Oshkosh JLG 1500SJ, Service And Maintenance Manual

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SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS
5-118 – JLG Lift – 3121262
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 High pressure adjustment procedure.
Adjustments made at the Main Valve Bank
LIFT UP
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 pressure.
LIFT DOWN
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 2000 psi (137.9 Bar).
3. The adjustment cartridge is located to the left of the M4
gauge port. Turn clockwise to increase, counterclock-
wise to decrease pressure.
SWING
NOTE: Left and right are done with one adjustment.
1. Install a high pressure gauge at port MS.
2. Lock the turntable pin.
3. Activate swing, the gauge should read 1500 psi (103.4
Bar). The adjustment cartridge is located below the MS
gauge port.
4. Turn clockwise to increase, counterclockwise to
decrease pressure.
TELESCOPE OUT
1. Install a high pressure gauge at the M8 port of the main
valve bank. Plug the telescope out hose either at the
valve bank (port #8) or at the inlet of the telescope cylin-
der (V1).
2. Activate telescope out. The gauge should read 3200 psi
(220.6 Bar).
3. The adjustment cartridge is located below the M8
gauge port. Turn clockwise to increase, counterclock-
wise to decrease pressure.
TELESCOPE IN
1. Install a high pressure gauge at the M7 port of the main
valve block. Plug the telescope in hose either at the
valve bank (port #7) or at the inlet of the telescope cylin-
der (V2).
2. Activate Telescope In. The gauge should read 1800 psi
(124 Bar).
3. The adjustment cartridge is located to the left of the M7
gauge port. Turn clockwise to increase, counterclock-
wise to decrease pressure.
Adjustments Made at the Frame Valve Bank
AXLE EXTEND AND RETRACT, FRONT AND REAR
1. To extend the axles, drive the machine back and forth
until fully extended. A machine that cannot be driven
must be jacked up.
2. On both the front and rear frame valve banks, install a
high pressure gauge on ports MA1 for extend and MA2
for retract. The gauge should read 2500 psi (172.3 Bar) in
both directions.
3. The axle extend/retract cylinders are connected hydrau-
lically in parallel. In order to get the correct pressure of
the circuit being adjusted, unscrew the solenoid coil
from the circuit not being adjusted and pull it away from
the valve.
4. Turn clockwise to increase, counterclockwise to
decrease pressure.
REXROTH PUMP
SAUER PUMP