OM ET18/20/24 us 1.3 * et18_20_24i400.fm 4-43
4
Jump-starting the engine
Explosion hazard in case of incorrect handling of the
battery!
Can result in severe injury or death.
► Never jump start the engine if the battery is frozen. Dispose of
a frozen battery.
► In order to avoid electrical short-circuit or overvoltage, the
battery jumper cable connected on the positive terminals of
the batteries must never be brought into contact with
electrically conductive vehicle parts.
► The vehicles must not touch each other during the starting
aid.
► The external power source must deliver 12 V; higher voltages
will damage the electrical system of both vehicles.
► Use only authorized battery jumper cables which conform to
the safety requirements and which are in perfect condition.
► Route the battery jumper cables so they cannot catch on
rotating components in the engine compartment.
► Do not lean over the battery.
► Keep starter sources away from the battery.
1. Travel the jump-starting vehicle close enough to the machine so that
the battery jumper cables can reach to connect both batteries.
2. Let the engine of the jump-starting vehicle run.
3. First connect one end of the red battery jumper cable (+) to the positive
terminal of the discharged battery, then connect the other end to the
positive terminal of the starting battery.
4. Connect one end of the black battery jumper cable (−) to the negative
terminal of the starting battery.
5. Connect the other end of the black battery jumper cable (−) onto a solid
metal component fimly screwed on the engine block or onto the engine
block itself.
➥ Do not connect it to the negative terminal of the discharged battery,
as otherwise explosive gas emerging from the battery can ignite if
sparks are formed.
6. Start the engine of the machine with the discharged battery.
Once the engine has started:
• With the engine running, disconnect both battery jumper cables in the
reverse order.
In order to avoid sparking, first disconnect the battery jumper
cable on the negative terminal, then the battery jumper cable on
the positive terminal.
Fig. 112: Overview
Starting
battery
Discharged battery
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