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Air compressor motor question #7725973
11/24/22 12:07 PM
11/24/22 12:07 PM
Joined: Dec 2006
Posts: 2,135
Western Michigan
Animals Only Offline OP
trapper
Animals Only  Offline OP
trapper

Joined: Dec 2006
Posts: 2,135
Western Michigan
So my air compressor quit working. I replaced both capacitors and it won't kick on. The motor will turn a very slowly then trip a breaker. I opened the motor up and found a thermal switch inside. I don't think that is the problem. The motor windings are not burnt and the bearings are free. Anyone know what might be wrong with it?


AKA: Rusty Shackleford
Re: Air compressor motor question [Re: Animals Only] #7725980
11/24/22 12:14 PM
11/24/22 12:14 PM
Joined: Jul 2009
Posts: 2,232
Oregon
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H2ORat Offline
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H2ORat  Offline
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Joined: Jul 2009
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Oregon
typically inside the back plate (end bell) of the motor is a centrifical switch that applies power to the start windings until it is up to speed -- sometimes easy to reaplace -- sometimes throw the motor.

Re: Air compressor motor question [Re: Animals Only] #7726038
11/24/22 01:13 PM
11/24/22 01:13 PM
Joined: Dec 2006
Posts: 2,135
Western Michigan
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Animals Only  Offline OP
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Joined: Dec 2006
Posts: 2,135
Western Michigan
H2ORat. Here is s picture of that bell your talking about. I circled a cluster of contacts on the back of the electric board. Is this what your talking about? They are a little corroded. I intend to clean them up. Tomorrow I'll reassemble the motor a turn it on without connecting the the air lines. Hopefully the motor will run. If it does then I'll know the problem lies in the circuit board.

[Linked Image]


AKA: Rusty Shackleford
Re: Air compressor motor question [Re: Animals Only] #7726039
11/24/22 01:15 PM
11/24/22 01:15 PM
Joined: Mar 2007
Posts: 34,058
McGrath, AK
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white17 Offline

"General (Mr.Sunshine) Washington"
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McGrath, AK
Mine will do that once in a while. Drain all the pressure off the tanks. That usually gets mine to fire up. Also, if it's cold or has an extension cord ahead of it, mine doesn't want to start.


Mean As Nails
Re: Air compressor motor question [Re: Animals Only] #7726044
11/24/22 01:32 PM
11/24/22 01:32 PM
Joined: Jul 2009
Posts: 2,232
Oregon
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H2ORat Offline
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Oregon
Yep that is the switch -- definately start it with no load first then put the berlt back on.

Re: Air compressor motor question [Re: Animals Only] #7726080
11/24/22 02:49 PM
11/24/22 02:49 PM
Joined: Feb 2008
Posts: 970
WI
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BvrRetriever Offline
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Posts: 970
WI
If the thermal switch was bad, it wouldn’t do anything. Saw motors need a good blow job once in a while. Sometimes that’s all it takes. Take off the end bell and blow out the windings/switches etc…just fyi sometimes capacitors can check good and be bad.

Re: Air compressor motor question [Re: Animals Only] #7726264
11/24/22 07:22 PM
11/24/22 07:22 PM
Joined: Dec 2006
Posts: 2,135
Western Michigan
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Western Michigan
Thanks everyone for the information.


AKA: Rusty Shackleford
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