OPERATOR'S MANUAL MAINTENANCE

Section 3 - Maintenance
Routine Maintenance
Electrical System
3-44 3-44
9803/JSM-0412
Jump-Starting the Engine
!MWARNING
In temperatures below freezing, the battery electrolyte
may freeze if the battery is discharged or poorly
charged. Do not use a battery if its electrolyte is
frozen. To prevent the battery electrolyte from
freezing, keep the battery at full charge.
If you 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.
Switch off all circuits which are not controlled by the
starter switch.
Do not connect the booster (slave) supply directly
across the starter motor.
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.
8-2-7-4
1 Set all Switches in the Cab to OFF.
2 Connect the Booster Cables as follows:
Note: These machines have 2 batteries which are
connected in series to give 24 volts. Use a booster supply
of 24 volts.
a Open the side panel to gain access to the
batteries.
b Connect the positive booster cable to the positive
(+) terminal on the front battery of the machine A.
c Connect the other end of this cable to the positive
(+) terminal of the booster supply B.
d Connect the negative (-) booster cable to a clean
metal part of the machine C away from and below
the battery.
Note: The connection on the machine must be free from
paint and dirt. Do not use a pivot pin for an earth.
e Connect the other end of this cable to the negative
(-) terminal on the booster supply.
3 Do the Pre-Start Checks.
4 Start the Engine.
Run the machine on Redundancy mode for ten
minutes before switching to computer mode.
5 Disconnect the Booster Cables.
a Disconnect the negative (-) booster cable from the
machine frame earth. Then disconnect it from the
booster supply.
b Disconnect the positive (+) booster cable from the
positive (+) terminal on the battery. Then
disconnect it from the booster supply.
Fig 21.