-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 HG10c4HD24tlkUerSW9k5bRChnUSawgRC++pNy5hKm10w1UK8pZe0nBqBAVZgGvp
 AJ7H7z/vY5sL80QmxIEFrQ==

<SEC-DOCUMENT>0000897101-03-000855.txt : 20030729
<SEC-HEADER>0000897101-03-000855.hdr.sgml : 20030729
<ACCEPTANCE-DATETIME>20030729173507
ACCESSION NUMBER:		0000897101-03-000855
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20030729
FILED AS OF DATE:		20030729

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			DONALDSON CO INC
		CENTRAL INDEX KEY:			0000029644
		STANDARD INDUSTRIAL CLASSIFICATION:	INDUSTRIAL & COMMERCIAL FANS & BLOWERS & AIR PURIFYING EQUIP [3564]
		IRS NUMBER:				410222640
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0731

	BUSINESS ADDRESS:	
		STREET 1:		1400 W. 94TH ST.
		CITY:			MINNEAPOLIS
		STATE:			MN
		ZIP:			55431
		BUSINESS PHONE:		6128873131

	MAIL ADDRESS:	
		STREET 1:		1400 W 94TH STREET
		CITY:			MINNEAPOLIS
		STATE:			MN
		ZIP:			55431

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			WIEHOFF JOHN
		CENTRAL INDEX KEY:			0001241113

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-07891
		FILM NUMBER:		03809552

	BUSINESS ADDRESS:	
		STREET 1:		8100 MITCHELL ROAD
		STREET 2:		SUITE 200
		CITY:			EDEN PRAIRIE
		STATE:			MN
		ZIP:			55344
		BUSINESS PHONE:		9529378500
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>wiehoff_dci.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0201</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2003-07-29</periodOfReport>


    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>

        <issuerCik>0000029644</issuerCik>
        <issuerName>DONALDSON CO INC</issuerName>
        <issuerTradingSymbol>DCI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001241113</rptOwnerCik>
            <rptOwnerName>WIEHOFF JOHN</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1></rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity></rptOwnerCity>
            <rptOwnerState></rptOwnerState>
            <rptOwnerZipCode></rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>


        </reportingOwnerRelationship>
    </reportingOwner>


	<nonDerivativeTable>
		<nonDerivativeHolding>
			<securityTitle>
				<value>Common Stock</value>
			</securityTitle>
			<postTransactionAmounts>
				<sharesOwnedFollowingTransaction>
					<value>0</value>
				</sharesOwnedFollowingTransaction>
			</postTransactionAmounts>
			<ownershipNature>
				<directOrIndirectOwnership>
					<value>D</value>
				</directOrIndirectOwnership>
			</ownershipNature>
		</nonDerivativeHolding>

	</nonDerivativeTable>


    <ownerSignature>
        <signatureName>John Wiehoff     /s/ Norman C. Linnell by Power of Attorney</signatureName>
        <signatureDate>2003-07-29</signatureDate>
    </ownerSignature>

</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>3
<FILENAME>wiehoff_poa.txt
<DESCRIPTION>POWER OF ATTORNEY
<TEXT>

                                POWER OF ATTORNEY



         KNOW ALL PERSONS BY THESE PRESENTS, that I, John P. Wiehoff, hereby
constitute and appoint Norman C. Linnell, Amy C. Becker and William M. Cook, and
each of them, my true and lawful attorneys-in-fact and agents, each acting
alone, with full powers of substitution and resubstitution, for me and in my
name, place and stead, to sign any reports on Form 3 (Initial Statement of
Beneficial Ownership of Securities), Form 4 (Statement of Changes in Beneficial
Ownership of Securities) and Form 5 (Annual Statement of Changes in Beneficial
Ownership) relating to transactions by me in Common Stock or other securities of
Donaldson Company, Inc., and all amendments thereto, and to file the same, with
the Securities and Exchange Commission and the New York Stock Exchange, Inc.,
granting unto said attorneys-in-fact and agents, and each of them, or their
substitutes, full power and authority to do and perform each and every act and
thing requisite or necessary to be done, as fully to all intents and purposes as
I might or could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents, and each of them, or their substitutes, may
lawfully do or cause to be done by virtue hereof. This Power of Attorney shall
be effective until such time as I deliver a written revocation thereof to the
above-named attorneys-in-fact and agents.


Dated:  July 25, 2003



                                                             /s/ John P. Wiehoff
                                                             -------------------
                                                             (signature)
                                                             John P. Wiehoff

</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----
