Powermate 20-gallon Compressor makes loud Clatter

I strated up my Powermate 20-gallon compressor and it immediately started making a loud clattering sound.


Could it be a gasquet around the piston?

I unplugged it. The sound was not the usually pump building up pressure.
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Hard to tell without actually hearing the sound or seeing the compressor run.

It were mine, I'd double check that everything on the compressor was secure before I started it again.

I understand you turning the air compressor off hoping to prevent damage, but if all the motor and accessory parts are tight, then turning it on is the only way to try to determine the cause.

If this were my air compressor, after making sure everything on it was tight 'cause they do vibrate quite a bit, I would turn it on and watch the tank air gauge to see if it was building pressure.

Bill

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PowerMatic Handyman - can the rubber 'ring' be replaced

by Stephen J
(Omaha)

Bought a Powermatic Handyman oilless C40C200P1D101 cheap this week. Motor is OK but pump piston is not. The rubber 'ring' on the piston is shot. So is the cylinder wall sleve. There are 2 -3/8" or so holes on top of the piston. It looks like the rubber 'ring" is glued under the top of the piston. I know it needs a sleeve but can the rubber 'ring' be replaced? Piston seems OK. thanks

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Coleman Powermate Air Compressor blows circuit breaker

by Steve
(Bloomington, MN)

Coleman Powermate oilless 27 gallon direct drive compressor:

Blows circuit breaker always when tank is full. I can fill it if the tank is empty, however, on restart it will blow the breaker.

The unloader valves appears to be working when auto shut off is reached and makes the "WHOOSH" sound.

I have changed the run and start capacitors on the motor- no help.

Is the motor windings suspect or what would you check next?
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Clearly the compressor motor is having a problem starting when there is load.

If the unloader valve is working, then the pump can start, briefly, but as soon as it starts pumping, it's driving air down into the tank against what... 80-90 PSI air that's already in there, and that's loading up the motor.

The motor should be able to handle this.

I suspect you have a starter problem - not capacitor - but perhaps a centrifugal starter circuit, so, yes, if this were my compressor, I'd be removing the motor (or taking the whole compressor) to a motor shop and ask them to thoroughly test the motor.

Cheers,

Bill

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Coleman Powermate has HOT AIR and tank hot

by John Barnes
(Mechanicsville, Va)

Air compressor works fine.

Problem the exiting air tub to the air filter to supply hose is hot and air is warm coming out the hose.

Plenty of space around unit in air conditioned garage.
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Be good to know the model John, or at least the HP and tank size.

I don't know about Virginia, but where I am has been darned hot of late.

If you are using the air compressor continuously, then the heat from the pump and motor, along with the fact that the compressor is pulling in hot, humid air, is likely contributing to this.

That is, of course, unless you are underpowering the motor which would make it run hotter than normal.

That your air compressor is not tripping off on thermal overload suggests to me that the unit is working fine, if perhaps a little too hard in hot weather.

If it is oil lubed, check the oil and make sure you drain the tank.

Bill

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