SECTION 3 - CHASSIS, PLATFORM, & SCISSOR ARMS
31215079
3-1
SECTION 3. CHASSIS, PLATFORM, & SCISSOR ARMS
3.1
OPERATING CHARACTERISTICS
Leveling Jacks (If Equipped)
The machine may be equipped with auto leveling jacks.
These leveling jacks are operated through one switch
unlike the traditional four switch system.
The leveling jacks are operated by a proportional con-
trol valve with individual cylinders controlled by bang-
bang valves.
NOTE:
Engine speed will run at high idle. Once all four jacks
contact the ground, the system will go from set
mode into level mode, then the engine will return to
idle.
OPERATION
1. Select the level function on the three-position switch
located on the platform control box.
2. Extend the jacks by moving the joystick forward and
retract by moving joystick backward.
3. Tilt Indicator will go out once machine is level.
NOTE:
If the machine is not level, it will not lift. Reaching the
end of stroke on any of the cylinders means the
machine cannot be lifted.
NOTE:
There is a limit switch on each cylinder that senses
when the cylinder is fully retracted. When all four are
fully retracted, the stowed light in the platform con-
trol box will light. If a 2/5 flash code appears through
the system fault light at the platform control station,
the machine is unable to level. Reposition the
machine and try again.
Leveling jacks are operational (extend or retract) only if
the machine is in the stowed position.
The arm stack tilt sensor and the rotary angle (elevation)
sensor work in conjunction to determine the machine is
stowed.
Failure of any of these sensors will prevent leveling jacks
operation.
Generator
When the generator switch is activated, the engine RPM
will increase to high idle.
When a function is selected for operation, which
requires a higher engine speed than the generator, the
generator will automatically shut off during the opera-
tion of the function. Once the function has stopped, the
generator will be active again.
Lift
There is a flow control valve which controls both the lift
up and lift down speeds.
Anytime you abruptly change lift directions, there is a
three second delay between lift up and lift down.
Drive
If driving at high drive up a grade and you hit an 8°
incline, the drive function will cut back to mid drive
speed. The drive pump will shift back into high drive
once the incline decreases to 5°. There will be a 2 second
delay before the machine goes back into high drive.
3.2
TIRES, WHEELS & DRIVE ASSEMBLY
Tire Damage
For pneumatic tires, JLG Industries, Inc. recommends
that when any cut, rip, or tear is discovered that exposes
sidewall or tread area cords in the tire, measures must
be taken to remove the JLG product from service imme-
diately. Arrangements must be made for replacement of
the tire or tire assembly.
For polyurethane foam filled tires, JLG Industries, Inc.
recommends that when any of the following are discov-
ered, measures must be taken to remove the JLG prod-
uct from service immediately and arrangements must
be made for replacement of the tire or tire assembly.
• A smooth, even cut through the cord plies which
exceeds 3 inches (7.5 cm) in total length.
• Any tears or rips (ragged edges) in the cord plies
which exceeds 1 inch (2.5 cm) in any direction.
• Any punctures which exceed 1 inch in diameter.
• Any damage to the bead area cords of the tire.
If a tire is damaged but is within the above noted crite-
ria, the tire must be inspected on a daily basis to ensure
the damage has not propagated beyond the allowable
criteria.
Go to
Discount-Equipment.com
to
order your
parts
