Quincy 350 just rebuilt and not building good pressure.

by Troy
(Indiana)

I am working on a Quincy 350 on a mobile service truck. It is powered by a Wisconsin engine. I have just went through the whole compressor(rings, gaskets, valve discs, springs, ect..)

The compressor sounds good, but builds pressure very slowly and it only builds 85-100 psi. and then continues to run but will not build any higher.

I can load/unload manually. I have rechecked the valve discs for debris and they look real clean. I took the unloaders off and ran it and it still had the same results, however, ther was very little air coming from the low pressure side and a high volume of air coming from the high pressure side where the unloader screws on. Any help would be greatly appreciated.

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Bill says....

What was the condition of the gaskets?

Anyone else had experience with this type of Quincy air compressor?

Cheers,

Bill