Inspecting The Motor Brushes; Motors With Internal Cooling Fans; Enclosed Motors (Ge, No Cooling Fan) - Taylor-Dunn SC-001-59 Operation, T Roubleshooting And Replacement Parts Manual

Motor Service

INSPECTING THE MOTOR BRUSHES

Typical motor with cooling fan indicated by
the arrow

Motors with internal cooling fans

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 to
Transmission Service
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. Refer to
section for 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
Page 2
section for
Replacing the Brushes
, then all four
Typical brush and brush holder

Enclosed Motors (GE, no cooling fan)

General Electric Motors
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.
NOTE: Some motors may not have the brush
inspection holes. In this case, the motor must
be disassembled to inspect the brushes. For
future inspections, holes msy be drilled into
the motor housing after it has been
disassembled.
6. Insert a 0.035" diameter wire through the brush
inspection hole above each brush until it contacts
the top of the brush.
7. Mark the wire to indicate how far it was inserted
into the motor housing.
8. Remove the wire and measure how far into the
motor the wire was inserted.
9. If any one wire insertion length exceeds the length
specified in
Service Limits
should be replaced. Refer to
section for information regarding
Brushes
replacing the motor brushes.
10. Reconnect the main positive and negative cables
at the batteries.
11. Remove the blocks from behind the wheels,
release the park brake and test drive.
, then all four brushes
Replacing the