JLG 340AJ, Service And Maintenance Manual

Page: 233 / 370

SECTION 5 - HYDRAULICS
3121259 – JLG Lift – 5-73
Charge Check / HPRV
REMOVAL, INSPECTION, ASSEMBLY
1. Using a hex wrench shown in the table below, remove
the HPRVs (L1 50). Remove and discard the O-rings
(L060) and backup rings (L068).
2. Inspect the sealing surfaces in the pump for nicks or
scratches. Check the valves for damage. Replace any
damaged components.
3. Lubricate and install new backup rings (L068) and O-
rings (L060).
4. Install HPRVs. Torque to the value in the table below.
5. Operate the vehicle/machine through full range of con-
trols to ensure proper operation. Check for leaks.
Charge Pressure Relief Valve
Replace the charge pressure relief valve (V010) as a complete
unit. Do not attempt to repair the internal components of the
valve. Torque to 52 Nm [38 lb.ft.]. See Charge Pressure Relief
Valve Adjustment for adjustment instructions.
REMOVAL, INSPECTION, ASSEMBLY
1. Using a 22 mm wrench, remove the charge pressure
relief valve (V010). Discard seal (V024).
2. Inspect the sealing surfaces of the pump for nicks or
scratches.
3. Lubricate and install new seal (V024).
4. Install the charge pressure relief valve. Torque to 52 Nm
[38 lb.ft.].
5. Operate vehicle/machine through full range of controls
to ensure proper operation.