Yale MPB040-E, Manual

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STEERING PUMP MOTOR
NOTE: Some electrical trucks use a steering pump
motor. Refer to your truck model's service manual for
instructions on removal and installation of steering
pump motors.
1. Disconnect battery connector. Remove floor plate
from lift truck for access to steering pump motor.
Open hood for access to motor. Remove screws
that hold two brush cover plates to motor housing.
2. Inspect brushes and commutator as described in
previous paragraphs for traction and hydraulic
pump motors. The brush replacement procedure
is also the same, although there are only two
brushes for the steering pump motor. See Ta-
ble 3.
3. Install brush covers and screws. Install floor plate
or close hood and connect battery connector.
NORMAL COMMUTATOR SURFACE
A commutator that has been in service will have a
smooth and polished surface with a darker brown
color where it rotates under the brushes. See Table 1.
A variation of color on the commutator surface be-
tween light brown and darker brown is normal. This
surface condition is the lubrication between the com-
mutator and the brushes. The brushes will wear rap-
idly if this surface condition does not develop during
the first 6 to 10 hours of operation after a commutator
with a new surface is installed.
COMMUTATOR PROBLEMS
Commutator and motor problems and are shown in
Table 2.
0620 YRM 0294 Brush and Commutator Inspection
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