Steering System Purge Procedure - JLG G5-18A Service Manual

5.3.8

Steering System Purge Procedure

1. Start the machine. Warm the engine and hydraulic
system to operating temperatures. Cycle all
hydraulic functions several times to purge air from
the system.
2. Park the machine on a firm, level surface, fully
retract and lower the boom, and place the
transmission control lever in (N) NEUTRAL. Engage
the parking brake. Ensure wheels are forward.
Note: Maintain a high idle throughout this procedure.
3. Select 2-Wheel Front Steer (2) mode, and turn the
steering wheel fully to the right, then fully to the left,
continuing a hard turn for 2 seconds after the stop in
each direction to purge air from the system. Repeat
this cycle 5 times.
Note: The rear wheels should be forward, the front
wheels should be left.
4. Select 4-Wheel Circle Steer (1) mode, and turn the
steering wheel fully to the right, continuing a hard
turn for 2 seconds after the stop to purge air from the
system.
5. Select 2-Wheel Front Steer (2) mode, and turn the
steering wheel fully to the left, then fully to the right,
continuing a hard turn for 2 seconds after the stops
in each direction to purge air from the system.
Repeat this cycle 2 times.
Note: The rear wheels should be left, the front wheels
should be right.
G5-18A, 2505
Axles, Drive Shafts, Wheels and Tires
6. The rear wheels should be fully left. If not, remain in
2-Wheel Front Steer (2) mode, and turn the steering
wheel fully to the left, then repeat steps 4-6 before
continuing.
7. Select 4-Wheel Circle Steer (1) mode, and turn the
steering wheel fully to the left, continuing a hard turn
for 2 seconds at the stop to purge air from the
system.
Note: The rear wheels should be right, the front wheels
should be left.
8. Select 2-Wheel Front Steer (2) mode, and turn the
steering wheel fully to the right, then fully to the left,
continuing a hard turn for 2 seconds at the stops in
each direction to purge air from the system. Repeat
this cycle 2 times.
9. The rear wheels should be fully right as shown
above. If not, remain in 2-Wheel Front Steer (2)
mode, and turn the steering wheel fully to the right,
then repeat steps 7-9 before continuing.
10. Repeat steps 4-10 five times to completely purge all
air from the system.
11. Select 4-Wheel Circle Steer (1) mode. Turn the
steering wheel fully to the right, then fully to the left,
continuing a hard turn for 2 seconds at the stops in
each direction to purge air from the system. Repeat
this cycle 5 times.
12. Align all four wheels forward.
13. Select 4-Wheel Crab Steer (3) mode. Turn the
steering wheel fully to the right, then fully to the left,
continuing a hard turn for 2 seconds at the stops in
each direction to purge air from the system. Repeat
this cycle 5 times.
14. Repeat steps 3-13 to complete this Steering System
Purge Procedure.
Note: Align all four wheels forward before driving
machine.
5-9