Columbia ParCar Expediter EX21-24A, Service Manual, Page: 92 / 94

Section 10 – Traction Drive System
10-5
MOTOR INSTALLATION Figure 10-17
1. Coat open end of the armature and rear axle input shaft
with Anti-Seize compound. Insert a new rubber bumper into
open end of armature. Place motor into vehicle and onto
input shaft.
2. Rotate motor to align mounting bolt holes to axle/differential
housing. Install 3 bolts securing motor to rear
axle/differential housing, while carefully supporting motor to
prevent it from falling. Loosely tighten screws A and B, then
loosely tighten screw C to draw face of motor up to flange
on axle evenly (Figure 10-18). Torque screws A and B to
100 in. lbs. (11.3 Nm) Then tighten screw C to 100 in. lbs.
(11.3 Nm).
3. Inspect electrical system cables for terminal identification
(A-1, A-2, etc.). Position cables to traction motor, double
checking wiring diagram to motor cable installation to
5 . Pull back each brush in it’s holder, allowing the spring to
rest against the side of each brush. This will hold each
brush in place, preventing interference and damage to
commutator and brushes during armature installation.
. 6 Press motor head and bearing onto armature, pressing
only against inner race of the bearing. See Figure 10-15.
. 7 Check that head and bearing rotates freely, without noise
or irregular interference. Press brushes inward against
armature commutator. Relocate the springs to push on
the brushes. Check that brushes ride smoothly on the
commutator.
. 8 Install motor head and armature assembly into field coil
and frame assembly, aligning armature terminals to field
coil terminals.
Install two bolts securing motor head to frame. Make 9 .
certain motor head is completely seated to the frame
before tightening. Torque bolts to 156 in. Ib. (17.6 Nm).
Figu re 10 - 15
Figure 10 - 16
A
B
C