Level of DifficultyEasy
Time to do repair1- 2 hours
Age of Appliance5 - 10 years
I found that I replaced more parts than I needed to fix fhis problem. The source of the rumble was the blower wheel connection to the motor, allowing the wheel to wobble (plastic wheel flat spot worn off over time, no firm lock to the motor shaft). But the dryer should be good for another 10 years!
Disconnect dryer from electrical outlet and exhaust.
Remove the back access plate to release the belt from the pulley. Remove the two screws at the bottom front of the dryer, rotate the front to release it at the top. Remove the wires from the door status switch. Remove the 4 nuts holding the drum support frame and pull straight out. Remove the drum. Remove the two bolts holding the thermostat cover (silver odd shaped metal plate at the front of the dryer). Remove the dryer blower cover plate by removing the 6 bolts holding it to the blower housing. Remember to remove the bolt holding the plate to the bottom of the dryer. Release the door status wire from the clips on the left side of the dryer and set the blower housing plate to the right, out of your way without removing the wires. Remove the blower wheel by removing the Circlip at the front of the shaft and then removing the shaft compression clip. Pull out the blower wheel and then remove the rear Circlip from the motor shaft. The back of the blower housing can be removed by removing the 4 bolts holding it to the motor support frame to make access easier but this may not be necessary. Release the 5 wires attached to the motor. Release the front and back motor clips. I used a large straightblade scerwdriver to press down and out on the end of the clips. Lift out the motor. Remove the rear pulley from the motor using an allen wrench and transfer it to the new motor. Set the new motor in the support frame, ensuring the lips of the vibration isolation rings are pointed down to slip over the frame and are not facing up towards the clips ( makes clip instalaltion much easier). Hook up the wires, following the color coding on the motor controller you are attaching to. Reinstall the blower back housing if removed, rear circlip, blower wheel, front circlip, shaft compression clip, blower housing front cover (Including the bolt to the dryer bottom) , reroute the door switch wire up the left side, reinstall the thermostat cover, reinstall the drum and belt, reinstall the drum front support frame (ensure the felt seals for the drum and the blower cover are properly aligned and seated correctly), hook up the door status wire when your set the front cover and install the 2 screws, reinstall the belt through the pulley and idler wheel (make sure the belt smooth side is against the drum) through the back access panel and reinstall the panel.