JLG 1250AJP Service Manual - Manual (Page 408)

SECTION 5 - HYDRAULICS
5-54 – JLG Lift – 3121171
4. Remove the circular covers at the side or square
cover at the top to gain access to the axle/steer
valves.
5. Install a pressure gauge at the front axle/steer valve
at MS2 port. This should be located on the left side
of the valve closest to the left front wheel spindle.
Position the steer switch to activate the left front
steer cylinder until the rod is in the fully extended
position and hold the switch for a few seconds after
the rod has been fully extended. The MS2 port
should read 2000 psi (138 Bar). If the pressure is not
2000 psi (138 Bar) adjust relief valve mounted next
to the MS2 port, CW to increase or CCW to
decrease.
6. Remove the pressure gauge from MS2 port and
install on the MS1 port, which is on the right side of
the front axle/steer valve, closest to the right front
wheel spindle. Position the steer switch to activate
the left front steer cylinder until the rod is in the fully
retracted position and hold the switch for a few sec-
onds after the rod has stopped. The MS1 port
should read 2600 psi (179 Bar). If the pressure is not
correct, adjust relief valve next to MS1 port, CW to
increase or CCW to decrease.
7. This step involves aligning the left front wheel spin-
dle with the axle weldment. Position the left front
wheel spindle “straight” using a square and rule or
string for proper alignment (Refer to Section 6 - JLG
Control System). Once the left front wheel spindle
has been properly measured, press “ENTER” on the
Analyzer. This is calibrating data to the JLG Control
System that the left front steer sensor is centered.