JLG 450AJ Operator Manual - Manual (Page 51)

SECTION 4 - MACHINE OPERATION
3120868 – JLG Lift – 4-5
Raising and Lowering the Main (Upper)
Boom
NOTE: Lift up will not function when the boom is near full
elevation and the platform is out of level.
To raise or lower the Main (Upper) Boom, with footswitch
activated, position Upper Boom Lift switch to UP or
DOWN until desired height is reached.
Telescoping the Main Boom
To extend or retract the main boom, with the footswitch
activated, position the Main Telescope Control Switch to
the in or out position and hold until the platform reaches
the desired position.
4.9 LIFT UP AND PLATFORM LEVEL DOWN
DISABLE SWITCH FUNCTIONAL CHECK
The purpose of the disable switch is to prevent lift up
when the boom is near full elevation and the platform is
out of level.
DISABLE SWITCH FUNCTIONAL CHECK MUST BE PERFORMED
QUARTERLY, ANY TIME A SYSTEM COMPONENT IS REPLACED,
OR WHEN IMPROPER SYSTEM OPERATION IS SUSPECTED.
1. Tape a small piece of metal to the end of the limit
switch (e.g. a coin).
2. Using the controls in the platform basket, test the lift
up and platform level down functions. Both opera-
tions should be locked out and not function.
3. Remove metal (coin) and return machine to service.
4.10 SHUT DOWN AND PARK
4. Drive machine to a protected area.
5. Assure main boom is fully retracted and lowered
over rear (Drive) axle; all access panels and doors
closed and secured.
6. Remove all load and allow engine to operate 3-5
minutes at LOW setting to permit reduction of
engine internal temperatures.
7. At Ground Controls, turn KEY SELECT switch to
(center) OFF. Position, POWER/EMERGENCY STOP
switch (down) to OFF. Remove key.
8. Cover Platform Control console to protect instruction
placards, warning decals and operating controls
from hostile environment.
4.11 TIE DOWN AND LIFTING
When transporting machine, boom must be in the stowed
mode and machine securely tied down to truck or trailer
deck. Four tie down eyes are provided in the frame slab,
one at each corner of the machine. (See Figure 4-3. and
Figure 4-4.)
If it becomes necessary to lift the machine using an over-
head or mobile crane, it is very important that the lifting
devices are attached only to the designated lifting eyes.
(See Figure 4-5. Lifting Chart)
NOTE: Crane and lifting devices, chains, slings, etc., must
be capable of handling at least:
450A - 2WD (pneumatic tires) - 6668 kg. (14,700 lbs.)
450AJ - 2WD (pneumatic tires) - 7030 kg. (15,500 lbs.)
450A - 2WD (foam-filled tires) - 6985 kg. (15,400 lbs.)
450AJ - 2WD (foam-filled tires) - 7122 kg. (15,700 lbs.)
ABOVE ARE MINIMUM WEIGHTS. CHECK WEIGHT OF UNIT
PRIOR TO LIFTING.
NOTE: Lifting eyes are provided at the front and rear in the
frame slab. Each of the four chains or slings used for
lifting machine must be adjusted individually so
machine remains level when elevated.
CONTACT PLATE
PROXIMITY SWITCH
COIN
Figure 4-2. Functional Check