JLG 1500SJ Service Manual - Manual (Page 428)

SECTION 5 - HYDRAULICS
5-76 – JLG Lift – 3121262
12. Remove the gauge from MS3 port and install on
MS4 port, which is on the left side of the front axle/
steer valve, closest to the left front wheel spindle.
Position the steer switch to activate the right front
steer cylinder until the rod is in the fully extended
position and hold the steer switch for a few seconds
after the rod has stopped extending. The MS4 port
should read 2000 psi (138 Bar). If the pressure is not
correct, adjust relief valve mounted next to the MS4
port clockwise to increase or counterclockwise to
decrease pressure.
13. The next step is identical to the left front step men-
tioned above. Make sure the right front wheel spin-
dle is straight and press “ENTER” to accept the new
calibration settings. Scroll over to right rear steer cal-
ibration step.
14. Checking the right rear steer cylinder is identical to
the procedure laid out for the left rear steer cylinder.
Install gauge at MS4 port of the rear axle/steer valve.
This should be at the right side of the valve closest
to the right rear wheel spindle. Position the steer
switch to activate the right rear steer cylinder until
the rod is in the fully extended position and hold the
steer switch for a few seconds after the rod has
stopped extending. The MS4 port should read 2000
psi (138 Bar). If the pressure is not correct, adjust
relief valve next to the MS4 port clockwise to
increase or counterclockwise to decrease pressure.
15. Remove gauge from MS4 port and install on MS3
port, which is on the left side of the rear axle/steer
valve, closest to the left rear wheel spindle. Position
the steer switch to activate the right rear steer cylin-
der until the rod is in the fully retracted position and
hold the steer switch for a few seconds after the rod
stops retracting. If the pressure is not 2600 psi (179
Bar), adjust the relief valve mounted next to the MS3
port clockwise to increase or counterclockwise to
decrease pressure.
16. The next step is identical to the left front step men-
tioned above, make sure the right rear wheel spindle
is straight and press “ENTER” to accept the new cal-
ibration settings, now escape out of the calibration
menu and remove the Analyzer and pressure gauge.
Adjustments Made at the Platform Valve
Bank
PLATFORM LEVEL UP
1. Install a high pressure gauge at the gauge port M2.
2. Activate level up to the end of stroke, it should read
2500 psi (172.3 Bar).
3. All the relief valves are located on the same face.
The level up relief valve is located closest to the M2
gauge port. Turn clockwise to increase, counter-
clockwise to decrease pressure.
PLATFORM LEVEL DOWN
1. Install a high pressure gauge at gauge port M1.
2. Activate level down to the end of stroke, it should
read 2000 psi (138 Bar).
3. The level down relief valve is located to the left of the
level up relief valve. Turn clockwise to increase,
counterclockwise to decrease pressure.
JIB PIN EXTEND
1. Install a high pressure gauge on gauge port MS1.
2. Using the analyzer and set pressures menu, select
jib lock pin extend. Pressure can be checked as the
jib is moved from the stowed to the work position
and should read 2500 psi (172 Bar). If adjustment is
required, turn clockwise to increase, counterclock-
wise to decrease pressure.