JLG 1850SJ Service Manual - Manual (Page 248)

SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS
5-78 – JLG Lift – 3121619
JIB LIFT DOWN
1. Install high pressure gauge at port MJA.
2. Fully retract jib lift cylinder or cap port JA . Set pressure
to 1200 psi (83bar).
3. CW increases and CCW decreases setting. Adjustment is
on the boom side of MJA.
6. Adjustments Made in Traction Circuit
CHARGE PRESSURE RELIEF
1. Install gauge 1000psi (69bar)) at port M3 on traction
pump.
2. With the drive hubs disconnected, start the engine.
3. Adjust the charge relief valve to obtain reading of 400psi
(28bar). The charge relief is located on the turntable side
of the pump above M3. Clockwise increases pressure,
Counterclockwise decreases pressure.
LOOP FLUSHING RELIEF
1. Install pressure gauge at port MP on traction valve.
2. With hubs still disconnected energize Drive, adjust loop
flushing valve to obtain gauge reading of 350psi (24bar).
Clockwise increases pressure, counter clockwise
decreases.