JLG 1500SJ Service Manual - Manual (Page 427)

SECTION 5 - HYDRAULICS
3121262 – JLG Lift – 5-75
8. Checking the left rear steer cylinder is identical to
the procedure for left front steer cylinder, except now
we are checking pressures at the rear axle/steer
valve location. Install pressure gauge at MS1 port.
This should be located on the left side of the valve
closest to the left rear wheel spindle. MS1 port
should read 2600 psi (179 Bar) when the left rear
steer cylinder is activated with the rod in the fully
retracted position. If the pressure is not 2600 psi
(179 Bar) adjust relief valve mounted next to MS1
port clockwise to increase or counterclockwise to
decrease pressure.
9. Remove the gauge from MS1 port and install on
MS2 port, which is on the right side of the rear axle/
steer valve, closest to the right rear wheel spindle.
Position the steer switch to activate the left 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 been fully extended. The MS2 port should
read 2000 psi (179 Bar). If the pressure is not cor-
rect, adjust the relief valve mounted next to MS2 port
clockwise to increase or counterclockwise to
decrease pressure.
10. The next step is identical to the left front step men-
tioned above. Make sure the left rear wheel spindle
is straight and press “ENTER” to accept the new cal-
ibration settings, now press “ESC” (escape) and
scroll to the right front steer calibration step.
11. Checking the right front steer cylinder is identical to
the procedure laid out for the left front steer cylinder,
except the pressures are now checked at MS3 port
of the front axle/steer valve. This should be at the
right side of the valve closest to the right front wheel
spindle. Install the gauge at MS3 port. Position the
steer switch to activate the right front steer cylinder
until the rod is in the fully retracted position and hold
the steer switch for a few seconds after the rod has
been fully retracted. 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.