Routine Maintenance
Electrical System
141 141
9811-3400-4
Jump Starting The Engine
T3-053
!MWARNING
Do not use a battery if its electrolyte is frozen. To
prevent the battery electrolyte from freezing, keep the
battery fully charged.
Do not try to charge a frozen battery or jump-start and
run the engine, the battery could explode.
Batteries produce a flammable gas, which is
explosive; do not smoke when checking the
electrolyte levels.
When jump-starting from another vehicle, make sure
that the two vehicles do not touch each other. This
prevents any chance of sparks near the battery.
Set all the machine switches to their OFF positions
before connecting the external power supply. Even
with the starter switch set to off some circuits will be
energised when the external power supply is
connected.
Do not connect the booster (slave) supply directly
across the starter motor. Doing this by-passes the
neutral gear safety switch. If the machine is in gear, it
may 'runaway' and kill or injure bystanders.
Use only sound jump leads with securely attached
connectors. Connect one jump lead at a time.
The machine has a negative earth electrical system.
Check which battery terminal is positive (+) before
making any connections.
Keep metal watch straps and jewellery away from the
jump lead connectors and the battery terminals - an
accidental short could cause serious burns and
damage equipment.
Make sure you know the voltage of the machine. The
booster (slave) supply must not be higher than that of
the machine. Using a higher voltage supply will
damage your machine's electrical system.
If you do not know the voltage of your booster (slave)
supply, then contact your JCB dealer for advice. Do
not attempt to jump-start the engine until you are sure
of the voltage of the booster (slave) supply.
4-2-2-3_1
1 The park brake should have been engaged when the
machine was last parked. If it is not engaged, engage
it now.
2 Set all switches in the cab to off.
!MDANGER
Before lowering the attachments to the ground, make
sure that the machine and the area around it are clear
of other people. Anyone on or close to the machine
could fall and be crushed by the attachments, or get
caught in the linkages.
2-2-3-4
3 Lower the loader shovel to the ground, if it is not
already there. It will lower itself under its own weight
when you operate the lever. Operate the lever
carefully to control the rate of descent. If your
machine is fitted with hose burst protection valves
you will not be able to lower the shovel. In this case
install the safety strut.
4 Connect the positive booster cable to the positive (+)
terminal on the machine battery. Connect the other
end of this cable to the positive (+) terminal of the
booster supply.
5 Connect the negative (-) booster cable to a suitable
point on the engine.
6 Start the engine.
!MWARNING
When the engine is running, there are rotating parts in
the engine compartment. Before disconnecting the
cables, make sure that you have no loose clothing
(cuffs, ties etc.) which could get caught in rotating
parts.
2-2-4-3
7 Disconnect the negative booster cable from the
engine. Then disconnect it from the booster supply.
8 Disconnect the positive booster cable from the
positive (+) terminal on the battery. Then disconnect
it from the booster supply.
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