Yale MPB040-E, Manual

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Brush and Commutator Inspection
HYDRAULIC PUMP MOTOR AND
TRACTION MOTOR
NOTE: When inspecting brush conditions and motor
commutator conditions for head damage or abnormal
wear, the battery maintenance and condition should
be eliminated as a cause first. See
Industrial Battery
2240YRM0001.
NOTE: The brushes and commutator can be inspec-
ted, the brushes can be replaced, and Stoning the
Commutator can be done with the motor installed in
the truck.
NOTE: Inspect the brushes and commutator every
350 hours for best operation and to prevent motor
damage. The hydraulic pump motor normally has
more start cycles than other motors, so it can have
more wear and possible damage.
NOTE: The following procedure is for inspecting the
brushes and commutator with the motor installed in
the lift truck. The same inspections can be done with
the motor removed. If the motor is removed, start at
Step 3.
1. To rotate the commutator of the traction motor
without moving the truck, the drive wheels must
be raised. See Figure 1. Raise drive wheels so
commutator of the traction motor can be rotated
without moving lift truck. See
How To Raise
Drive Wheels in the Operating Manual or the
Periodic Maintenance YRM section for your lift
truck.
NOTE: For some models of lift trucks, the battery
does not need to be removed to access the electric
motors. Other models will require the removal of the
battery before gaining access to the electric motors.
To remove the battery, either raise the hood panels or
unfasten the floor plate, depending on which motor
needs to be accessed.
2. Remove battery. See How to Remove Battery in
the Operating Manual or the Periodic Mainte-
nance YRM section for your lift truck. Remove ac-
cess plate to motors. If the battery in your lift truck
does not need removal for access to the motors,
go to Step 3.
1. ARMATURE
(DRIVE) SHAFT
2. COOLING FAN
3. BRUSH COVER
Figure 1. Traction Motor
WARNING
Compressed air can move particles so that they
cause injury to the user or to other personnel.
Make sure that the path of the compressed air is
away from all personnel. Wear protective goggles
or a face shield to prevent injury to the eyes.
NOTE: Vacuum cleaning, when possible, is the rec-
ommendation of manufacturers of electric motors.
The use of compressed air can send dirt particles into
the bearings and other areas of the motor that can
cause possible damage.
3. Remove brush covers at rear of motor. See Fig-
ure 2. Wear eye protection. Use a vacuum
cleaner or compressed air to remove dirt and
brush dust from commutator area.
Figure 2. Brush Cover Removal From Motor
Brush and Commutator Inspection 0620 YRM 0294
2