JLG 660SJ Operator Manual - Manual (Page 60)

SECTION 4 - MACHINE OPERATION
4-2 – JLG Lift – 3121205
Stability
Machine stability is based on two positions which are called
FORWARD and BACKWARD stability. The machines position
of least FORWARD stability is shown in Figure 4-2., Position
of Least Forward Stability, and its position of least BACK-
WARD stability is shown in Figure 4-1., Position of Least
Backward Stability.
TO AVOID FORWARD OR BACKWARD TIPPING, DO NOT OVERLOAD
MACHINE OR OPERATE THE MACHINE ON AN OUT-OF-LEVEL SURFACE.
4.3 ENGINE OPERATION
NOTE: Initial starting should always be performed from the
Ground Control station.
Starting Procedure
IF ENGINE FAILS TO START PROMPTLY, DO NOT CRANK FOR AN
EXTENDED TIME. SHOULD ENGINE FAIL TO START AGAIN, ALLOW
STARTER TO “COOL OFF” FOR 2-3 MINUTES. IF ENGINE FAILS AFTER
SEVERAL ATTEMPTS, REFER TO ENGINE MAINTENANCE MANUAL.
NOTE: Diesel engines only: After turning on ignition, operator
must wait until glow plug indicator light goes out before
cranking engine.
1. Turn key of SELECT switch to GROUND. Position
POWER/EMERGENCY STOP switch to ON, then push
the ENGINE START switch until engine starts.
ALLOW ENGINE TO WARM-UP FOR A FEW MINUTES AT LOW SPEED
BEFORE APPLYING ANY LOAD.
2. After engine has had sufficient time to warm up, shut
engine off.
3. Turn SELECT switch to PLATFORM.