General
This section describes disassembly and assembly,
brush installation, inspection, and checks for
malfunctions of DC motors. Inspect the commutator
and brushes every 350 hours of operation. The
commutator is the rotating electric connection
between the armature and the electric power supplied
by the battery. Brushes made of carbon compounds
slide on the rotating commutator and are the path for
electricity from the battery to the commutator and the
armature. The maintenance of the commutator and
the brushes is important to the good operation of a
DC motor.
Traction motors and hydraulic pump motors are
similar in design. The hydraulic pump motors are
smaller than the traction motors, but the disassembly
and maintenance of these motors are similar. The
cooling fan in the traction motors is fastened to the
armature and can be removed from the armature. The
cooling fan can be removed during disassembly of the
traction motor.
The cooling fan in the hydraulic pump motors can be
a press fit on the armature shaft and is not easily
removed during disassembly of the motor. The
armature and cooling fan must be removed from the
drive end of the motor during disassembly.
The assembly and disassembly of the motor used for
the power steering pump is described in the Steering
System section. This motor is a permanent magnet
motor.
0620 YRM 0294 General
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