Upright SL20 Series, Service & Parts Manual

Page: 47 / 104

Page 3-25
Maintenance - 3.21 - Electric Motor
SL20
I
NSPECTION
Once the motor has been disassembled, go through the following check list steps to determine
where the problem lies.
1. Bearings should spin smoothly and easily, have ample lubrication, and be free of corrosion.
2. Armature should be checked for grounds and shorted turns. Refinish the commutator sur-
face if it is pitted or excessively worn.
NOTE:
Brushes should be
checked for wear and to ensure
that they are free in the brush
holders; observe how the
brushes are assembled in the
brush holders, and the position
of the brush lead. New brushes
must be installed in the same
manner.
3. Brushes should be removed as follows:
a. Remove the brush spring clip from its mounting on the brush assembly.
b. Lift the brush assembly from the brush holder.
c. Disconnect the brush assembly lead.
d. Install the new brush assembly by reversing the above procedure.
4. Inspect the wire harness and all the connections for signs of damage due to overheating.
5. Check the stator to see it is securely mounted.