JLG 120HX Operator Manual - Manual (Page 35)

SECTION 3 - USER RESPONSIBILITIES AND MACHINE CONTROL
3120818 – JLG Lift – 3-5
3.4 CONTROLS AND INDICATORS
Precision Control Governor
This control allows the engine to remain at idle until any
function is activated, at which time the engine will acceler-
ate to perform that function. Upon release of the function
the engine will accelerate back to idle. High engine can
only be obtained if the drive handle is placed in the
extreme drive position, if the high engine switch is ON and
the boom is horizontal or below.
Ground Controls
Some machines are equipped with control panels that use
symbols to indicate control functions. Refer to Table 3-1
for these symbols and their corresponding functions.
DO NOT OPERATE FROM THE GROUND STATION WITH PERSON-
NEL IN THE PLATFORM EXCEPT IN AN EMERGENCY.
PERFORM PRE-OPERATIONAL CHECKS AND INSPECTIONS
FROM THE GROUND CONTROL STATION. WHEN PERSONNEL
ARE IN THE PLATFORM, OPERATION OF THE BOOM WILL ONLY
BE PERFORMED WITH THE PERMISSION OF THE PLATFORM
OCCUPANT(S).
WHEN THE MACHINE IS SHUT DOWN THE MASTER/EMERGENCY
STOP SWITCH MUST BE POSITIONED TO THE “OFF” POSITION
TO PREVENT DRAINING THE BATTERY.
1. Power / Emergency Stop Switch.
The two position POWER/EMGENCY STOP switch
furnishes battery power to the platform or ground
control switches when station power is selected
from the ground control panel. Push in to shut off
the engine and remove power from the controls. The
ground control emergency stop switch must be
pulled out to operate the machine from either the
Ground Control or Platform Control.
2. Control Station Selector.
A three position, center off, key activated SELECT
SWITCH supplies power to the platform control con-
sole when positioned to PLATFORM. With the switch
in the GROUND position, power is shut off to the
platform station, and only the controls on the ground
control panel are operable.
NOTE: With the Platform/Ground Select Switch in the center
position, power is shut off to controls at both operat-
ing stations.
TO AVOID SERIOUS INJURY, DO NOT OPERATE MACHINE IF ANY
CONTROL LEVERS OR TOGGLE SWITCHES CONTROLLING
PLATFORM MOVEMENT DO NOT RETURN TO THE OFF POSITION
WHEN RELEASED.
3. Start Button.
The START button is a momentary contact, push
button type switch that supplies electrical power to
the starter solenoid, when the POWER/EMER-
GENCY STOP Switch is pulled out and the SELECT
SWITCH is in the Ground position. Push and hold
the button until the engine starts.
NOTE: One of the capacity indicator lights should be illumi-
nated at all times during operation. If no capacity
lights are on, a bulb is probably burned out. Opera-
tion of the machine must be halted until the lights are
working properly.
4. Capacity Indicator.
The capacity indicator displays to the operator the
maximum rated platform capacity and the maximum
radius for that capacity using colored lights and a
reach diagram. The operator must not exceed the
rated capacity or the rated radius for the load (per-
sonnel, tools, and supplies) shown on the indicator.
The blue light indicates operating within 500 lb.
range. A steady red light indicates you have
exceeded the machines operating radius. You must
immediately stop and ‘’LIFT UP’’ or ‘’TELE IN’’ until
the red light goes out. A blinking red light and a
buzzer sounding indicates you have exceeded the
platform load capacity (personnel, tools, and sup-
plies) or operating radius. You must immediately
stop and ‘’LIFT UP’’ or ‘’TELE IN’’ until the red light
goes out and the buzzer stops. Check to make sure
the load in the platform does not exceed the rated
capacity.
NOTE: Lift, Swing, and Telescope control switches are
spring-loaded and will automatically return to neutral
(off) when released.
WHEN OPERATING THE BOOM ENSURE THERE ARE NO PER-
SONNEL AROUND OR UNDER PLATFORM.
5. Lift Control (Main Boom).
The three-position LIFT control switch provides rais-
ing and lowering of the main boom when positioned
up or down.