compair holman 125 builds air but revs hard and does not slow down

by john Joskin
(england)

it runs and builds air but revs hard and does not slow down any ideas


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Bill says...

John, the pressure switch system on your compressor is supposed to sense when the pressure in the tank reaches the normal cut out pressure level.

Since yours is a gas powered air compressor, when the pressure in the tank reaches the cut out level, rather than shutting off a motor, as happens on some electrically powered air compressors, your pressure switch signals the throttle to ease off, reducing the RPM of the gas motor. Then, when air pressure in the tank and system drops to cut in, your throttle valve should have the motor rev back up.

It seems to me that you are experiencing a problem with the pressure switch / throttle valve circuit, and that's best dealt with by a motor mechanic.

Cheers,

Bill

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