JLG 450AJ Service Manual User Manual
Page 75
SECTION 2 - PROCEDURES
3120869
– JLG Lift –
2-59
Swing
1.
Remove the hoses at ports S1 and S2 on the Main
Valve and plug both hoses.
2.
Install pressure gauges into both port S1 or S2.
3.
Activate swing fully left or right. Adjust the valve to
1750 +200, -0 psi (121 +14, -0 bar).
Upper Lift Down
1.
Remove the hoses at port B2 on the Main Valve and
plug the hose.
2.
Install pressure gauges into port B2.
3.
Activate lift down and hold.
4.
The pressure gauge should read 2500 +200, -0 psi
(172 +14, -0 bar).
Platform Level Retract
1.
Remove the hose from port B1 on the Main Valve
and cap it.
2.
Install a pressure gauge into port B1.
3.
Activate the level down function and hold.
4.
The pressure gauge should read 2500 +200, -0 psi
(172 +14, -0 bar).
Telescope Relief
1.
Remove the hoses at ports TC and TR and plug.
2.
Install pressure gauges into both ports TC and TR.
3.
Activate Telescope In and Out.
4.
The pressure gauge should read 2000 +200, -0 psi
(138 +14, -0 bar).
Extend-A-Reach Relief
1.
Remove the hoses at ports J1 and J2 and plug.
2.
Install pressure gauges into both ports J1 and J2.
3.
Activate the Extend-A-Reach up and down.
4.
The pressure gauge should read 1500 ±100 psi
(103 ± 7 bar).
Steer Relief
1.
Remove the hoses at ports ST1 and ST2 and plug.
2.
Install pressure gauges into both ports ST1 and ST2.
3.
Activate the steer left and right.
4.
The pressure gauge should read 2000 ±100 psi
(138 ± 7 bar).
2.28 HYDRAULIC COMPONENT START-UP
PROCEDURES AND
RECOMMENDATIONS
From a hydrostatic component standpoint, the goal at
system start up is to put into functional operation, the
hydrostatic system in such a way as to preserve the
designed life span of the system. The following start-up
procedure should be adhered to whenever a new pump
or motor is initially installed into a machine, or a system is
restarted after either a pump or motor has been removed
and/or replaced.
THE FOLLOWING PROCEDURE MAY REQUIRE THE MACHINE TO
BE DISABLED (WHEELS RAISED OFF THE GROUND, WORK
FUNCTIONS DISCONNECTED, ETC.) WHILE PERFORMING THE
PROCEDURE IN ORDER TO PREVENT INJURY. TAKE NECES-
SARY SAFETY PRECAUTIONS BEFORE MOVING THE VEHICLE/
MACHINE.
Prior to installing the pump and/or motor, inspect the
unit(s) for damage that may have been incurred during
shipping and handling. Make certain that all system com-
ponents (reservoir, hoses, valves, fittings, heat exchanger,
etc.) are clean prior to filling with fluid.
Updated 2-16-00