Sears 2HP-20GAL model #919.176320 starts to srtuggle

by Denny
(Grand rapids MI)

compressor starts, then when it gets to about 20 psi, the motor starts to stuggle and then trips the overload. Any ideas what might be going on? Thanks, Denny


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Bill says...

Denny, any change in the power supply? No extension cord, I hope?

The motor is struggling because it's trying to turn against a too great load, or the motor itself is wearing out, or a capacitor is failing.

If you can rule out any obvious mechanical issues, and the compressor is getting clean power, it may be time to test the motor and capacitor(s).

Cheers,

Bill

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Aug 30, 2011
compressor struggling
by: Denny

Bill, how would I go about checking the motor and capacitors? Thanks, Denny

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For the motor, do an amp test to see how many amps it is drawing as the tank fills up. You need to know the motor specs so that you can determine if the amp draw is outside of normal ranges.

Sorry, no info from me on checking a capacitor. I'm still trying to find a system that I can pass on, and haven't been able to find one yet.


b.

Aug 30, 2011
motor struggling
by: Denny

Thanks Bill! no extension cord, motor runs fine without any load, do you think it could be the check valve? (back pressure against the head?)

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Absolutely no problem dumping the air, and checking the tank check valve to see if it is somehow not allowing compressed air to enter the tank.

By the same token, the tank pressure, as it increases, will make the check valve harder to open. This is normal, and should not cause a problem for a compressed air system that is working optimally.


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How do you replace the flappers on an air compressor?

Schematic compressor # 106171941

Schematic compressor # 106171941

I have an air compressor model number 106171941 and there seems to be blow back and it seems the flappers are riveted? How can I go about replacing them?

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Bill says...

According to the Sears parts division, and the parts schematic for your compressor that I have uploaded from their site, the valves are part #9 & #10.

If they are riveted onto the valve plate, you will have to drill out the rivet, and then rivet on the new ones.

Cheers,

Bill



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