JLG Lull 1044C-54 II Series Service Manual page 61

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1. Move the boost start machine (or auxiliary power source) close enough
to the stalled machine for the cables to reach without allowing the
machines to touch. Place the transmission shift selector in NEUTRAL,
engage the park brake, and turn off engine (or shut off auxiliary power
source).
2. On the stalled machine, turn the ignition switch to OFF.
3. Connect the positive (+) jumper cable to the positive (+) cable terminal
of the discharged battery on the stalled machine. Ensure a solid
connection. DO NOT allow positive cable clamps to touch ANYTHING
other than the battery terminal.
4. Connect the other end of the positive (+) jumper cable to the positive
(+) terminal of the boost battery (or auxiliary power source).
5. Connect one end of the negative (–) jumper cable to the negative (–)
terminal of the boost battery (or auxiliary power source).
6. Make the final connection of the negative (–) jumper cable to the frame
of the stalled machine away from the battery, fuel and hydraulic lines,
and moving parts.
7. Start the engine on the boost machine or energize the auxiliary power
source.
8. Wait at least two minutes for the battery in the stalled machine to
partially charge.
9. Attempt to start the stalled machine (see "Starting Procedures" in your
Owner/Operator Manual).
10. Immediately after the stalled machine starts, disconnect the jumper
cables in reverse order.
General Maintenance
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