Bostitch Air Compressor Will Not Reach Cut Off Pressure – Solutions & Causes

Bostitch will not go past 100 PSI and never gets to cut off pressure

by Shawn
(Denver)

I just replace the valve head with a newer style head from the CAP60PB-OF (mine is the CAP60P-OF) due to a broken valve flap.

Now it gets to about 128lbs and stops building pressure but keeps running.

The piston ring appeared to not have excessive wear.
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Sounds as though you might have a gasket issue, Shawn.

Did you replace the gaskets when you replaced the valve plate?

If not, you likely need to. If so, you may have a crimp or weakened area that lets go when the pressure gets to the 128 PSI, and then the air just cycles back and forth in the head.

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