JLG 1850SJ Service Manual - Manual (Page 260)

SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS
5-90 – JLG Lift – 3121619
LS CONTROL SETTING
5. Install pressure gauge in port M1 to measure system
pressure. Install pressure gauge in drain port L1 or L2 to
measure case pressure. Tee-in a gauge to the LS/remote
PC signal line (port X).
6. Start prime mover and allow fluid to reach normal oper-
ating temperature. Slowly operate a hydraulic function
that will demand approximately half flow from pump,
but keep system pressure below PC set point.
7. Loosen LS set screw. While watching pressure gauges,
turn LS adjusting plug until desired pressure differential
between port M1 and port X is achieved. Clockwise rota-
tion increases setting, counterclockwise rotation will
decrease it; approximate gain = 250 psi (17 bar) per turn.
8. Holding LS adjusting plug in position. Torque LS set
screw to 5.5 - 8 ft-lb (7.5 - 10.8 Nm).
9. Operate a hydraulic function to its full extension loading
the pump at maximum pressure and zero flow.
NOTE: Set load sensing pressure with .8 mm choke OFF.
10. Loosen PC set screw and turn PC adjusting plug until
300 psi (21 bar) is indicated on pressure gauge at port
M1. Clockwise rotation increases pressure, counterclock-
wise rotation decreases it; approximate gain = 610 psi
(42 bar) per turn.
11. Holding PC adjusting plug in position. Torque PC set
screw to 5.5 - 8 ft-lb (7.5 - 10.8 Nm).
12. Stop prime mover, remove pressure gauges, and return
system to normal operating configuration.
Figure 5-118. LS Control Setting