Section 7. Component Procedures Model 8210/8250 Maintenance Manual
Traction Motor Electrical Components
7-88 Publication: 1146945/001, Revised: 25 Sep 2018
Traction Motor Disassembly
1. If equipped with the optional keypad,
press the red OFF ( O ) key. Place the Main
ON/OFF Switch in the OFF position.
Disconnect the battery connector from the
truck.
2. Remove the lower and grille covers.
3. Disconnect the power cables from the
terminal block on the traction motor,
noting their correct position.
4. Follow steps 1 through 6 in “Drive Unit
Disassembly” on page 7-31 to remove the
top (pinion) gear attached to the motor
armature shaft.
5. Remove the electromagnetic brake
assembly by removing the three mounting
bolts that secure the assembly to the
motor end bell cover [2].
6. Remove the brake disc from the brake
hub.
7. Remove the retaining ring [3] that secures
the brake hub. Remove the hub and
woodruff key [6].
8. Remove the four screws [1] holding the
motor end bell cover [2] to the housing
(stator) [11].
9. Separate the motor end bell cover [2] from
the motor housing.
10. If needed, press off the bearing [5] and
replace.
Traction Motor Assembly
1. Thoroughly clean all parts with solvent or
other non-corrosive cleaning fluid. Air dry
all parts.
N
OTE: Assemble the traction motor in a
dirt-free area.
2. If previously removed, install the traction
motor bearing, bearing shim, and seal in
the gear case.
N
OTE: The seal must be replaced any time the
motor is removed from the housing.
The seal must be installed correctly with
its open side and seal ring positioned
towards the bearing.
3. Reinstall the motor end bell cover [2] on
the motor armature shaft.
4. Install the brake hub, woodruff key [6],
and the retaining ring [3] on the armature
shaft.
5. Carefully slide the traction motor
armature in the motor housing.
6. Attach the motor end bell cover [2] to the
motor housing (stator) with the four cap
screws [1]. Torque screws to 47.8 in. lb.
(5.4 Nm).
7. Follow steps 8 through 12 in “Drive Unit
Assembly” on page 7-31.
8. Make sure the drive unit is filled to the
correct level with gear oil. Install the
fill/level plug. See “Drive Unit Housing
Lubrication” on page 7-33.
9. Install the brake friction disc.
10. Install the brake coil assembly and attach
with three hex head cap screws. Torque
screws to 47.8 in. lb. (5.4 Nm).
11. Before testing operation, move the handle
from extreme left to right and down into
the operating position and back several
times. Check for any wire and cable
interference. Repair or adjust as
necessary.
N
OTE: Check the traction motor cable routing.
Make sure the wires are not near the
drive tire. Secure wires with cable ties to
prevent damage.
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