JLG G5-18A Service Manual - Manual (Page 102)

Hydraulic System
8-12 G5-18A, 2505H, 25.5
8.10 FRONT DRIVE MOTOR
For internal service instructions and detailed
specifications, contact the local JLG Dealer.
8.10.1 Front Drive Motor Removal
1. Park the machine on a firm, level surface, 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 battery and engine covers. Allow the
system fluids to cool.
4. Properly disconnect the battery.
5. Drain the hydraulic reservoir or attach a vacuum
adapter fitting to the reservoir fill tube to reduce oil
spillage.
6. Label and disconnect all hydraulic hoses attached to
the pump, cap all fittings and plug hoses to keep dirt
& debris from entering hydraulic system.
7. Disconnect the electrical connector (3) on the
proportional valve.
8. Support the motor and remove the four bolts (4)
securing the motor to the front axle.
8.10.2 Front Drive Motor Installation
1. Install the motor onto the front axle and secure with
the four previously removed bolts (4). Torque to
72 lb-ft (97 Nm). Use only new seals.
2. Uncap and reconnect the previously labeled
hydraulic hoses to their appropriate locations.
3. Fill the motor with hydraulic fluid through the fill plug
(5) before starting the machine.
4. Refill the hydraulic reservoir and inspect for leaks
around the machine.
5. Properly connect the battery.
6. Start the engine and run at approximately one-third
to one-half throttle for about one minute without
moving the machine or operating any hydraulic
functions.
7. Inspect for leaks and check all fluid levels.
8. Close and secure the battery and engine covers.
9. Remove the Do Not Operate Tags from both the
ignition key and the steering wheel.
MY8660
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