POWER OF ATTORNEY







 I, Harold A. Wagner, hereby appoint and constitute Janice M. D'Amato and David

C. Anderson, acting individually, my true and lawful attorney-in-fact with full power to

sign for me and in my name a Statement of Changes in Beneficial Ownership of

Securities issued by PACCAR Inc on Form 4 and Form 5 to be filed with the Securities

and Exchange Commission under the Securities Exchange Act of 1934, as amended,

together with any and all amendments thereto.  This power of attorney shall remain in

effect until  May, 1, 2008 unless earlier terminated by the undersigned in writing.



 IN WITNESS WHEREOF, the undersigned has executed this power of attorney

this 3rd day of December, 2007.





/Harold A. Wagner/

Harold A. Wagner