Sudden drop in motor speed on 919.165080
by Big Al
(Berkshire County, MA USA)
Sudden drop in motor speed while running, electrical cutout
I've had a Model 919.165080 compressor for about 15 years, never much of a problem. The other day, I turned it on, and while it was running, suddenly the engine speed dropped, as if the motor had just taken on more of a load (the pitch reduced as well), and then seconds later, the motor stopped running, it turns out because of an electrical circuit breaker.
I reset the breaker once or twice, and the motor still turns over, but seems to struggle doing so, and I believe is drawing heavy load at these times.
I took off the plastic cover over the electrical motor, and found that the plastic flywheel and piston turn over easily. There doesn't appear to be any resistance there. There are a pair of capacitors in front of the motor. One of them is somewhat browned, the other is (Painted?) black.
Any tips on what might be causing this problem, and what is needed to fix it, would be most appreciated. Thank you.