JLG 120HX Operator Manual - Manual (Page 52)

SECTION 4 - MACHINE OPERATION
4-2 – JLG Lift – 3120818
4.3 ENGINE OPERATION
NOTE: Initial starting should always be performed from the
Ground Control station.
Starting Procedure
1. Check engine oil. If necessary, add oil in accor-
dance with the Engine Manufacturer’s manual.
2. Check fuel level. Add fuel if necessary.
3. Check that air cleaner components are in place and
securely fastened.
IF ENGINE FAILS TO START PROMPTLY, DO NOT CRANK FOR AN
EXTENDED PERIOD. SHOULD ENGINE FAIL TO START ONCE
AGAIN, ALLOW STARTER TO “COOL OFF” FOR 2-3 MINUTES. IF
ENGINE FAILS AFTER SEVERAL ATTEMPTS, REFER TO ENGINE
MAINTENANCE MANUAL.
4. Position the SELECT SWITCH to ground. Position
the POWER/EMERGENCY STOP switch to ON, then
push the START switch until engine starts.
ALLOW ENGINE TO WARM-UP FOR A FEW MINUTES AT LOW
SPEED BEFORE APPLYING ANY LOAD.
5. After engine has had sufficient time to warm up, shut
engine off.
6. Position SELECT SWITCH to PLATFORM.
7. From Platform position IGNITION switch to ON, then
push the START switch to the forward position until
engine starts.
NOTE: The footswitch must be in released (up) position
before starter will operate. If starter operates with
footswitch in the depressed position, DO NOT
OPERATE THE MACHINE.
Shutdown Procedure
IF AN ENGINE MALFUNCTION NECESSITATES UNSCHEDULED
SHUTDOWN, DETERMINE AND CORRECT CAUSE BEFORE
RESUMING ANY OPERATION.
1. Remove all load and allow engine to operate at low
speed setting for 3-5 minutes; this allows for further
reduction of internal engine temperature.
2. Position POWER/EMERGENCY STOP switch to OFF.
3. Turn the SELECT SWITCH to OFF position.
NOTE: Refer to Engine Manufacturer’s manual for detailed
information.
4.4 TRAVELING (DRIVING/STEERING)
DO NOT DRIVE WITH BOOM EXTENDED OR ABOVE HORIZONTAL
EXCEPT ON A SMOOTH, FIRM AND LEVEL SURFACE.
TO AVOID LOSS OF TRAVEL CONTROL OR UPSET ON GRADES
AND SIDE SLOPES, DO NOT DRIVE MACHINE ON GRADES OR
SIDE SLOPES EXCEEDING THOSE SPECIFIED ON SERIAL NUM-
BER PLATE.
ASSURE THAT TURNTABLE LOCK IS ENGAGED BEFORE BEGIN-
NING ANY EXTENDED TRAVELING. AVOID ANY TERRAIN FEA-
TURES WHICH COULD CAUSE THE MACHINE TO UPSET.
USE EXTREME CAUTION WHEN DRIVING IN REVERSE AT ALL
TIMES WHEN DRIVING WITH PLATFORM ELEVATED AND ESPE-
CIALLY WHEN DRIVING WITH ANY PART OF MACHINE WITHIN 2
METERS OF AN OBSTRUCTION. DO NOT USE DRIVE TO MANEU-
VER PLATFORM CLOSE TO AN OBSTRUCTION....USE ONE OF
THE BOOM FUNCTIONS.
BEFORE DRIVING, MAKE SURE BOOM IS POSITIONED OVER
REAR AXLE. IF BOOM IS OVER FRONT AXLE (STEER WHEELS),
STEER AND DRIVE CONTROLS WILL MOVE IN OPPOSITE DIREC-
TIONS TO MACHINE CONTROLS.
Traveling Forward or Reverse
1. With engine running, depress footswitch and posi-
tion DRIVE/STEER control forward and hold for the
duration of forward travel desired.
2. Depress footswitch and pull the DRIVE/ STEER con-
trol back to reverse and hold for duration of reverse
travel desired.
NOTE: When boom is above horizontal, the DRIVE function
will be in CREEP mode.
NOTE: When machine exceeds 3 degree slope, DRIVE
functions will be cut out, and SWING and LIFT are in
CREEP mode if boom is above horizontal.
3. Position the STEER thumb rocker to the right for
traveling right and left for traveling left.
4. To obtain maximum travel speed, make sure the
boom is positioned below horizontal and position
the DRIVE controller to fast.