919-16523 starts slow, then trips 20amp breaker

by Ken Walker
(Tulsa, Oklahoma, USA)

This compressor is operating on 120v. When I purchased the compressor, the gentleman plugged it in and it ran nicely, except for the nipple between the tank and the pressure switch was cracked.


I get the compressor home and take it apart to extract the broken 1/4" x 2.5" nipple and replace it. I put it back together to go ahead and test it for leaks and the motor turns slow and quiet for about 3 - 4 seconds (not even long enough to register a pressure change on the guage) and trips my 20amp breaker. I've looked at all the wires I disconnected and rechecked every step and everything seems to be in order, so I don't understand why it would just stop working.

I'm completely stumped any help you could send my way would be greatly appreciated Bill.

Ken
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Ken, if there is air in the tank, bleed it down to zero and try again.

If you are using an extension cord, plug the compressor cord directly into the socket and see if this makes a difference.

Did it?

Bill

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craftsman oil type compressor building up pressure in crank case

by Bill
(Katy, Texas)

craftsman oil type compressor building up pressure in crank case which blows dust cover off bearing.

I have a craftsman oil type compressor that is rated at 150 PSI It will pump up to 150, but seems to get very hot.

Before it stops, the pressure inside the compressor pump blows the dust cover off the bearing on the side of the unit. This indicates that a lot of pressure is building up in the compressor crankcase. What will cause this?
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Howdy Bill.

Typical cause of this problem is badly worn piston seals.

Air is blowing by the piston and into the oil sump instead of being pushed into the tank.

This means your air compressor is running longer to get the tank pressure up to the cut out pressure setting, and that could lead to the motor overheating.

Time for a piston seal kit I think.

Cheers,

Bill

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