Inspecting The Motor Brushes; Motors With Internal Cooling Fans; Motor Removal And Installation; Motor Inspection - Taylor-Dunn SC-090-24 Operation, T Roubleshooting And Replacement Parts Manual

Maintenance, Service, and Repair
INSPECTING THE MOTOR
BRUSHES

Motors with internal cooling fans

Typical motor with cooling fan indicated by
the arrow
Note: There are four brushes in the motor. The
brushes will not wear at the same rate. It
is recommended that all four brushes are
inspected at the same time.
Note: In some vehicle configurations it may not
be possible to inspect all four brushes
while the motor is in the vehicle. Refer
Transmission Service
to
information on removing the motor.
1. Make sure the key-switch is in the "OFF"
position, then remove the key.
2. Place the forward-reverse switch in the
center "OFF" position.
3. Set the park brake.
4. Place blocks under the front wheels to
prevent vehicle movement.
5. Disconnect the main positive and
negative cables at the batteries.
6. Look through the brush cover and compare the top
of the brush to the top of the brush holder. If it is
even with or below the top of the brush holder then
the brushes should be removed and measured.
Replacing the Brushes
Refer to
information regarding removing the motor brushes.
7. If any one brush is less than or equal to the service
limit specified in
Service Limits
brushes should be replaced.
8. Reconnect the main positive and negative cables
at the batteries.
9. Remove the blocks from behind the wheels,
release the park brake and test drive.
Motor Service
Page 2
MOTOR REMOVAL AND
INSTALLATION
See the
removing or installing the motor.

MOTOR INSPECTION

Disassembly
1. Remove the motor from the vehicle. See the
Transmission
removing the motor.
2. Remove the brush cover and pull the brushes out
away from the commutator.
3. Remove the dust cap from the rear motor housing.
4. Place the motor in a press, and press the armature
out of the rear bearing.
Note:
5. Remove the housing screws from the rear motor
section for
housing and remove the housing from the motor.
6. Remove the nuts from the armature studs and
remove the two brush assemblies.
7. Remove the bearing circlip and press the motor
bearing out of the housing and discard.
Inspection
1. Measure the length of each
motor brush.
• If any one brush is less
section for
2. Measure the diameter of
, then all four
the commutator.
• If the commutator is
Transmission
section for information on
section for information on
Removing the armature will damage the
motor bearing. The motor bearing should be
replaced whenever the armature is removed.
than or equal to the
service limit specified
Service
in section
Limits
, then all four
b r u s h e s s h o u l d b e
r e p l a c e d . R e f e r t o
R e p l a c i n g t h e
Brushes
section for
information regarding
replacing the motor
brushes.
less than the minimum
diameter specified
Service
in section
Limits
, then the motor
must be replaced.