Pressure will not build beyond 20 PSI

by Kim
(Tulsa, OK)

I have a JobSmart® 3/4 HP, 4 Gallon Oil-Free Pancake Air Compressor Model number TAW 1516P that was given to me still in the box and apparently unused. I do not have a manual for it. It does not build pressure beyond 20 PSI. The safety valve does not leak and the drain valve is closed. Since the unit is encased (and I don't have a manual), I have not taken it apart to check anything further. I don't see any other posts about this particular model so am hoping someone can help.

Comments for Pressure will not build beyond 20 PSI

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Jul 22, 2015
by: Bill

The troubleshooting section on this website provides lots of information and things to check about problems common to many types of air compressors, including ones that don't build pressure.

Jul 22, 2015
Low pressure
by: Doug in

Assuming you've already been thru the troubleshooting steps, I'm afraid you're gonna have to pull the head.

I suspect you'll find a cracked o-ring (piston ring).

The ring isn't generally available, apparently, so if that's the problem you can either give up, or try to find a suitable replacement from an o-ring seller.

Good luck and please let us know what happens.

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