1.5 hp compressor will not start with any pressure on it. why?

by Larry Honse

My 1.5 hp Sears air compressor will not start with any pressure on it

Hello Larry...

Could be a number of reasons for this to happen.

One of the commonest is that the unloader valve has not released the pressure over the piston when the compressor last stopped.

You can check this by opening your tank drain and draining all the tank pressure. Close the drain and try to start the air compressor.

If it does start and runs up to normal cut out, make sure that you monitor the unloader valve to be sure it is working.

If you want to know more about the Unloader Valve, see that page linked from the sitemap page under valves.


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