SECTION 3 - CHASSIS, PLATFORM & SCISSOR ARMS
3121642 – JLG Lift – 3-1
SECTION 3. CHASSIS, PLATFORM & SCISSOR ARMS
3.1 OPERATING CHARACTERISTICS
Leveling Jacks
The machine may be equipped with auto leveling jacks. These
leveling jacks are operated through one switch unlike the tra-
ditional four switch system. The leveling jacks are operated by
a bang bang valve.
NOTE: The engine speed will drop when the leveling jacks are in
contact with the ground.
1. Activate the leveling jack button located on the plat-
form control box.
2. Extend the jacks by moving the joystick forward.
NOTE: Once all four jacks make contact with the ground the sys-
tem will go from set mode into level mode. At this point the
engine will return to idle.
3. The tilt indicator will go out once the machine is level.
NOTE: If the machine is not level it will not lift. If you hit the end of
stroke on any of the cylinders you cannot lift the machine.
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 control box will
light.
If you receive a 2/5 flash code through the system fault
light at the platform control station the machine is unable
to level. You must reposition and try again.
The jacks are operational (extend or retract) if the machine is
in the stowed position. The proximity sensor and rotary sensor
together must sense that the machine is stowed. A failure of
either sensor will prevent the jacks from being activated.
Power Deck
The power deck is operated through a non proportional valve.
This will not effect any other function when activated.
BE SURE AND RETRACT ANY POWER DECK BEFORE LOWERING MACHINE.
Generator
When the generator switch is activated, the engine RPM will
increase to 2000 RPM for a 60 Hz generator or 1700 RPM for a
50 Hz generator.
When a function is selected for operation, which requires a
higher engine speed than the generator, the generator will
automatically shut off during the operation 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 Inflation
The air pressure for pneumatic tires must be equal to the air
pressure that is stenciled on the side of the JLG product or rim
decal for safe and proper operational characteristics.
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 immediately. Arrangements
must be made for replacement of the tire or tire assembly.
For polyurethane foam filled tires, JLG Industries, Inc. recom-
mends that when any of the following are discovered, mea-
sures must be taken to remove the JLG product from service
immediately and arrangements must be made for replace-
ment 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
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