables" roleURI="http://www.alamo-group.com/role/RetirementBenefitPlansTables">
        <link:definition>2367314 - Disclosure - Retirement Benefit Plans (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RetirementBenefitPlansAdditionalInformationDetails" roleURI="http://www.alamo-group.com/role/RetirementBenefitPlansAdditionalInformationDetails">
        <link:definition>2468436 - Disclosure - Retirement Benefit Plans - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RetirementBenefitPlansScheduleofDefinedBenefitPlansDisclosuresDetails" roleURI="http://www.alamo-group.com/role/RetirementBenefitPlansScheduleofDefinedBenefitPlansDisclosuresDetails">
        <link:definition>2469437 - Disclosure - Retirement Benefit Plans (Schedule of Defined Benefit Plans Disclosures) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RetirementBenefitPlansScheduleofAssumptionsUsedDetails" roleURI="http://www.alamo-group.com/role/RetirementBenefitPlansScheduleofAssumptionsUsedDetails">
        <link:definition>2470438 - Disclosure - Retirement Benefit Plans (Schedule of Assumptions Used) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RetirementBenefitPlansScheduleofNetPeriodicBenefitCostDetails" roleURI="http://www.alamo-group.com/role/RetirementBenefitPlansScheduleofNetPeriodicBenefitCostDetails">
        <link:definition>2471439 - Disclosure - Retirement Benefit Plans (Schedule of Net Periodic Benefit Cost) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RetirementBenefitPlansWeightedAverageAssetAllocationsDetails" roleURI="http://www.alamo-group.com/role/RetirementBenefitPlansWeightedAverageAssetAllocationsDetails">
        <link:definition>2472440 - Disclosure - Retirement Benefit Plans (Weighted Average Asset Allocations) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RetirementBenefitPlansScheduleofFairValueofPlanAssetsDetails" roleURI="http://www.alamo-group.com/role/RetirementBenefitPlansScheduleofFairValueofPlanAssetsDetails">
        <link:definition>2473441 - Disclosure - Retirement Benefit Plans (Schedule of Fair Value of Plan Assets) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RetirementBenefitPlansScheduleofExpectedBenefitPaymentsDetails" roleURI="http://www.alamo-group.com/role/RetirementBenefitPlansScheduleofExpectedBenefitPaymentsDetails">
        <link:definition>2474442 - Disclosure - Retirement Benefit Plans (Schedule of Expected Benefit Payments) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueandSegmentReporting" roleURI="http://www.alamo-group.com/role/RevenueandSegmentReporting">
        <link:definition>2175118 - Disclosure - Revenue and Segment Reporting</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueandSegmentReportingTables" roleURI="http://www.alamo-group.com/role/RevenueandSegmentReportingTables">
        <link:definition>2376315 - Disclosure - Revenue and Segment Reporting (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueandSegmentReportingScheduleofSegmentReportingDetails" roleURI="http://www.alamo-group.com/role/RevenueandSegmentReportingScheduleofSegmentReportingDetails">
        <link:definition>2477443 - Disclosure - Revenue and Segment Reporting (Schedule of Segment Reporting) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueandSegmentReportingAdditionalInformationDetails" roleURI="http://www.alamo-group.com/role/RevenueandSegmentReportingAdditionalInformationDetails">
        <link:definition>2478444 - Disclosure - Revenue and Segment Reporting - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InternationalOperationsandGeographicInformation" roleURI="http://www.alamo-group.com/role/InternationalOperationsandGeographicInformation">
        <link:definition>2179119 - Disclosure - International Operations and Geographic Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InternationalOperationsandGeographicInformationTables" roleURI="http://www.alamo-group.com/role/InternationalOperationsandGeographicInformationTables">
        <link:definition>2380316 - Disclosure - International Operations and Geographic Information (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InternationalOperationsandGeographicInformationScheduleofInternationalOperationsDetails" roleURI="http://www.alamo-group.com/role/InternationalOperationsandGeographicInformationScheduleofInternationalOperationsDetails">
        <link:definition>2481445 - Disclosure - International Operations and Geographic Information (Schedule of International Operations) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InternationalOperationsandGeographicInformationScheduleofSelectedGeographicFinancialInformationDetails" roleURI="http://www.alamo-group.com/role/InternationalOperationsandGeographicInformationScheduleofSelectedGeographicFinancialInformationDetails">
        <link:definition>2482446 - Disclosure - International Operations and Geographic Information (Schedule of Selected Geographic Financial Information) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OtherCommitmentsandContingencies" roleURI="http://www.alamo-group.com/role/OtherCommitmentsandContingencies">
