JLG 534D-10 - Manual (Page 139)

8.15 534D-9, 534D-10 & 544D
Hydraulic System
b. Front Drive Motor Disassembly
Although individual parts are available for the drive motor,
it is recommended that any disassembly and reassembly
is done by an authorized JLG Service Center.
c. Front Drive Motor Installation
1. Apply Molybdenum on the splined shaft and “Ultra
Blue” silicon sealant at the base of the drive motor.
2. Align the splined shaft on the drive motor with the
axle carrier and slide into place.
3. Apply Loctite® 242 and install the four bolts holding
the drive motor to the carrier. Torque to
265 lb-ft +25/-0 (359 Nm +34/-0).
4. Uncap and reconnect the previously labeled
hydraulic hoses to the appropriate locations.
Note: Uncap each hose as you install them to prevent
unnecessary fluid spillage.
5. Connect the battery negative (-) cable to the battery
negative (-) terminal. Install the deck cover.
6. Add hydraulic oil as needed.
7. Start and warm machine to operating temperature
and add hydraulic oil if needed.
8.7.2 Rear Drive Motors
The rear drive motors are mounted on each rear drive
hub. The motors are active in 4WD only.
Note: The removal, disassembly and installation of the
rear drive motor applies for either side.
a. Rear Drive Motor Removal
1. Park the machine on a firm, level surface, level the
machine, fully retract the boom, lower the boom,
place the transmission control lever in (N) NEUTRAL,
engage the park brake and shut the engine OFF.
2. Place a Do Not Operate Tag on both the ignition key
switch and the steering wheel, stating that the
machine should not be operated.
3. Open the engine cover and the hydraulic oil
reservoir/fuel tank cover. Allow the system fluids to
cool.
4. Disconnect the battery negative (-) cable from the
battery negative (-) terminal.
5. With the engine OFF, relieve any trapped pressure in
the hydraulic system.
6. Thoroughly clean the drive motor and surrounding
area, including all hoses and fittings, before
proceeding.
7. Place a suitable container to catch hydraulic fluid
drainage beneath the axle.
Note: Cap all hoses and tubes as you remove them to
prevent unnecessary fluid spillage.
8. Label, disconnect and cap all the hydraulic hoses
and tubes attached to the drive motor. Cap all fittings
and openings to prevent dirt and debris from
entering the hydraulic system.
9. Wipe up any hydraulic fluid spillage in, on, near and
around the machine and the work area.
10. Loosen and remove the four nuts holding the drive
motor to the drive hub housing studs.
11. Pull the drive motor back from the housing studs and
place on a suitable support or table.
b. Rear Drive Motor Disassembly
Although individual parts are available for the drive
motors, it is recommended that any disassembly and
reassembly is done by an authorized JLG Service
Center.
c. Rear Drive Motor Installation
1. Apply Molybdenum on the splined shaft and “Ultra
Blue” silicon sealant at the base of the drive motor.
2. Align the splined shaft on the drive motor with the
drive hub housing and slide into place over the
housing studs.
3. Apply Loctite® 242 and install the four nuts and lock
washers holding the drive motor to the drive hub
housing.
4. Uncap and reconnect the previously labeled
hydraulic hoses and tubes to the appropriate
locations.
Note: Uncap each hose and tube as you install them to
prevent unnecessary fluid spillage.
5. Connect the battery negative (-) cable to the battery
negative (-) terminal.
6. Add hydraulic oil as needed.
7. Start and warm machine to operating temperature
and add hydraulic oil if needed.