High Pressure Relief Valve Adjustments; Removal And Inspection Of Charge Pump; Torque Specs For Relief Valves Into Port Block - JLG 1200SJP Service Maintenance Manual

trol spring are correctly located in the grooves near the end of
the feedback lever arms.

High Pressure Relief Valve Adjustments

1. Remove relief valve cover from pump (ref. item 1).
2. Loosen jam screw (ref. item 2).
3. Holding spring loading nut (ref. item 4) rotate valve
spindle (ref. item 3). For high range relief valve, one turn
equals approximately 630 psi (44 bar). For low range
relief valve, one turn equals approximately 377 psi (26
bar).
4. After adjustment is completed torque jam screw (ref.
item 4) to 5 ft.lb. (7 Nm).
5. Install relief valve assembly into pump, reinstall cover
(ref. item 1) to proper torque.
Table 5-5. Torque Specs for Relief Valves into Port Block
Pump Size Wrench Size
28 32 mm
3121142

Removal and inspection of charge pump

Before removing cap screws, mark the position of the charge
pump housing and separator plate in relation to the port
block.
Loosen screws with metric allen wrench.
Remove charge pump housing and inspect for wear or dam-
age to gear set and 0-ring seals. Grease 0-rings prior to reas-
Torque
66 ft.lb. (90 Nm)
– JLG Lift –
SECTION 5 - HYDRAULICS
Pump Size Allen Wrench
8 mm
28
5-37