Piston stops pumping but motor doesn't stop...burned belt
I have an oiless 33 gallon compressor not more than 2 years old and only used sparingly so far.
The other day I noticed it smelled of burnt rubber so I removed the cowling to inspect. The belt had several burned/melted spots and dry rubber shavings around the flywheel.
I turned it on to see what was going on...initially all is well but after the piston pumps for ten times, it stops. However, the electric motor continues to spin which creates the burn spots on the belt. The tank is not even close to being filled to max when this happens...in fact, it was below 60 psi. Any ideas??
Brian, when I first started reading your post, I thought you might have a pressure switch problem. But then I read that the motor keeps running, it's the pump that stops. If the pressure switch shut off the compressor prematurely, it would, too, have cut the power to the motor as well and the motor should have stopped.
I don't know how you can count that the pump has cycled 10 times, as they pump pretty quickly.
Regardless, I surmise that you have a heat related problem, and that might be seizing of the pump.
I can think of no other condition where you would get intermittent seizing of the pump.
It would be confirmation to know that you had to wait for the pump to cool down before it would run again, even for that 10 count.
921.166360 runs for short bursts 3-5 seconds then shuts down
runs for short bursts 3-5 seconds then shuts down - won't build pressure
Mike, make sure that you have clean power to the compressor. If power is siphoned off to other appliances when the air compressor is trying to run, this could cause this issue.
Assuming you have clean power, drain the tank to zero PSI. Will it start and run now?
Assuming it does not, when it cycles, is the pressure switch turning power on and off to the motor or, when it goes off, is the power to the motor still flowing?
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