Group 16, Electrical Motors
SM 765, Nov ’06 Pump Motor Overhaul • 16-3-1
Inspection Procedure
Before performing these service procedures:
• Park truck safely.
• Fully lower the upright.
• Apply the park brake
• Turn the key switch OFF.
• Disconnect battery from truck receptacle.
• Discharge capacitors by connecting a 200 ohm 10
watt resistor between the positive and negative
input post of the controller for 10 seconds.
Motor Cleanliness
Electric motors should be kept clean at all times to prevent
shorting, minimize wear, and optimize cooling.
• Wipe off all dust, dirt, oil, water, etc., from outer
surface of motor.
• Remove any debris from cooling fan air vents and
around motor frame to prevent overheating.
• Air-clean (blow off) motors using clean, dry
(moisture-free) compressed air at 207 kPa (30 psi)
maximum air pressure.
The presence of any oil on or near the motor could indi-
cate either bad bearings or leaking hydraulic system.
Determine cause and repair problem before extensive
motor damage occurs.
Pump Motor Removal and Installation
1. Tilt the steering column fully forward and remove
the floor plate.
2. Disconnect battery and remove all electrical cables
from the motor. Tag cable terminals to aid in rein-
stallation. Position cables out of the way of motor
removal.
3. Have drain pan in place to catch axle oil. Remove
the hydraulic pump from the motor (see group 29 for
instructions).
IMP
RTANT
The pump motor assembly weighs over 110
pounds. A suitable lifting device may be
needed to help hold and then raise the motor
from the truck.
4. Remove the 4 nuts securing the pump motor mount-
ing plate to the frame bottom.
5. Lift the motor assembly and place it on a bench for
service.
6. Reinstall in reverse order.
N
TE
When removing or installing cables to motor,
hold the terminal's lower nut with a wrench
while turning the upper fastening nut with
another wrench.
Torque to 40 - 45 N.m
(29.5 - 33.2 Lbs.ft)
Section 3
Pump Motor Overhaul
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