place. Before a motor is disassembled, consider the
The area for disassembly must be clean.
Tag all leads and the point of connection from
where the leads have been removed.
Wipe all excess dirt, grease, and oil from the
exterior surface with an clean cloth moistened
with an approved solvent.
Inspect all leads for burned, cracked, or
deteriorated insulation at the point of their entry
into the motor.
Turn the motor shaft by hand to determine
whether the armature turns freely. If not, inspect
the motor for a bent shaft, misalignment of the
end bells, loose or frozen bearings, a loose pole
piece, or foreign objects inside the motor.
Use gloves or a cloth to protect your hands from
the sharp edges of the keyway when turning the
End Bell Removal.When you are removing the
end bells, remember that on some motors the bearings
must be removed before the end bells. To remove the
end bells, use the following procedure:
1. Punch mark the frame and end bells for
reassembly purposes (fig. 7-56).
2. Remove the end bell fastening screws or bolts.
3. Remove the bearing first, if necessary.
4. Part the end bells from the frame, as shown in
5. Record and disconnect the leads from the
internal mechanism and components.
6. Clean the end bells and frame.
7. Inspect the disassembled parts and replace as
Bearing Removal.Sometimes you can remove
the bearings before removing the end bells. In other
cases, the bearings slip off the shafts with the end bells.
Frequently, the bearings are press fitted to the shafts and
end bells, making their removal difficult. Since bearing
removal varies with the different types of motors, only
some of the most important procedures and precautions
Never remove bearings in good condition from
the shafts or end bells unless it is absolutely
Remove all bearing attachment screws or bolts
before attempting to remove the bearings.
Remove ball bearings which are to be reused by
arbor plates and an arbor press to prevent
Remove ball bearings to be discarded with a
Figure 7-56.Punch marking motor frame and end belts.
Figure 7-57.Separating motor frame from end bells.