JLG G6-23A Service Manual - Manual (Page 80)

Hydraulic System
8.10 G5-19A, G6-23A
6. Carefully fit the mounting plate in its original position.
The drain hole in the rear face must be to the low
pressure side, DO NOT DAMAGE THE SEAL ON
THE SHAFT.
7. Fit washers and nuts to studs and torque to
65-70 lb-ft (88-95 Nm).
8. Pour a small amount of clean hydraulic fluid into the
inlet port and check that the shaft can be turned
without undue force.
f. Implement Pump Installation
1. Position pump in the mounting position.
Note: Use new o-rings where required. Never reuse o-
rings.
2. Use the two Allen head bolts to secure the pump into
place. Torque to 70 lb-ft (95 Nm).
3. Install the engine oil filter. Check engine oil level.
Add oil as required.
4. Uncap and reconnect previously labeled hydraulic
hoses to their proper locations.
5. Fill the hydraulic reservoir with clean, filtered
hydraulic oil.
6. Prime the pump by filling the case drain port with fresh,
filtered hydraulic oil from a clean container before
installing the case drain connector and hose.
7. Check all routing of hoses and tubing for sharp
bends or interference with any rotating members. All
tube and hose clamps must be tight.
8. Install the belly pan.
9. 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.
10. Inspect for leaks and check all fluid levels.
Note: Check for leaks and repair as required before
continuing.
11. Close and secure the engine cover.
g. Pump Test
1. Perform a flow meter test on the pump.
2. Check the load sense.
3. Check the system functions.
8.9 FRONT DRIVE PUMP
For internal service instructions and detailed
specifications, contact your local JLG distributor for a
copy of the Rexroth Repair Manual (P/N 31200123).
a. Front Drive Pump 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 an 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. Allow the system fluids to
cool.
4. Drain the hydraulic reservoir or attach a vacuum
adapter fitting to the reservoir fill tube to reduce oil
spillage.
5. Label and disconnect all hydraulic hoses attached to
the pump, cap all fittings and plug hoses to keep dirt
& debris from entering hydraulic system.
6. Support the pump and remove the four bolts
attaching the pump to the front axle.
b. Front Drive Pump Installation
1. Install the pump onto the front axle. Torque the four
bolts to 178 lb-ft (241 Nm). Use only new seals.
2. Uncap and reconnect the previously labeled
hydraulic hoses to their appropriate locations.
3. Fill the pump with hydraulic fluid through the fill plug
(1) before starting the machine.
4. Refill the hydraulic reservoir and inspect for leaks
around the machine.
5. Close and secure the engine cover.
MAH0520
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