I have a Kenmore Series 400 model 110.2742260. It fills with water then just hums. Drained the unit pulled the pump and motor assembly out. Put lid switch back in place. With motor on floor put machine in wash cycle and have humming sound from timer and motor does not spin even if I try to spin the shaft by hand. Put machine in spin cycle and motor hums, if I spin the pump shaft of the motor(I have the pump off) it will then turn and spin the gearbox and tub shaft. Any ideas?