Fix grinding sound from motor

1. Remove the motor from the housing (scroll down to see assembly process and reverse the order), next remove shear key from the slot in the axle.

2. Remove the half clip

3.  Remove the 3 screws, they are tight so take care not to strip them out.

4. Slide the gear off

5. Use c-clip pliers to remove retainer

6. Place motor on a hard surface and push down on rotor housing to overcome the magnetic field.

7. It should slide down and off the shaft, note, you really have to push hard to do this.

– Careful not to lose the thrust washer

8. push on the magnets, if one slides down you know they are loose, or if it makes that grinding sound just assume they are loose. Number each magnet so you put them back in the proper order

9. With a screwdriver you can pry up the magnet to remove them

10. Safe spot to store them is on the outside of the housing, be very careful handling the magnets, they are strong and if they slip out of your hand and snap against each other or a metal object, can easily break

11. Once they all removed, clean all debris and old glue from housing and magnets. I usually give each magnet a good cleaning just before gluing it down.

12.  this one had several issues, the other being a cold solder joint on one of the halls sensors. Note the 3 in the center of the picture, the middle one is loose causing erratic running of the motor.

13. Starting the re-gluing of the magnets (using epoxy)

14. All done, note magnets are flush to the outer edge of the housing. Now to wait 24 hours for the epoxy to cure

15. Re-soldering all the halls sensor connections.

16. look out for any cold joints, that means they weren’t making proper connection.

17. Just showing how fast the stator snaps into place

18. Install snap ring
.

19.   install gear and half clip

20.   slide assembly back in housing

21. Once fitted give it a spin to insure all is well. There should be a spacer and thin washer on the shaft.

22. install cover and 6 allen screws, Note this is a spare motor housing, the reason it isn’t laced into a wheel.