The first step is to remove the rotor from the motor. This is done by first removing the end bell from the motor. The end bell is held in place with three 3/32nd screws.

Once the three screws are removed, the end bell should slide off easily. If it is tight, give it a slight twist as you pull it away.

• You should note that there is an insulating piece of paper just inside the end bell. Be sure not to lose it or any of the shims that may be on the rotor shaft

Using a soft bristle brush or compressed air, carefully clean the inside of the motor being sure to remove any debris that may have found its way inside.

Never use solvents such as motor cleaners or brake cleaners.

Clean the rotor with the brush or compressed air also, paying special attention to the bearing and magnet surfaces. The rotor is highly magnetic so metal debris may be stuck to it.

Clean the front end bell housing in the same manner, paying close attention to the bearing. This is a good opportunity to check the bearing to make sure it operates smoothly.

Visually double check the interior of the motor to be sure that it is free of debris that may interfere with the rotation of the rotor.

After completely cleaning the motor, reinstall the end bell with the 3 main 3/32nd screws into the motor.

Check the endplay of the rotor. There should be approximately 0.005-0.010” of endplay. If necessary, add or remove shims from the pinion side of the motor shaft until adequate endplay is reached.

Spin the rotor in the motor to make sure that it spins without hanging up on anything that you may have missed inside the motor.