JLG X390AJ Operator Manual - Manual (Page 46)

SECTION 4 - MACHINE OPERATION
4-2 – JLG Lift – 3128792
4.3 ENGINE OPERATION
NOTE: Initial starting must always be performed from the
ground controls.
The gas/diesel engine key switch on the engine must be
switched to ON, the battery disconnect switch must be ON
(see Section 4.10 on page 4-22) and power/emergency stop
buttons at the platform and ground controls must be ON
(turned clockwise) to start the engine.
Gas/Diesel Starting Procedure
NOTE: If gas/diesel 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 manufac-
turers engine maintenance manual.
NOTE: If engine is diesel, when starting a COLD engine, turn
the start key on the engine to the ON position, wait
until the GLOW plug LED (bottom) goes out before
attempting to start the engine. Turn the key and start
the engine.
1. Set the key at the Ground/Emergency Control box in
the neutral (vertical) position, then push the appro-
priate ENGINE START switch until engine starts.
NOTE: Allow gas/diesel engine to warm-up for a few minutes
at low speed before applying any load.
Figure 4-1. Ground/Emergency Control Box
1. Platform/Remote (Center)
Platform Position
2. Ground Control Position -
(Turn ClockWise and Hold)
3. Platform/Remote Ground
Maintenance Position -
(Turned CounterClockWise)
4. Gas/Diesel Engine Start
Button (1) (if equipped)
5. Electric Engine Start Button (1)
6. Enable Light
NOTE: (1) Switch at engine must be set to ON, battery disconnect
switch must be ON, and both the ground and platform emer-
gency stop switches must be set to ON.
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