JLG 18RS Service Manual - Manual (Page 135)

SECTION 5 - HYDRAULICS
3121284 – JLG Lift – 5-45
Charge Pump If the pump has an auxiliary pump attached, remove the auxil-
iary pump and connecting shaft before removing the auxiliary
pad.
REMOVAL
1. Position pump so end cover or auxiliary pad is on top.
2. If necessary, remove auxiliary pump (not shown), or
shipping cover (K300) and pad seal (K250) as shown on
following page.
3. Remove end cover/auxiliary pad screws (K400) using a 8
mm internal hex wrench.
NOTE: Ensure proper torque on aux pad screws (K400). If neces-
sary, replace screws.
NOTE: Alignment pins (G450) are in end cover. They may dislodge
during disassembly.
4. Remove and discard gasket (K150).
5. Remove thrust washer (K500). Note thrust washer orien-
tation.
6. Use a small hook to remove pressure balance plate
(S200) and seal (S300). Note plate orientation. Discard
seal.
7. Remove coupling (K200). Use a small hook if necessary.
8. Remove the charge pump outer ring (S150), and gearset
(S100).
9. Remove valve plate (S250) with seal (S300). Discard seal.
INSPECTION
1. Inspect the components for wear, scratches or pitting.
Carefully inspect the valve and pressure-balance plates.
Scratches on these components will cause a loss of
charge pressure. If any component shows signs of wear,
scratching or pitting, replace it.
REASSEMBLY
NOTE: If necessary, you must replace charge pump components
(gearset, outer ring, valve and pressure-balance plates) as
a kit.
1. Install new seals (S300) in the valve (S250) and pressure-
balance (S200) plates.
2. Install valve plate (S250) in the same orientation as
removed.
3. Lubricate and install charge pump (S100) and outer ring
(S150).
4. Install charge pump coupling (K200).
5. Install pressure balance plate (S200) in the same orienta-
tion as removed.
Figure 5-50. Charge Pump Removal/Installation