JLG 1350SJP Service Manual - Manual (Page 350)

SECTION 5 - HYDRAULICS
5-26 – JLG Lift – 3121142
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 adjustment 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 clockwise 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 adjust-
ment, 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, counterclock-
wise 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, counterclock-
wise to decrease.