JLG 450AJ Service Manual User Manual
Page 71
SECTION 2 - PROCEDURES
3120869
– JLG Lift –
2-55
2.26 TILT ALARM SWITCH
PERFORM TILT ALARM SWITCH LEVELING PROCEDURE A MINI-
MUM OF EVERY SIX MONTHS TO ENSURE PROPER OPERATION
AND ADJUSTMENT OF SWITCH.
Manual Adjustment
7.
Park the machine on a flat, level surface. Ensure
machine is level and tires are filled to rated pressure.
NOTE: Ensure switch mounting bracket is level and securely
attached.
8.
Level the base of the indicator by tightening the
three flange nuts through approximately one quarter
of its spring travel. DO NOT ADJUST THE "X" NUT
DURING THE REMAINDER OF THE PROCEDURE.
9.
With the electrical connections complete, using bub-
ble level on top of indicator, slowly tighten or loosen
the three flange nuts until indicator is level.
10.
Individually push down on one corner at a time;
there should be enough travel to cause the switch to
trip. If the switch does not trip in all three tests, the
flange nuts have been tightened too far. Loosen the
"X" nut and repeat steps (2). through (4).
2.27 PRESSURE SETTING PROCEDURES
Proportional Sequence Valve
1.
Install a pressure gauge at port G1 on the Main
Valve and start the engine.
2.
The gauge should read between 230 and 325 psi
(16 and 22.5 bar). This valve is non-adjustable.
Bang-Bang Sequence Valve
1.
Install the pressure gauge at port G2 on the Main
Valve.
2.
Energize the main dump valve by applying 12 volts
to pin 14 at the ground control box. The gauge
should read between 230 and 325 psi (16 and 22.5
bar). This valve is non-adjustable.
P1 Main Relief Valve
1.
Install the pressure gauge at port G1 on the Main
Valve.
2.
Remove the hose from port LC. Plug the hose and
cap the fitting on the valve block.
3.
Activate Lift Up and hold.
4.
The pressure gauge should read 3000 +200, -50 psi
(207 +14, -3.5 bar).
P2 Main Relief Valve
1.
Install the pressure gauge at port G2 on the Main
Valve.
2.
Activate Tower Lift Down and hold.
3.
The pressure gauge should read 3200 +200, -50 psi
(220 +14, -3.5 bar).
X
Y
Y
Figure 2-38. Tilt Switch Adjustment
Updated 10-12-99