        <link:definition>2183120 - Disclosure - Other Commitments and Contingencies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="QuarterlyFinancialDataUnaudited" roleURI="http://www.alamo-group.com/role/QuarterlyFinancialDataUnaudited">
        <link:definition>2184121 - Disclosure - Quarterly Financial Data (Unaudited)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="QuarterlyFinancialDataUnauditedTables" roleURI="http://www.alamo-group.com/role/QuarterlyFinancialDataUnauditedTables">
        <link:definition>2385317 - Disclosure - Quarterly Financial Data (Unaudited) (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="QuarterlyFinancialDataUnauditedDetails" roleURI="http://www.alamo-group.com/role/QuarterlyFinancialDataUnauditedDetails">
        <link:definition>2486447 - Disclosure - Quarterly Financial Data (Unaudited) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="alg_TermFacilityMember" abstract="true" name="TermFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_FinanceLeaseRightofUseAssetGross" abstract="false" name="FinanceLeaseRightofUseAssetGross" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="alg_QualifiedStockOptionsExercisePriceRangeFourMember" abstract="true" name="QualifiedStockOptionsExercisePriceRangeFourMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_SECSchedule1209SalesDiscountsMember" abstract="true" name="SECSchedule1209SalesDiscountsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_WellsFargoMFSValueCITFMember" abstract="true" name="WellsFargoMFSValueCITFMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_LesseeOperatingLeaseLeaseNotYetCommencedAmount" abstract="false" name="LesseeOperatingLeaseLeaseNotYetCommencedAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="alg_AgriculturalMember" abstract="true" name="AgriculturalMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_RentalEquipmentNet" abstract="false" name="RentalEquipmentNet" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="alg_WellsFargoVoyaLargeCapGrowthCITFMember" abstract="true" name="WellsFargoVoyaLargeCapGrowthCITFMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_PaymentsForRepurchaseOfTreasuryStock" abstract="false" name="PaymentsForRepurchaseOfTreasuryStock" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="alg_InventoryReservePercentage" abstract="false" name="InventoryReservePercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="num:percentItemType"/>
  <xs:element id="alg_DeferredCompensationArrangementRequisiteServicePeriod" abstract="false" name="DeferredCompensationArrangementRequisiteServicePeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="alg_QualifiedStockOptionsExercisePriceRangeThreeMember" abstract="true" name="QualifiedStockOptionsExercisePriceRangeThreeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_IndustrialMember" abstract="true" name="IndustrialMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_DefinedBenefitPlanRetirementBenefitPercentage" abstract="false" name="DefinedBenefitPlanRetirementBenefitPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:percentItemType"/>
  <xs:element id="alg_WellsFargoMultiManagerSmallCapMember" abstract="true" name="WellsFargoMultiManagerSmallCapMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_DutchPowerCompanyBVMember" abstract="true" name="DutchPowerCompanyBVMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_DeferredCompensationArrangementwithIndividualTermOfFinalAverageSalaryUsedToDetermineRetirementBenefit" abstract="false" name="DeferredCompensationArrangementwithIndividualTermOfFinalAverageSalaryUsedToDetermineRetirementBenefit" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="alg_DefinedContributionPlanNumberOfPlans" abstract="false" name="DefinedContributionPlanNumberOfPlans" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="alg_AccountingPoliciesLineItems" abstract="true" name="AccountingPoliciesLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="alg_ScheduleofAcquiredIndefinitelivedandFiniteIntangibleAssetsbyMajorClassLineItems" abstract="true" name="ScheduleofAcquiredIndefinitelivedandFiniteIntangibleAssetsbyMajorClassLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="alg_TaxCutsAndJobActRepatriationOfForeignEarningsAmount" abstract="false" name="TaxCutsAndJobActRepatriationOfForeignEarningsAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="alg_MidCapMutualFundsMember" abstract="true" name="MidCapMutualFundsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_WellsFargoLargeCapGrowthIndexFundMember" abstract="true" name="WellsFargoLargeCapGrowthIndexFundMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_NonQualifiedOptionsMember" abstract="true" name="NonQualifiedOptionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_WellsFargoInternationalEquityIndexFundMember" abstract="true" name="WellsFargoInternationalEquityIndexFundMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_EffectiveIncomeTaxRateReconciliationPreviouslyUnrecognizedTaxBenefitAmount" abstract="false" name="EffectiveIncomeTaxRateReconciliationPreviouslyUnrecognizedTaxBenefitAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="alg_GradallCompanyEmployeesRetirementPlanMember" abstract="true" name="GradallCompanyEmployeesRetirementPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRentalEquipment" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRentalEquipment" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="alg_PartsMember" abstract="true" name="PartsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_ScheduleOfQuarterlyFinancialInformationDisclosureLineItems" abstract="true" name="ScheduleOfQuarterlyFinancialInformationDisclosureLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="alg_InventoryUsagePeriod" abstract="false" name="InventoryUsagePeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="alg_ProductWarrantyAccrualLagPeriod" abstract="false" name="ProductWarrantyAccrualLagPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="alg_OtherGeographicalAreasMember" abstract="true" name="OtherGeographicalAreasMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_TaxCutsAndJobsActIncompleteAccountingProvisionalUndistributedAccumulatedEarningsOfForeignSubsidiary" abstract="false" name="TaxCutsAndJobsActIncompleteAccountingProvisionalUndistributedAccumulatedEarningsOfForeignSubsidiary" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="alg_LiabilityDrivenSolutionMember" abstract="true" name="LiabilityDrivenSolutionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_RevenueFromContractWithCustomerShippingAndHandlingCostsPolicyTextBlock" abstract="false" name="RevenueFromContractWithCustomerShippingAndHandlingCostsPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="alg_DeferredCompensationArrangementMaximumContractualTerm" abstract="false" name="DeferredCompensationArrangementMaximumContractualTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="alg_GradallMember" abstract="true" name="GradallMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_DeferredCompensationArrangementwithIndividualDurationLimitVestedRetirementBenefitWillBePaidAfterDeathOrChangeInControl" abstract="false" name="DeferredCompensationArrangementwithIndividualDurationLimitVestedRetirementBenefitWillBePaidAfterDeathOrChangeInControl" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="alg_AverageCommonSharesAbstract" abstract="true" name="AverageCommonSharesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="alg_WellsFargoRussellTwoZeroZeroZeroIndexFundMember" abstract="true" name="WellsFargoRussellTwoZeroZeroZeroIndexFundMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_DefinedBenefitPlanNumberofDefinedBenefitPensionPlans" abstract="false" name="DefinedBenefitPlanNumberofDefinedBenefitPensionPlans" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="alg_WellsFargoCoreBondMember" abstract="true" name="WellsFargoCoreBondMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_ScheduleOfValuationAndQualifyingAccountsTableTextBlock" abstract="false" name="ScheduleOfValuationAndQualifyingAccountsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="alg_DefinedContributionPlanNumberofSubsidiaries" abstract="false" name="DefinedContributionPlanNumberofSubsidiaries" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="alg_LargeCapMutualFundsMember" abstract="true" name="LargeCapMutualFundsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_IncreaseDecreaseinRentalEquipment" abstract="false" name="IncreaseDecreaseinRentalEquipment" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="alg_EffectiveIncomeTaxRateReconciliationBeforeTaxCutsAndJobsActOf2017Percent" abstract="false" name="EffectiveIncomeTaxRateReconciliationBeforeTaxCutsAndJobsActOf2017Percent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:percentItemType"/>
  <xs:element id="alg_DeferredTaxLiabilitiesLeaseAsset" abstract="false" name="DeferredTaxLiabilitiesLeaseAsset" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="alg_SharebasedCompensationAwardTrancheFourMember" abstract="true" name="SharebasedCompensationAwardTrancheFourMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_IncomeTaxRateReconciliationForeignTaxExpense" abstract="false" name="IncomeTaxRateReconciliationForeignTaxExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="alg_ProductWarrantyAccrualPeriodOfExpensesUsedInCalculation" abstract="false" name="ProductWarrantyAccrualPeriodOfExpensesUsedInCalculation" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="alg_FormerEmployeesCoveredByPensionPlan" abstract="false" name="FormerEmployeesCoveredByPensionPlan" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="alg_WellsFargoTRowePriceILargeCapGrowthManagedCITMember" abstract="true" name="WellsFargoTRowePriceILargeCapGrowthManagedCITMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_QualifiedStockOptionsExercisePriceRangeTwoMember" abstract="true" name="QualifiedStockOptionsExercisePriceRangeTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_WellsFargoStandardAndPoorsMidCapIndexFundMember" abstract="true" name="WellsFargoStandardAndPoorsMidCapIndexFundMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentBeforeTax" abstract="false" name="OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentBeforeTax" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="alg_IncentiveStockOption2015PlanMember" abstract="true" name="IncentiveStockOption2015PlