921.153101 only builds pressure to 40#

by Gary
(Wellsboro, Pa. )

Compressor quickly builds to 40 lbs. pressure, then holds there. Motor continues to run, but builds no more pressure.

Seems to be overheating somewhat if left to run.

Is there a blockage somewhere? Last used it two weeks ago, and worked flawlessly. Today, problems.

I have noted over the last month that if I left air in the tank without draining it, it was empty the next time I went to use it.

Today, there was 40 lbs pressure showing on the gauge before I turned it on. When it built no more pressure upon starting, I purged the air from the tank via the valve, and restarted.

Went to 40 pounds, then held.

No additional pressure could be generated. Suggestions on where to start?

Comments for 921.153101 only builds pressure to 40#

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Aug 13, 2018
Craftsman compressor 921.153101 only builds pressure
by: Bill

Sure, lots of folks have this problem, which is why this page is linked from the troubleshooting page on this site:


Have a look, do the checks, and add a comment with what you found if you would.

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