919.175260 - only reach 30PSI before tripping motor

by Jay
(San Jose, California, USA)

919.175260 - Craftsman 6HP 60gal Upright Compressor can only reach 30PSI before tripping motor reset switch


I have replaced the pressure switch, both capacitors, and the check valve on my Craftsman 6hp 60 gal upright compressor model no. 919.175260 and it still has the same poor performance issues that it had before I replace the above mentioned components.
My question to you Bill is what else could be causing this compressor to run so poorly?

Regards,
Jay
___________________
Jay, when a motor bogs down, it is because it cannot overcome the load. When it is the reset that is tripped, it is typically heat related, meaning that the motor is over heating.

The load might be acceptable for a motor in good working condition, but if the motor is failing, that's one cause for a motor to heat up and go off on thermal. Consider a load test on your motor.

Is the intake filter clean?

Has the power supply changed in any way?

Cheers,

Bill


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Jun 11, 2012
Response to Bill's Response
by: Jay

Hi Bill,

I did replace the air filter and the power supply is still the same. How do I load test the motor?
I did notice that when the reset switch is depressed it stays down and doesn't pop back-out like it should so I'm going to investigate(bypass) the reset switch to see if that's the problem.

Jay

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Craftsman 3HP/15G Compressor cycling on and off while filling

by Ryan
(Detroit, MI)

My 5 year old compressor cycles on and off while initially filling the tank. There doesn't seem to be a pattern. It may fill to around 60 PSI and then begins to cut on and off by itself until maxing out at 140 psi. It may run for 10 seconds stop for 5, start for 3 stop for 2, start for 20 etc. Eventually it fills but something is definately wrong. It seemed to always do this in hot weather but now it's happening more frequently and even on colder days.

One more thing...there is a slight leak somewhere that will drop the pressure about 10 psi overnight...but I'm not to worried about that as I only plug it in when I use it. Just not sure if that information is helpful in troubleshooting the cycling issue. Any ideas? Thanks.

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Bill says...

Ryan, the cycling on and off is symptomatic of the pressure switch malfunctioning. They are an electro-mechanical device, and, over time, they do fail.

Does this.. "while initially filling the tank" mean that this only happens on the first fill, or does the compressor cycle on and off every time it's running?

The slight leak may be that the tank check valve isn't seating properly or has some debris lodged in it, and air is slowly bleeding out the unloader valve, which is open when the air compressor is off. If it only happens overnight, then it's hardly worth the effort to fix it now, but, if the leakage gets worse, that's where I would look first.

Cheers,

Bill



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