JLG G5-18A Service Manual - Manual (Page 101)

8-11 G5-18A, 2505H, 25.5
Hydraulic System
8.9 HYDRAULIC SYSTEM PUMP
8.9.1 Implement Pump Removal
1. Park the machine on a firm, level surface, fully retract
the boom, support 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. Loosen and remove the belly pan and front fender.
6. Drain the hydraulic oil reservoir. Refer to Section
8.8.2, “Hydraulic Oil Reservoir Draining.”
7. Thoroughly clean the pump (1) and surrounding
area, including all hoses and fittings before
proceeding.
8. From under the machine, label, disconnect and cap
all hydraulic hoses attached to the pump, cap all
fittings and plug hoses to keep dirt & debris from
entering the hydraulic system.
9. Remove the two bolts and washers (2) securing the
pump in place.
8.9.2 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 previously removed bolts and washers
to secure the pump into place. Torque to
64 lb-ft (87 Nm).
3. Uncap and reconnect previously labeled hydraulic
hoses to their proper locations.
4. Fill the hydraulic reservoir with clean, filtered
hydraulic oil.
5. 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.
6. Check all routing of hoses and tubing for sharp
bends or interference with any rotating members. All
tube and hose clamps must be tight.
7. Properly connect the battery.
8. 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.
9. Inspect for leaks and check all fluid levels.
10. Install the front fender and belly pan.
11. Close and secure the battery and engine covers.
12. Remove the Do Not Operate Tags from both the
ignition key and the steering wheel.
Note: Check for leaks and repair as required before
continuing.
13. Close and secure the engine covers.
14. Remove the Do Not Operate Tags from both the
ignition key and the steering wheel.
8.9.3 Pump Test
1. Perform a flow meter test on the pump.
2. Check the system functions.
MY8640
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