The first step is to remove the old 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

Once the rotor is removed, inspect the inside of the motor for any shims, spacers or any damage that might have occurred from removing the rotor.

Next, remove both rubber end caps and slide the sintered rotor from the tube that it is shipped in.
         
Slide the tube into the motor carefully using a slow twisting motion if necessary.

Next, while holding the pinion side of the rotor with a pair of needle-nose pliers, gently lower the rotor into the motor.

Then, take one of the shims that came with the rotor and slide it over the motor shaft.

Next, replace the end bell with the insulator paper in it and carefully line it up properly with the rest of the motor. At this point, you can put the screws through the end bell as well.

Next, 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 inside the motor. You should notice that the new rotor has more of a notchy feel than the original.