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_BushHogMember" abstract="true" name="BushHogMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_DeferredCompensationArrangementwithIndividualRetirementAge" abstract="false" name="DeferredCompensationArrangementwithIndividualRetirementAge" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="alg_LineofCreditFacilityAccordionFeatureIncreaseLimit" abstract="false" name="LineofCreditFacilityAccordionFeatureIncreaseLimit" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="alg_MarketPriceRangeCommonStockAbstract" abstract="true" name="MarketPriceRangeCommonStockAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="alg_ScheduleofAcquiredIndefinitelivedandFiniteIntangibleAssetsbyMajorClassTable" abstract="true" name="ScheduleofAcquiredIndefinitelivedandFiniteIntangibleAssetsbyMajorClassTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="alg_ProductWarrantyAccrualPeriodForSalesUsedInCalculation" abstract="false" name="ProductWarrantyAccrualPeriodForSalesUsedInCalculation" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="alg_TRowePriceEquityIncomeMember" abstract="true" name="TRowePriceEquityIncomeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_ScheduleOfQuarterlyFinancialInformationDisclosureTable" abstract="true" name="ScheduleOfQuarterlyFinancialInformationDisclosureTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="alg_AccountingPoliciesTable" abstract="true" name="AccountingPoliciesTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="alg_DebtInstrumentNumberOfCovenants" abstract="false" name="DebtInstrumentNumberOfCovenants" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="alg_QualifiedStockOptionsMember" abstract="true" name="QualifiedStockOptionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_PercentageOfFinalThreeYearsAverageSalaryRetirementBenefitAssumption" abstract="false" name="PercentageOfFinalThreeYearsAverageSalaryRetirementBenefitAssumption" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:percentItemType"/>
  <xs:element id="alg_ProductWarrantyPeriod" abstract="false" name="ProductWarrantyPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="alg_InternationalOperationsAndGeographicInformationTextBlock" abstract="false" name="InternationalOperationsAndGeographicInformationTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="alg_CurrentEmployeesCoveredByPensionPlan" abstract="false" name="CurrentEmployeesCoveredByPensionPlan" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="alg_InternationalMutualFundsMember" abstract="true" name="InternationalMutualFundsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_WellsFargoLargeCapValueIndexFundMember" abstract="true" name="WellsFargoLargeCapValueIndexFundMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxedIncomeAmount" abstract="false" name="EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxedIncomeAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="alg_IncomeTaxExpenseBenefitBeforeTaxCutsAndJobsActOf2017" abstract="false" name="IncomeTaxExpenseBenefitBeforeTaxCutsAndJobsActOf2017" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="alg_SecondAmendedAndRestatedRevolvingCreditAgreementMember" abstract="true" name="SecondAmendedAndRestatedRevolvingCreditAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_TwoZeroZeroNineEquityIncentivePlanMember" abstract="true" name="TwoZeroZeroNineEquityIncentivePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherLiabilities" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="alg_WholegoodUnitsMember" abstract="true" name="WholegoodUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_FinanceLeaseLiabilityMember" abstract="true" name="FinanceLeaseLiabilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_DeferredTaxAssetsLeaseLiability" abstract="false" name="DeferredTaxAssetsLeaseLiability" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="alg_MorbarkLLCMember" abstract="true" name="MorbarkLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_NonQualifiedStockOptionsExercisePriceRangeThreeMember" abstract="true" name="NonQualifiedStockOptionsExercisePriceRangeThreeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_CashAndShortTermInvestmentsMember" abstract="true" name="CashAndShortTermInvestmentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_SupplementalCashFlowInformationRelatedToLeasesTableTextBlock" abstract="false" name="SupplementalCashFlowInformationRelatedToLeasesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="alg_AssetsAndLiabilitiesLesseeTableTextBlock" abstract="false" name="AssetsAndLiabilitiesLesseeTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="alg_WellsFargoCausewayMember" abstract="true" name="WellsFargoCausewayMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_SharebasedCompensationAwardTrancheFiveMember" abstract="true" name="SharebasedCompensationAwardTrancheFiveMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="alg_InternationalAssociationOfMachinistAndAerospaceRetirementPlanMember" abstract="true" name="InternationalAssociationOfMachinistAndAerospaceRetirementPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
</xs:schema>
