JLG 4394RT Service Manual - Manual (Page 195)

SECTION 4 - HYDRAULICS
3121249 – JLG Lift – 4-29
Charge Check/HPRV
REMOVAL:
1. Using a 22 mm hex wrench, remove the HPRVs
(L100/L200). Remove and discard the O-rings
(L060) and backup rings (L068).
INSPECTION:
2. Inspect the sealing surfaces in the pump for nicks or
scratches. Check the valves for damage. Replace
any damaged components.
REASSEMBY:
3. Lubricate and install new backup rings (L068) and
O-rings (L060).
4. Install HPRVs. Torque to the value in the illustration
below.
5. Operate the machine through full range of controls
to ensure proper operation. Check for leaks.
Charge Pressure Relief Valve
Replace the charge pressure relief valve (V10) as a com-
plete unit. Do not attempt to repair the internal compo-
nents of the valve. Torque to 38 lb-ft (52 Nm).
REMOVAL:
1. Using a 22 mm wrench, remove the charge pressure
relief valve (V10). Discard seal (V024).
INSPECTION:
2. Inspect the sealing surfaces of the pump for nicks or
scratches.
REASSEMBY:
3. Lubricate and install new seal (V024).
4. Install the charge pressure relief valve. Torque to 38
lb-ft (52 Nm).
5. Operate machine through full range of controls to
ensure proper operation.
High Pressure Relief Valves (HPRVs)
81 ft.lbs.
(
) 110 Nm
L100 / L200
22 mm
L068
L060
Charge Pressure Relief Valve
38 ft.lbs.
(
) 52 Nm
V10
V024
22 mm