JLG 120HX Operator Manual - Manual (Page 66)

SECTION 6 - EMERGENCY PROCEDURES
6-2 – JLG Lift – 3120818
Ground Control Station
The Ground Control Station is located on the right front
side of the turntable. The controls on this panel provide
the means for overriding the platform controls, and for
controlling the platform level, boom and swing functions
from the ground. Place the SELECT switch to GROUND
position and operate the proper switch to lift, swing, or
telescope the boom, or level the platform.
Auxiliary Power
A toggle type auxiliary power control switch is located on
the platform control station and another is located on the
ground control station. Operation of either switch turns on
the electrically driven auxiliary hydraulic pump. This
should be used in case of failure of the main power plant.
The auxiliary pump will operate boom lift, telescope and
swing. To activate auxiliary power:
1. Position the platform/ground SELECT SWITCH to
PLATFORM.
2. Position the EMERGENCY STOP switch to ON.
3. Depress and hold footswitch.
4. Operate appropriate control switch, lever or control-
ler for desired function and hold.
5. Position the AUXILIARY POWER switch to ON and
hold.
6. Release the AUXILIARY POWER switch, selected
control switch, lever or controller, and footswitch.
7. Position the EMERGENCY STOP switch to OFF.
To activate auxiliary power from the ground control sta-
tion:
1. Position the platform/ground SELECT SWITCH to
GROUND.
2. Position EMERGENCY STOP switch to ON.
3. Operate appropriate control switch or controller for
desired function and hold.
4. Position the AUXILIARY POWER switch to ON and
hold.
5. Release the AUXILIARY POWER switch, and appro-
priate control switch or controller.
6. Position the EMERGENCY STOP switch to OFF.
Remote Control Box
The remote control box is located behind the left rear
access door on the turntable. To use these controls, the
engine must be running and the SELECT SWITCH must
be in the ground position.
1. Pull the POWER/EMERGENCY STOP out.
2. To steer, push the steer switch to the left or to the
right.
3. To drive, push the drive switch to forward or reverse.
4. The speed control switch controls the speed of the
drive function. Rotate the switch to increase or
decrease the drive speed.
Manual Descent
The manual descent system is used in the event of total
power failure, to lower the boom using gravity. The man-
ual descent system works as follows:
1. The boom must not be extended more than 3
meters.
2. Open the valve on the lift cylinder 1 1/2 to 2 turns
counterclockwise.
3. At the ground control, turn the SELECT SWITCH to
the ground position. Press and hold the MANUAL
DESCENT button until the boom is fully lowered.
NOTE: If the battery is dead, the manual descent system will
not work.
4. Close the valve on the lift cylinder for normal opera-
tion.
6.4 EMERGENCY OPERATION
Use of Ground/Remote Controls
KNOW HOW TO USE THE GROUND CONTROLS IN AN
EMERGENCY SITUATION.
Ground personnel must be thoroughly familiar with the
machine operating characteristics and the ground control
functions. Training should include operation of the
machine, review and understanding of this section and
hands-on operation of the controls in simulated emergen-
cies.
Operator Unable to Control Machine
IF THE PLATFORM OPERATOR IS UNABLE TO OPER-
ATE OR CONTROL THE MACHINE FOR ANY REASON:
DO NOT OPERATE WITH PRIMARY POWER SOURCE (ENGINE) IF
PERSONS ARE PINNED OR TRAPPED. USE AUXILIARY POWER
INSTEAD.
1. Operate the machine from ground controls ONLY
with the assistance of other personnel and equip-
ment (cranes, overhead hoists, etc.) as may be be
required to safely remove the danger or emergency
condition.