humming motor with no operation; my cure

[fyrfyter5]

This I think is an isolated issue but thought I would share with the forum. I had the humming motor of death with no operation. Took the belt off with same no operation. Reading the forum i thought it would be the capacitor, so i pulled off the back cover of the motor and this is what I found. Somehow the wire going to the Cap got shredded and severed. see pics. I still can not fathom how this happened...

I will replace the wire and keep u posted.

Cheers

[wa2crk]

Fyrfytr;
It appears in your second pic that the wire may have been pinched between the end cap of the motor and the frame when it was manufactured. The long groove in the insulation gives me that indication. Try to reassemble the motor carefully and sometimes the wires will want to go back to there original position and you can determine where it was pinched.
Bill V

[fyrfyter5]

The other reason I was thinking this was something flying around in the motor is that all of the glue strips around the coil are broke as well. I will see if it could have been pinched when i put it all back together.

Thanks

[JPG]

The other reason I was thinking this was something flying around in the motor is that all of the glue strips around the coil are broke as well. I will see if it could have been pinched when i put it all back together.

Thanks

Make sure the centrifugal switch(start switch) weights, springs etc. are secured and working properly!

[billmayo]

The other reason I was thinking this was something flying around in the motor is that all of the glue strips around the coil are broke as well. I will see if it could have been pinched when i put it all back together.

Thanks

The coil ties are broken from the coils being overheated. You will notice the coil wire insulation changes to a darker color where the ties are broken. This can occur if the input power is applied too long (over 2 sec) when the motor only hums and does not rotate at full speed. Your coils should be OK as very little appears to have overheated. I find I can save about 50% of the motors with this condition. This picture is of a 1 1/8 HP motor that could not be saved.
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[wa2crk]

Fyrfyter;
I looked at your pix for second time and I noticed the plastic disc that hides the centrifugal switch mechanism. If that disc rotates with the motor shaft it may be the culprit that caused the "cut" in the insulation on the wire. If the wire was lying against the disc during the years that the machine was being used It could have worn away the insulation in the pattern shown. The ends of the damaged area seem to have a polished look to them which indicates a rub of some sort.
Bill V

[fyrfyter5]

Thanks for all the input. I am up and running again. I think wa2crk got it. I think the switch mechanism got too close to a wire and cut it. i made sure all the wires were tucked well away from anything spinning.

[billmayo]

This I think is an isolated issue but thought I would share with the forum. I had the humming motor of death with no operation. Took the belt off with same no operation. Reading the forum i thought it would be the capacitor, so i pulled off the back cover of the motor and this is what I found. Somehow the wire going to the Cap got shredded and severed. see pics. I still can not fathom how this happened...

I will replace the wire and keep u posted.

Cheers

I got an Emerson motor, motor pan and switch today that pops the circuit breaker whenever it was turned on. Some one had moved the motor pan power cord strain relief about 3" down the power cord making the inside power cord leads about 3" longer. About 2" from the switch, just pass a cable tie location, both the black and white power cord wires have been rubbing on the Control Sheave to where both wires were missing a spot of insulation (bare wire showing). These bare spots on the wires ended up facing each other and semi welding a few strands together so it was not noticeable until I removed the cable tie and switch from the wires. First one I have seen in this condition. Easiest fix to a motor I have done. Shrink wrap tubing and a few additional cable ties took care of the problem.

NOTE: When replacing or installing the power wires, switch or the Speed Control Assembly, be sure the Control Sheave is not rubbing any wires or hitting the Speed Control bracket (High Speed Adjustment) when turning the quill by hand with the Speed Control Dial set to FAST (max). Use cable ties to keep the wires together along their length from motor to switch.