hitachi koki ec 89 will only pump to 110 psi

by Bill
(elk grove, ca)

hitachi koki ec 89  air compressor

hitachi koki ec 89 air compressor

compressor runs but will only pump to 110 psi, inlet is clear, check valve appears intact thus it never reaches shut off pressure. compressor is not that old it was only used to build a shed then stored. what do you think. thank you

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Oct 05, 2014
hitachi koki ec 89
by: Bill

This 4 gallon twin-stack air compressor has a normal cut out pressure of 135 PSI.

That it's only generating air up to 110 PSI and stays there, and the compressor never shuts off, suggests to me that the pump has a valve (either intake or pressure valve) problem, or - and I think this is more likely - hits 110 PSI and a gasket lets go in the pump, and the air just cycles back and forth.

See the troubleshooting page compressor will not build pressure for more information.

Bill

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