JLG 4017PS Service Manual - Manual (Page 145)

8-13 3706PS, 3707PS, 4014PS, 4017PS, 33.7, 37.6, 37.7
Hydraulic System
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 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.
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. Remove the engine compartment belly pan.
7. 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.
8. Label, disconnect and cap the hydraulic hoses
attached to the pump.
9. Remove the two bolts and two lockwashers (4)
securing the pump (5) to the adapter plate (6).
Remove the o-ring (7) located between the plate and
the pump. Wipe up any hydraulic oil spillage.
10. If necessary, remove the four bolts securing the
adapter plate to the transmission. Remove the
adapter plate.
11. If a new pump will be installed, remove all hose
fittings from the pump.
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.
6. Fill the hydraulic reservoir. Refer to Section 8.7.2,
“Hydraulic Oil Reservoir Filling.”
7. Prime the pump by filling the case with fresh, filtered
hydraulic oil from a clean container through the 45°
elbow fitting (8) port.
8. Remove the fitting noting the orientation. Fill the
pump, install and tighten the 45° elbow fitting.
9. Check all routing of hoses and tubing for sharp
bends or interference with any rotating members.
10. Inspect for leaks and check all fluid levels. The
hydraulic reservoir oil level must be to the middle of
the sight gauge.
11. Install the belly pan.
12. Properly connect the battery.
13. Close and secure the engine cover.
14. Start machine and verify proper operation.
15. 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.”
MZ6450
7
5
4
6
MZ6460
8