Jerry Trumball wrote:
I have a GE DDE7208 dryer with a 5KH26JJ motor. When the motor is
stationary, the centrifugal switch energizes the start winding along
with the run winding. When I depress the starter, the motor hums but
does not turn even with the belt off. That points to a bad motor, but I
want to be sure.

Winding resistances are 3 and 4 ohms. That doesn't prove the insulation
is holding up at 120 VAC, but if there were a leak so bad that the motor
wouldn't turn even unloaded, wouldn't the overload protector break the
circuit?

At 2 amps DC, there are only 6 mv across the centrifugal switch, so the
contacts appear to be fine.

Bearings have no slop or noise but more friction than some motors I've
seen. It takes 0.7 inch-pounds to get the shaft moving.

What could be wrong?

My experience with motors is that under normal operation windings don't
fail. Usually the problem is with the "stuff" surrounding the
magnetics. Switches, capacitors, bearings, clutches, etc. Make sure
everything is clean and lubricated. The motor may not have much
starting torque so compromised bearings mare be a problem. Can you
safely give the motor a bit of help when starting to verify or rule this
out?

Boden