Taylor-Dunn C0-425-48, Service And Replacement Parts Manual

Page: 69 / 128

Motor SEM
Page 69
MC-425-13
C0-425-48
REPAIR
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: First measure the diameter of the commutator. If the commutator is close to minimum diameter specified in
Service Limits at the end of this section, then it should be replaced.
2: Using a lathe, cut the armature just enough to remove all grooves, depressions or ridges.
3: Measure the diameter of the commutator. If the commutator is less than the minimum diameter specified in
Service Limits at the end of this section, then the it should be replaced.
4: Thoroughly clean all copper debris from between the commutator segments.
5: 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 (see below).
6: While still in the lathe, smooth the commutator with fine emery cloth and reinspect for debris between the
commutator segments.
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 at the end of this section.
2: Once all segments have been properly undercut, mount the armature in a lathe and smooth the commutator
with fine emery cloth.
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.
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.
WARNING
Properly cut commutator