JLG 120HX Operator Manual - Manual (Page 25)

SECTION 2 - PREPARATION AND INSPECTION
3120818 – JLG Lift – 2-9
2.5 DAILY FUNCTIONAL CHECK
THE LOAD MANAGEMENT SYSTEM AND THE AXLES (PROPER
EXTENSION AND RETRACTION) MUST BE CHECKED PRIOR TO
ANY OTHER SYSTEMS AND/OR FUNCTIONS.
A functional check of all systems should be performed,
once the walk-around inspection is complete, in an area
free of overhead and ground level obstructions. First,
using the ground controls, check all functions controlled
by the ground controls. Next, using the platform controls,
check all functions controlled by the platform controls.
TO AVOID SERIOUS INJURY, DO NOT OPERATE MACHINE IF ANY
CONTROL LEVERS OR TOGGLE SWITCHES CONTROLLING
PLATFORM MOVEMENTS DO NOT RETURN TO THE OFF OR NEU-
TRAL POSITION WHEN RELEASED.
TO AVOID COLLISION AND INJURY IF PLATFORM DOES NOT
STOP WHEN A CONTROL SWITCH OR LEVER IS RELEASED,
REMOVE FOOT FROM FOOTSWITCH OR USE EMERGENCY STOP
TO STOP THE MACHINE.
NOTE: Perform checks from ground controls first, then from
platform controls.
1. Axle Extension System.
a. Remove pins from steer cylinder and tie rod of
rear axle.
b. Activate hydraulic system from ground controls.
c. Using the controls on the frame, lower the jack
cylinder to raise the rear axle. When wheels are
off the ground, extend axle completely by mov-
ing axle switch to the left.
d. Reinstall the pins in the steer cylinder and tie rod
and lower the rear axle by raising the jack cylin-
der completely.
e. Remove the pins from the steer cylinder and tie
rod of the front axle.
f. Using the controls on the frame, lower the jack
cylinder to raise the front axle. When the wheels
are off the ground, extend the axle completely
by moving the axle switch to the left. The green
AXLES SET indicator light will illuminate when
the axles are fully extended.
g. Reinstall the pins in the steer cylinder and tie
rod, and lower the front axle by raising the jack
cylinder completely.
h. Shut down the hydraulic system as required.
2. Load Management System Functional Check.
a. Activate the hydraulic system from the ground
controls. The blue light should illuminate when
the SELECT SWITCH is in the ground position,
the EMERGENCY STOP switch is pulled out,
and the boom is retracted.
b. With the boom fully retracted, raise the boom to
horizontal.
c. Position the toggle switch located on the right
side of the ground control box to the P position
and hold.
d. Extend the boom until the red marking band on
the inner mid section is exposed from the base
section. The red light should illuminate at this
point.
e. Continue extending the boom until the white
marking band on the inner mid section is
exposed from the base section. The red light
should blink and an audible alarm sound. Also
the telescope out and lift down will not function
in this mode. Release the toggle switch.
f. Extend the boom. The boom must stop on the
white band on the mid boom section. Release
the toggle switch.
g. Retract the boom until tele out will function. The
system is now reset.
h. Position the toggle switch to the M position and
hold.
i. Repeat step e.
TIPOVER HAZARD
IF THE RED LIGHT DOES NOT BLINK, THE ALARM DOES NOT
SOUND, THE BOOM CONTINUES TO TELESCOPE BEYOND SEC-
OND MA RK IN G BA ND , IF TH E BOOM CA N BE LOWERED,
RETRACT THE BOOM, IMMEDIATELY SHUT DOWN MACHINE AND
CONTACT A QUALIFIED SERVICE PERSON.
3. Drive forward and reverse; check for proper opera-
tion.
4. Steer left and right; check for proper operation.
5. Check rear steer left and right for proper operation.