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i can answer that. here's the answer.

any heating and cooling supply facility.

just show them what you have and they will sell you a replacement.it's a pretty standard thing and doesn't cost much either.

Hello all,

I too recently came across a the same problem with that model compressor.

I was told it just needed a start capacitor. So I searched for parts and manuals and came across your topic here.

I have reached a stumbling block because mine too has 2 capacitors, one mounted on the outer center of the frame (1) and another behind the motor gaurd (2).

The number 1 capacitor is missing so I do not know the size of it so i can find a replacement.

The second threw me completely as the A o smith motor(d23360) is rated at 115 volts, The capacitor is 136-163 mfd, 220 vac 60hz mallory with a blue resistor terminated across 2 of the 4 terminals.

I placed a replacement 4cu32 (400-488mfd, 165vac) on the top frame (1) and

the motor makes a loud humming sound then trips the breaker.

Does anyone have the same type compressor in working condition that could give me details on the values of each of the capasitors please.

If anyone could shed some light on this matter, I would be extremly grateful

TIM

The Capacitor you installed is another start capacitor. This is why the motor is not running. You need to install a Run Capacitor. The start capacitor is the one attached to the rear of the motor inside the back cover. It's value is the one you have a 136-163 MFD 220 VAC.

The one you need to get is the run capacitor and it is installed under the cover on top of the motor. Its value is 30 uF 370 VAC. Put those both into the correct places and the motor should run OK.

I have this same cap, a Cambridge M40F30 and wonder why there are 3 wires. Two red and one brown. Why would it have 2 wires on what I think is the + side and one brown wire?

Just fixed my compressor. It would start ok when the tank was empty but trip the breaker if it tried to start with pressure. Searched and read about weak caps, or problem with check valve or pressure switch leaving pressure in the pump head, etc. Turned out that the black plastic box which holds the 2 start up caps and is attached to the end of the motor with 2 screws had cracked on the bottom. The black box had tilted out enough that the start up caps switch was not engaging. Pushed on the lower part of the box and it started perfectly. Fixed it for the cost of some 2 part epoxy. Maybe not your fail, but definitely worth checking out first.

my compressor won't Restart when pressure drops. the motor turns real slow

my compressor won't Restart when pressure drops. the motor turns real slow

It's called the unloader valve. If you don't hear that short hiss when the motor stops then that's what it is.

My compressor blows the breaker periodically when it's full of air and is restarting. If I plug it into an extension cord it works fine. The circuits are fine, been completely tested with other items. The unloader valve is working (I hear the hiss when it is full of air and the motor starts). I replace one of the capacitors years ago. One is white and one is black, not sure which one is the run capacitor and which is the start capacitor. Does it sound like the start capacitor could be bad? And since Sears doesn't sell parts for this anymore, would a place like granger have them? THANKS!