Komatsu 830E-AC Shop Manual page 506

WHEEL MOTOR
Removal
1. Block front wheels to prevent movement. Turn
key switch OFF. Wait for 90 seconds to bleed
hydraulic pressure from the steering system.
Turn the steering wheel to ensure no hydraulic
pressure remains. Open the drain valves on the
brake accumulators and bleed off hydraulic
pressure.
2. Raise the rear of truck, using jack adapter as
described in Wheels and Tires, this Section,
until tires clear the ground. Use support stands
or cribbing to block under rear housing.
3. Remove the inner and outer wheels from wheel
motor. Refer to Wheels and Tires, this Section,
for wheel removal instructions.
4. Drain oil from wheel motor gear case.
NOTE: To aid in assembly tag all lines and electrical
connections prior to disassembly.
5. Disconnect brake, lubrication and electrical
connections from wheel motor.
The wheel motors weigh approximately 11,680 kg
(25,750 lbs). Make sure lifting device is capable of
handling the load safely.
6. Attach a lifting device to wheel motor and take
up slack. Figure 5-1 illustrates use of an over-
head crane if the body has been removed.
Remove cap screws securing wheel motor to
rear housing. Refer to appropriate General
Electric Service Manual for complete service
instructions on electric wheel motor.
G5-4
Cleaning and Inspection
1. Thoroughly clean the cap screw holes and
mounting faces of the rear housing and the
wheel motor.
2. Check mounting faces of wheel motor and rear
housing for nicks, scratches or other damage.
Installation
Maximum Cap Screw Usage
High tightening force is required to attach wheel
motors. Repeated tightening operations will
cause cap screw material to fatigue and break.
DO NOT reuse mounting hardware (cap screws
and hardened washers) more than twice after
original installation (3 total - see NOTE below).
Replace cap screws and washers after third use.
NOTE: The following method is suggested to control
the "3 - Use" maximum:
Punch mark the cap screw heads with a center
punch after each tightening as follows:
Initial Installation - No (0) marks.
Second Installation - One (1) punch mark.
Third Installation - Two (2) punch marks.
Wheel motor mounting cap screws are specially
hardened bolts that meet or exceed Grade 8 specifi-
cations. Replace only with cap screws of correct
hardness. Refer to Komatsu Parts Catalog for correct
part number. Before installation, inspect each cap
screw for any defects and number of punch marks.
Replace cap screw and related hardware if two
punch marks are evident; do not reuse if any defect
is suspected. Hardware showing signs of rust, corro-
sion, galling or local yielding on any seat or thread
surfaces should be replaced. Replace all wheel
motor mounting hardware if the truck was operated
with the wheel motor mounting in a loose joint condi-
tion.
Rear Axle Housing G05025