Repair; Repairing The Commutator; Undercutting The Commutator - Taylor-Dunn SC-100-24 Service And Replacement Parts Manual

SC-100

REPAIR

WARNING
This section is one section of a complete service
manual. Before starting any procedure, read all
warnings and instructions that are located in the
Service Guidelines chapter.
The only recommended repair to a motor is cutting the
commutator. If any other components are damaged then
they should be replaced.

Repairing the Commutator

1: The motor must be removed from the vehicle for
this procedure. Refer to Drive Axle section for
information on removing the motor.
2: The armature must be removed from the motor
for this procedure. Refer to Motor Inspection-
Disassembly section for information on taking
the motor apart.
3: Using a lathe, cut the armature just enough to
remove all grooves, depressions or ridges.
4: Measure the diameter of the commutator. If the
commutator is less than the minimum diameter
specifiedin Service Limits, then the motor must
be replaced.
5: Thoroughly clean all copper debris from between
the commutator segments.
6: Measure the commutator undercut depth in
5-places around the commutator. If any one of
the measurements is less than the minimum
undercut depth specified in Service Limits, then
the commutator must be undercut.
7: While still in the lathe, smooth the commutator
with fine emery cloth.
Properly cut commutator
MA-100-03

Undercutting the Commutator

1: Using a small straight cut saw blade, cut the
commutator insulation to the proper depth. Refer
to undercut depth in Service Limits.
2: Once all segments have been properly undercut,
mount the armature in a lathe and smooth the
commutator with fine emery cloth.
3: Inspect the armature for shorts. Refer to Motor
Inspection section for information on testing the
armature.
Note: Copper debris in the undercut area can give
a reading of a shorted armature.
4: Inspect the armature for shorts. Refer to Motor
Inspection section for information on testing the
armature.
Note: Copper debris in the undercut area can give
a reading of a shorted armature.
Motor SEM
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