Komatsu 930E-2, Shop Manual

Page: 270 / 739

WHEEL MOTOR
Read and observe the following instructions be-
fore attempting removal of the wheel motors or any
repairs on the propulsion system components!
•
Do not step on or use any power cable as a
handhold when the engine is running.
•
All removal, repairs and installation of propul-
sion system electrical components, cables etc.
must be performed by an electrical maintenance
technician properly trained to service the sys-
tem.
•
In the event of a propulsion system malfunction,
a qualified technician should inspect the truck
and verify the propulsion system does not have
dangerous voltage levels present before repairs
are started.
After the truck is parked in position for the repairs, the
truck must be shut down properly to ensure the safety
of those working in the area of the wheel motors, and
possibly the electrical cabinet and retarding grids. The
following procedures will ensure the electrical system
is properly discharged before repairs are started.
PREPARATION
1. Reduce the engine speed to idle. Place the selec-
tor switch in NEUTRAL and apply the parking
brake. Be certain the parking brake applied indi-
cator lamp in the overhead panel is illuminated.
2. Place the drive system in the REST mode by
turning the Rest switch on the instrument panel
ON. Be certain the REST warning lamp is illumi-
nated.
3. Shut down the engine using the keyswitch. Place
the GF Cutout Switch in the CUTOUT position.
4. Verify the LINK VOLTAGE lights are OFF. If they
remain on longer than 5 minutes after shutdown,
notify the electrical department.
5. Verify the steering accumulators have bled down
by attempting to steer.
6. Bleed down the brake accumulators using the
manual bleed valves on the brake manifold.
7. Open the battery disconnect switches.
Front wheels must be securely blocked to prevent
movement as brakes will be released.
All electrical cables and hydraulic hoses should
be marked prior to removal.
Close the shut-off valves on the hydraulic pumps
to reduce amount of oil loss from brake system.
Removal
NOTE: If suitable equipment is available to lift wheel
motor assembly from the axle housing it is not neces-
sary to remove the truck body. The equipment used
must be capable of lifting and supporting the weight of
the complete wheel motor assembly, 35,050 Lbs.
(15,913 kg.), must be mobile and must be capable of
aligning the wheel motor to the axle housing mounting
flange during installation.
If the wheel motor must be removed by use of a crane
or overhead hoist, refer to Section “B” for body removal
instructions.
1. Raise the rear of truck as described in this Section,
until tires clear the ground. Use support stands or
cribbing to block under rear housing.
2. Remove the inner and outer wheels from wheel
motor. Refer to tire and wheel removal instruc-
tions in this Section. Be certain additional cap-
screws have been installed to provide support for
the wheel motor transmission housing while the
rear tires are removed.
3. With the pump shut-off valves in the closed posi-
tion, remove the drain plug at bottom of brake
assembly and drain oil from disc brake housing.
4. Remove covers from access holes (17, Figure 5-1)
5. Disconnect brake system cooling lines (2 & 10) at
brake back plate. Disconnect brake apply lines
(11). Cap and plug openings.
6. Remove clamps (3) securing brake hoses to spin-
dles.
7. Open rear access cover and remove wing nuts
securing duct tube to axle housing. Remove tube.
8. Open access covers inside axle housing.
9. Disconnect parking brake supply line for the motor
to be removed. Disconnect air sensor hose if
necessary.
10. Remove wheel motor cooling air exhaust duct (5)
from between wheel motors.
G5-4 Rear Axle Housing 9/99 G05015