OM 803 us – Edition 3.7 * 803b330.fm 3-15
Operation
Jump-starting the engine (supply battery)
Safety instructions
• Never jump-start the engine if the battery of the machine is frozen – explosion hazard!
☞Dispose of a frozen battery!
• The excavator must not touch the jump-starting vehicle when connected with jump
leads – sparking hazard!
• The external power source must deliver 12 V; higher supply voltages will damage the
electrical system of the vehicles!
• Use only authorized battery jumper cables which conform to the safety requirements
and which are in perfect condition!
• The jump lead connected to the positive + terminal of the starting battery must never be
brought into connection with electrically conductive vehicle parts – short circuit hazard.
• Route the jump leads so that no one can catch on rotating components in the engine
compartment!
Procedure
☞Move the jump-starting vehicle close enough to the machine so that the jump leads can
reach to connect the two batteries
☞Let the engine of the jump-starting vehicle run
☞First connect one end of the red jump lead (+) to the + terminal of the empty battery,
then connect the other end to the + terminal of the starting battery
☞Connect one end of the black jump lead (–) to the – terminal of the starting battery
☞Connect the other end of the black cable (–) to a solid metal component fimly screwed
on the engine block or onto the engine block itself. Do not connect it to the negative ter-
minal of the empty battery, as otherwise explosive gas emerging from the battery can
ignite if sparks are formed!
☞Start the engine of the machine with the empty battery
Once the engine has started:
☞With the engine running, disconnect both jump leads in exactly the reverse order (first
remove the
– terminal, then the + terminal) – this prevents sparking in the vicinity of
the battery!
Fig. 54: Starting aid with battery jumper cables
Empty battery
Starting
battery
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