When should I replace my electric motor brushes?
If the tester doesn’t light or buzz, or if it flickers or stutters when you turn the motor shaft, the brushes should be replaced. If the springs behind the brushes are damaged, they should be replaced as well. Step 3: Replace worn carbon brushes and damaged springs with new ones made specifically for the motor.
Do you have to remove starter motor to replace brush?
Most starter motors have to be removed and partly dismantled (See Stripping the starter motor ) to inspect or replace brushes. However, some have a removable band which lets you check at least two of the brushes with the motor in place. On a few, you can replace brushes with the motor in place, through a hole in the side of the endplate.
Can a brush be replaced on an inertia starter?
On all inertia starters with face-type commutators, brushes can be replaced without removing the armature/commutator. On a pre-engaged starter, the built-in solenoid is removed (See Stripping the starter motor).
What to do if your starter brush is discoloured?
If the commutator stays discoloured, clean it with very fine glasspaper. If the surface is badly worn, buy a new or exchange starter. Unscrew and pull out the two long bolts to release the endplate; pull out the armature. Undo two screws to release the brush assembly. Pull out the brush assembly.
How are the brushes attached to a commutator starter?
Release the springs so that they push the brushes down into contact with the commutator. Put the endplate back on to the motor, and reattach it by the two long slot-headed bolts. On face-type commutator starters there are two ways of fastening on the endplate, under which the brush assembly is housed.
How do you remove brush from starter motor?
Lever off the spring clip with a screwdriver, taking care not to damage the end of the shaft. The clip is usually circular, with a toothed or serrated edge, and may be hidden under a rubber cover. Discard the clip. Remove the two long, slot-headed bolts which hold the motor together. Lift off the end to expose the brush assembly and commutator.
If the commutator stays discoloured, clean it with very fine glasspaper. If the surface is badly worn, buy a new or exchange starter. Unscrew and pull out the two long bolts to release the endplate; pull out the armature. Undo two screws to release the brush assembly. Pull out the brush assembly.
What’s the best way to repair a starter motor?
Make sure the bolts all line up and then the brushes can be pushed in properly so the springs are pushing down on them. The back plate or brush cover can go on next and the long bolts inserted and done up finger tight. Put one screw into the brush holder to make sure everything is lined up and tighten it all up. Make sure the armature turns freely.
On all inertia starters with face-type commutators, brushes can be replaced without removing the armature/commutator. On a pre-engaged starter, the built-in solenoid is removed (See Stripping the starter motor).