Drive Motor
Page 70
R-380 DC System
MR-380-03
REPAIR
Brushes
Note: It is recommended that all four brushes be replaced
as a set.
Note: The motor must be removed from the vehicle for
this procedure. Refer to Transmission Service
section for information on removing the motor.
The motor must be disassembled to replace the brushes or
the bearings. Refer to Disassembly section for information on
taking the motor apart.
Commutator
Note: The motor must be removed from the vehicle for
this procedure. Refer to Transmission Service
section for information on removing the motor.
1: The armature must be removed from the motor for this
procedure. Refer to Disassembly section for information
on taking the motor apart.
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, then the motor must be
replaced.
4: Thoroughly clean all copper debris from between the
commutator segments.
Note: Copper debris in the undercut area can give a
reading of a shorted armature.
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.
6:
While still in the lathe, smooth the commutator with fine
emery cloth.
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.
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 and undercut commutator
Summary of Contents for R0-380-36
Page 6: ......
Page 12: ...Page 12 MR 380 03 Introduction R 380 DC System Notes...
Page 21: ...Table of Contents Special Tool List Special Tool List Troubleshooting Guide 23...
Page 24: ...Tool List Page 24 R 380 DC System MR 380 03 Notes...
Page 27: ...Lubrication Page 27 MR 380 03 R 380 DC System LUBRICATION DIAGRAM...
Page 28: ...Lubrication Page 28 R 380 DC System MR 380 03 Notes...
Page 44: ...Drive Axle Page 44 R 380 DC System MR 380 03 Notes...
Page 53: ...Steering Page 53 MR 380 03 R 380 DC System Exploded View of Steering Gear...
Page 72: ...Drive Motor Page 72 R 380 DC System MR 380 03 Notes...
Page 90: ...Tires Wheels Page 90 R 380 DC System MR 380 03 Notes...
Page 102: ...Replacement Parts Page 102 MR 380 03 R 380 DC System AXLE ASSEMBLY FRONT...
Page 104: ...Replacement Parts Page 104 MR 380 03 R 380 DC System AXLE REAR...
Page 106: ...Replacement Parts Page 106 MR 380 03 R 380 DC System BATTERY...
Page 108: ...Replacement Parts Page 108 MR 380 03 R 380 DC System BRAKES BRAKE LINES...
Page 114: ...Replacement Parts Page 114 MR 380 03 R 380 DC System BRAKES PARK BRAKE LINKAGE...
Page 118: ...Replacement Parts Page 118 MR 380 03 R 380 DC System CAB DOORS...
Page 136: ...Replacement Parts Page 136 MR 380 03 R 380 DC System STEERING LINKAGE...
Page 142: ...Replacement Parts Page 142 MR 380 03 R 380 DC System Notes...
Page 143: ......