JLG 4017RS Service Manual - Manual (Page 140)

Hydraulic System
8-10 3614RS, 4017RS
8.8 ENGINE IMPLEMENT PUMP
8.8.1 Pump Replacement
a. Pump Removal
1. Park the machine on a firm, level surface, level the
machine, fully retract the boom, lower the boom, place
the transmission 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.
3. Open the engine cover. Allow the system fluids to cool.
4. Properly disconnect the battery.
5. Drain the hydraulic reservoir. Refer to Section 8.7.1,
“Hydraulic Oil Reservoir Draining.”
6. Thoroughly clean the pump and surrounding area,
including all hoses and fittings before proceeding.
Note: Cap all hoses as you remove them to prevent
unnecessary fluid spillage.
7. Label, disconnect and cap the hydraulic hoses attached
to the pump.
8. Remove the two bolts and two lockwashers (7) securing
the pump (8) to the adapter plate. Remove the o-ring
located between the plate and the pump. Wipe up any
hydraulic oil spillage.
9. If necessary, remove the four bolts securing the adapter
plate to the transmission. Remove the adapter plate.
Note: DO NOT disassemble the operating pump. The pump is
pre-set from the manufacturer.
b. Pump Installation
1. Apply Loctite ® 243 TM to all mounting bolts.
2. If the adapter plate was removed, place into position
with a new, oiled o-ring on the engine. Secure with the
previously used hardware.
3. Place the pump and a new, oiled o-ring into position on
the adapter plate. Align the pump shaft with the
internal gear, so that the machined teeth mesh
together.
4. Align the bolt holes with the pump mount holes. Secure
the pump to the adapter plate with the two bolts and
washers. Torque as required.
5. Uncap and connect the previously labeled hydraulic hoses
to their appropriate locations.
Note: Prime the pump by filling the case with fresh, filtered
hydraulic oil from a clean container through suction port (9)
before installing hose and flanges.
6. Fill the hydraulic reservoir. Refer to Section 8.7.2,
“Hydraulic Oil Reservoir Filling.”
7. Check all routing of hoses and tubing for sharp bends or
interference with any rotating members.
8. Inspect for leaks and check all fluid levels. The hydraulic
reservoir oil level must be to the middle of the sight
gauge.
9. Properly connect the battery.
10. Close and secure the engine cover.
11. Start machine and verify proper operation.
12. Remove the Do Not Operate Tag from the ignition key
switch and the steering wheel.
c. Implement Pump Test
Refer to Section 8.4.1, “Pressure Checks and Adjustments.”
MZ8020
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8
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