-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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<SEC-DOCUMENT>0000075362-08-000024.txt : 20080114
<SEC-HEADER>0000075362-08-000024.hdr.sgml : 20080114
<ACCEPTANCE-DATETIME>20080114194510
ACCESSION NUMBER:		0000075362-08-000024
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20080111
FILED AS OF DATE:		20080114
DATE AS OF CHANGE:		20080114

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PACCAR INC
		CENTRAL INDEX KEY:			0000075362
		STANDARD INDUSTRIAL CLASSIFICATION:	MOTOR VEHICLES & PASSENGER CAR BODIES [3711]
		IRS NUMBER:				910351110
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		PACCAR BUILDING
		STREET 2:		777 106TH AVENUE NE
		CITY:			BELLEVUE
		STATE:			WA
		ZIP:			98004
		BUSINESS PHONE:		425 468 7383

	MAIL ADDRESS:	
		STREET 1:		PACCAR BUILDING
		STREET 2:		777 106TH AVENUE NE
		CITY:			BELLEVUE
		STATE:			WA
		ZIP:			98004

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	PACIFIC CAR & FOUNDRY CO
		DATE OF NAME CHANGE:	19720707

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			TEMBREULL MICHAEL A
		CENTRAL INDEX KEY:			0001191932

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-14817
		FILM NUMBER:		08529721

	BUSINESS ADDRESS:	
		STREET 1:		PACCAR INC
		STREET 2:		P.O. BOX 1518
		CITY:			BELLEVUE
		STATE:			WA
		ZIP:			98009
</SEC-HEADER>
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        <issuerName>PACCAR INC</issuerName>
        <issuerTradingSymbol>PCAR</issuerTradingSymbol>
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            <rptOwnerName>TEMBREULL MICHAEL A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
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            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BELLEVUE</rptOwnerCity>
            <rptOwnerState>WA</rptOwnerState>
            <rptOwnerZipCode>98004</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>VICE CHAIRMAN</officerTitle>
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            <securityTitle>
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                <footnoteId id="F7"/>
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            <exerciseDate>
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            <expirationDate>
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            <underlyingSecurity>
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            <exerciseDate>
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                <sharesOwnedFollowingTransaction>
                    <value>78988.27</value>
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                <directOrIndirectOwnership>
                    <value>D</value>
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                <natureOfOwnership>
                    <value></value>
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        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>COMMON STOCK (DICP)</value>
                <footnoteId id="F9"/>
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            <conversionOrExercisePrice>
                <footnoteId id="F9"/>
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            <exerciseDate>
                <footnoteId id="F9"/>
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                <footnoteId id="F9"/>
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                <underlyingSecurityTitle>
                    <value>COMMON STOCK</value>
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                    <value>1012.96</value>
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                <sharesOwnedFollowingTransaction>
                    <value>52775.1</value>
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                <directOrIndirectOwnership>
                    <value>D</value>
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    <footnotes>
        <footnote id="F1">Interest on funds held in SIP pending investment in shares reinvested in shares October 17, 2007.  (SIP information based on most recent report from SIP trustee - received January 11, 2008).</footnote>
        <footnote id="F2">Interest on funds held in SIP pending investment in shares reinvested in shares November 16, 2007.  (SIP information based on most recent report from SIP trustee - received January 11, 2008).</footnote>
        <footnote id="F3">December 5, 2007 dividend on PACCAR Savings Investment Plan (SIP) shares reinvested pursuant to SIP.  (SIP information based on most recent report from SIP trustee - received January 11, 2008).</footnote>
        <footnote id="F4">Interest on funds held in SIP pending investment in shares reinvested in shares December 12/18/2007.  (SIP information based on most recent report from SIP trustee - received January 11, 2008).</footnote>
        <footnote id="F5">January 7, 2008 dividend on SIP shares reinvested pursuant to SIP.</footnote>
        <footnote id="F6">Shares awarded January 10, 2008 under SIP.  (SIP information based on most recent report from SIP trustee - received January 11, 2008).</footnote>
        <footnote id="F7">Option to buy awarded under PACCAR Long Term Incentive Plan (LTIP)</footnote>
        <footnote id="F8">Share units held in deferred phantom stock account under LTIP convertible to common stock on a one-for-one basis upon satisfaction of all applicable vesting conditions.</footnote>
        <footnote id="F9">Share units held in deferred phantom stock account under PACCAR Deferred Incentive Compensation Plan (DICP) convertible to common stock on a one-for-one basis upon satisfaction of all applicable vesting conditions.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Michael A. Tembreull By Dave Anderson, Attorney of Record</signatureName>
        <signatureDate>2008-01-14</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----