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craftsman air compressor wont hold over 30 psi

i have a craftsman 33 gallon air compressor model number 919.167320 and it will not hold more than 30 psi. i just replaced the compression ring and a 2 o-rings on the rod/pump assembly. there are no leaks from anywhere on the tank. the air intake seems to stop sucking air once the tank hits around 25psi. is there a wrong way to put in the comp. ring? i unscrewed the torx bolt on top of the rod and placed the ring inbetween there and tightened the top down. im lost.....

Air Compressors , Craftsman , Garage Organization & Shelving
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2 Answers from these members:
Joseph Perez
by Joseph Perez Earned 20,677 community points in Craftsman
November 30th, 2011
Answered in 3 minutes
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Manage My Life
by Manage My Life
December 1st, 2011
Answered in 18 hours
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