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<!-- DFIN ActiveDisclosure(SM) XBRL Schema Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date      : 2021-10-28T15:41:39.2632075+00:00 -->
<!-- Version            : 5.0.1.702 -->
<!-- Package ID         : 12197ff389a44d70a6296bbc85e7e090 -->
<!-- Copyright (c) 2021 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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  <xsd:element id="ghm_ContractWithCustomerLiabilityConsiderationReceivable" name="ContractWithCustomerLiabilityConsiderationReceivable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="ghm_ContractWithCustomerLiabilityConsiderationReceived" name="ContractWithCustomerLiabilityConsiderationReceived" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="ghm_ContractWithCustomerReceivablesBilledButNotPaidUnderRetainage" name="ContractWithCustomerReceivablesBilledButNotPaidUnderRetainage" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="ghm_HeldToMaturitySecuritiesOriginalMaturityPeriod" name="HeldToMaturitySecuritiesOriginalMaturityPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="ghm_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesRemainingAvailableForGrant2000Plan" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesRemainingAvailableForGrant2000Plan" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="ghm_TwoThousandIncentivePlanMember" name="TwoThousandIncentivePlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ghm_StockCompensationPriorPlanMember" name="StockCompensationPriorPlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ghm_PerformanceVestedRestrictedStockMember" name="PerformanceVestedRestrictedStockMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ghm_TimeVestedRestrictedStockMember" name="TimeVestedRestrictedStockMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ghm_OfficersAndKeyEmployeesMember" name="OfficersAndKeyEmployeesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ghm_EmployeeStockPurchasePlanMember" name="EmployeeStockPurchasePlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ghm_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumDiscountFromMarketPrice" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumDiscountFromMarketPrice" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="ghm_ShareBasedCompensationArrangementByShareBasedPaymentAwardCommonStockAuthorizedForPurchase" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardCommonStockAuthorizedForPurchase" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="ghm_NumeratorAbstract" name="NumeratorAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ghm_DenominatorAbstract" name="DenominatorAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ghm_NumeratorDilutedIncomeAbstract" name="NumeratorDilutedIncomeAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ghm_DenominatorDilutedIncomeAbstract" name="DenominatorDilutedIncomeAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ghm_SummaryOfBasicAndDilutedEarningsPerShareAbstract" name="SummaryOfBasicAndDilutedEarningsPerShareAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ghm_ProductWarrantyAccrualAcquired" name="ProductWarrantyAccrualAcquired" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="ghm_ProductWarrantyIncomeExpense" name="ProductWarrantyIncomeExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="ghm_ProductWarrantyIncome" name="ProductWarrantyIncome" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="ghm_NoncashOrPartNoncashAcquisitionEquityInstrumentConsiderationValueOfTreasurySharesIssued" name="NoncashOrPartNoncashAcquisitionEquityInstrumentConsiderationValueOfTreasurySharesIssued" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="ghm_PensionAdjustmentsNetOfIncomeTax" name="PensionAdjustmentsNetOfIncomeTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="ghm_SelfInsuredMedicalPlanLiability" name="SelfInsuredMedicalPlanLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="ghm_IncomeTaxesLineItems" name="IncomeTaxesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ghm_IncomeTaxesTable" name="IncomeTaxesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ghm_AccumulatedDefinedBenefitPlansAdjustmentNetActuarialGainLossesMember" name="AccumulatedDefinedBenefitPlansAdjustmentNetActuarialGainLossesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ghm_LesseeOperatingAndFinanceLeaseRemainingTermOfContract" name="LesseeOperatingAndFinanceLeaseRemainingTermOfContract" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="ghm_LesseeOperatingLeaseAndFinanceLeaseOptionToRenewOrTerminate" name="LesseeOperatingLeaseAndFinanceLeaseOptionToRenewOrTerminate" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="ghm_LeasesLineItems" name="LeasesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ghm_LeasesTable" name="LeasesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ghm_FinanceLeaseAbstract" name="FinanceLeaseAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ghm_OperatingLeasesAbstract" name="OperatingLeasesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ghm_LetterOfCreditCommitmentFeePercentage" name="LetterOfCreditCommitmentFeePercentage" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="ghm_MaximumLeverageRatio" name="MaximumLeverageRatio" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="ghm_MinimumFixedChargeCoverageRatio" name="MinimumFixedChargeCoverageRatio" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="ghm_PercentageOfMinimumMarginedAssetsOnOutstandingFacility" name="PercentageOfMinimumMarginedAssetsOnOutstandingFacility" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="ghm_MaximumLeverageRatioUponAcquisition" name="MaximumLeverageRatioUponAcquisition" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="ghm_MaximumLeverageRatioCovenantPeriodUponClosingOfAcquisition" name="MaximumLeverageRatioCovenantPeriodUponClosingOfAcquisition" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="ghm_BloombergShortTermBankYieldIndexMember" name="BloombergShortTermBankYieldIndexMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ghm_FloorRateMember" name="FloorRateMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ghm_LetterOfCreditSecuredByCashMember" name="LetterOfCreditSecuredByCashMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ghm_FiveYearTermLoanWithBankOfAmericaMember" name="FiveYearTermLoanWithBankOfAmericaMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ghm_HSBCBankUSAMember" name="HSBCBankUSAMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ghm_LineOfCreditFee" name="LineOfCreditFee" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="ghm_OtherOperatingIncomeNetLineItems" name="OtherOperatingIncomeNetLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ghm_OtherOperatingIncomeNetTable" name="OtherOperatingIncomeNetTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="ghm_TransactionAgreementMember" name="TransactionAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
</xsd:schema>
