JLG 1100SB Service Manual - Manual (Page 258)

SECTION 5 - HYDRAULICS
5-24 – JLG Lift – 3121265
4. To make an adjustment to this pressure, go back to
the engine compartment to the function pump which
is the back pump. The high pressure relief adjust-
ment is the adjustment closest to the pump. Using a
17 mm wrench, remove the cover nut. Be careful not
to lose the O-ring washer inside the cover nut.
5. Loosen the jam nut at the setscrew with the 17 mm
wrench. Using a 3 mm allen wrench, adjust clock-
wise to increase, or counterclockwise to decrease.
6. After adjusting the pressure, tighten the jam nut and
the cover nut. This is the
maximum relief pressure
for all the functions governed by this pump.
STAND BY PRESSURE OR LOW PRESSURE RELIEF -
300 PSI (20.6 BAR)
1. Install a low pressure gauge at port MP of the main
valve block capable of reading 300 psi (20.6 bar).
2. Start the engine, the gauge should read 300 psi
(20.6 bar).
3. To make an adjustment to this pressure, go to the
engine compartment, locate the function pump. The
stand by adjustment is the adjustment outside
adjustment, closest to the turntable. Use the same
tools that were used in the Hi pressure adjustment
procedure.
Adjustments made at the Main Valve Bank
LIFT UP - 2750 PSI (189.6 BAR)
1. Install a high pressure gauge at the M5 port of the
main valve block. Plug and cap the hose on port 5.
2. Activate lift up. The gauge should read 2750 psi
(189.6 Bar).
3. The adjustment cartridge is located below the M5
gauge port. Turn clockwise to increase, counter-
clockwise to decrease.
LIFT DOWN - 1500 PSI (103.4 BAR)
1. Install a high pressure gauge at the M4 port of the
main valve block.
2. Activate lift down to the end of the stroke. The gauge
should read 1500 psi (103.4 bar).
3. The adjustment cartridge is located to the left of the
M4 gauge port. Turn clockwise to increase, counter-
clockwise to decrease.