JLG 450AJ ANSI Operator Manual - Manual (Page 32)

SECTION 3 - USER RESPONSIBILITIES AND MACHINE CONTROL
3-2 – JLG Lift – 3120748
3.3 OPERATING CHARACTERISTICS AND
LIMITATIONS
General
A thorough knowledge of the operating characteristics
and limitations of the machine is always the first require-
ment for any user, regardless of the user’s experience with
similar types of equipment.
Placards
Important points to remember during operation are pro-
vided at the control stations by DANGER, WARNING,
CAUTION, IMPORTANT and INSTRUCTION placards. This
information is placed at various locations for the express
purpose of alerting personnel of potential hazards consti-
tuted by the operating characteristics and load limitations
of the machine. See FOREWORD for definitions of the
above placards.
Capacities
Raising boom above horizontal and/or extension of boom
beyond retracted position with or without any load in plat-
form, is based on the following criteria:
1. Machine is positioned on a smooth, firm and level
surface.
2. Load is within manufacturer’s rated design capacity.
3. All machine systems are functioning properly.
4. Proper tire pressure exists in the tires.
5. Machine is as originally equipped from JLG.
Stability
This machine as originally manufactured by JLG Indus-
tries Inc., when operated within its rated capacity on a
smooth, firm and level supporting surface, and in accor-
dance with the instructions provided on the machine and
this manual, provides a stable machine for all platform
positions.
Machine stability is based on two positions which are
called FORWARD STABILITY and BACKWARD STABILITY.
The machines position of least forward stability is shown
in Figure 3-1., and its position of least backward stability is
shown in Figure 3-2.
TO AVOID FORWARD OR BACKWARD UPSET, DO NOT OVER-
LOAD MACHINE OR OPERATE ON AN OUT-OF-LEVEL SURFACE.
Boom Synchronizing Procedure
If the lower boom does not fully lower, use the following
procedure.
1. Remove all personnel from the platform.
2. Pull out the red EMS (emergency stop) knob located
on the ground control station.
3. Turn the platform/ground select switch to the ground
control position.
4. If applicable, start the engine.
5. Pull and hold out the red re-level knob on the syn-
chronizing valve located beside the main control
valve.
6. From the ground controls, activate the lift control
switch, and raise the lower boom approximately 6
feet (2 m).
7. After raising the lower boom, release the red knob.
8. Activate the lift control switch and fully lower the
boom and continue to hold down the switch for an
additional 5 seconds.
9. Repeat steps 5 thru 8 if necessary.