JLG 1850SJ Service Manual - Manual (Page 245)

SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS
3121619 – JLG Lift – 5-75
2. Activate level down to the end of stroke, the gauge
should read 2000 psi. (138bar). The level down relief
valve is the second from the top. Turn clockwise to
increase, counterclockwise to decrease.
JIB PIN EXTEND (2500 PSI [172BAR]) PRESET
1. Install a high pressure gauge at port MS1.
2. Using the analyzer and “set pressures” menu, select jib
lock pin extend. This is the bottom relief valve on the
platform valve. Turn CW to increase and CCW to
decrease pressure.
5. Adjustments Made at Jib Valve
JIB LEVEL UP
1. Install a high pressure gauge at MLB.
2. Using the analyzer, select “jib level.”
3. Using the jib level up switch, extend jib level fully or cap
port LB. Set pressure to 2600 psi.(180bar). CW increases
and CCW decreases setting. Jib level up adjustment is
adjacent to MLB.