Will not build pressure past 40 psi

by joseph
(allentown pa usa)

harbor freight central pneumatic 2.5 21 gal vertical oil gray in color will not build pressure past 40 psi

2 valves thin strips of metal on valve plate 1 is 1 piece the other same size but in 2 halves over lapping not sure this is right

cylinder to crankcase put some oil there when I took it apart gasket soaked with the oil not sure if this is the same problem or other

compressor is 2 years old

Comments for Will not build pressure past 40 psi

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Sep 02, 2016
No pressure past 40 PSI
by: Bill

It is a common problem, and well explained in the troubleshooting section. Please follow the steps outlined, and as Doug requests, be as specific as you can about the findings on your Central Pneumatic compressor.

Sep 01, 2016
by: Doug in s.d.ca

We have yet to see "this problem" well-defined.

What's yours?

Sep 01, 2016
No pressure past 40 pounds
by: Anonymous

I have the same CP 21 gal. compressor. Purchased in October, ran until it got cold. Kicked breakers and wouldn't run below 40 degrees from Dec. until March. Ran fine in warm weather for three month after. Quit working right in June. It sounds louder and won't build pressure past 40 pounds. Did anyone else solve this [problem?

Jul 25, 2016
Pressure build stops at 40
by: Anonymous

Same problem, same compressor, find a solution?

(See troubleshooting page: https://www.about-air-compressors.com/compressor-will-not-build-pressure.html - Moderator)

Jan 25, 2016
Low pressure??
by: Doug in s.d.ca

Need to start with basics. See the troubleshooting on why compressors don't build pressure, and describe the nature of the no-build endpoint.

Also, a model number and some pix of your question areas would help.

(And no, overlapping pieces of valves is probably not the correct configuration. A valve plate would help I suspect. B.)

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