Maintenance
Electrical System
117 9831/0650-3 117
Where it is not possible to have an onboard battery charger installed, JCB recommend a running cycle of 1–
2h twice weekly. This exercising of the Generator Set recuperates the battery utilizing the charging alternator,
and allows the machine to maintain a healthy stand-by state.
If operating where the ambient temperature could drop below -15°C (5.0°F) remove the battery at the end of
the day and store in a warm place until required again. This will help to start the engine easily or install heating
pads and/or a battery charger if possible.
Do not jump start the battery on the generator, replace or recharge the battery as an alternative. Jump start
can create a surge of high voltage. This will cause catastrophic failure of the electronics component fitted in
the control system and engine. This failure is deemed as non-warrantable, as a result of bad practice.
Check (Charge Level)
Precautions before Charging
Follow all the precautions described below, to prevent damage to the alternator and battery.
1. Make the machine safe.
2. Make sure that the battery negative terminal is connected to the earth cable.
3. Do not connect or disconnect the battery or alternator connections, or any part of the charging circuit while
the engine is in operation. If you disregard this instruction, the regulator or rectifying diodes will be damaged.
4. Main output cables are always in active state of current flow even when the engine is not in operation. If
the alternator connector is removed, do not earth the moulded plug.
5. When you do arc welding on the machine, remove the moulded plug (or if the separate output cables are
installed, remove the cables) to protect the alternator.
6. If it is necessary to jump start the battery then do the steps below.
6.1. Connect the secondary battery in parallel without disconnecting the vehicle battery from the charging
circuit.
6.2. After the jump start, safely disconnect and remove the secondary battery.
6.3. Make sure you connect the positive terminal to the positive terminal and the negative terminal to the
negative terminal of both the batteries.
Battery Test
This test is to determine the electrical condition of the battery and to give an indication of the remaining useful
life.
Before you test the battery, make sure that the battery is at least 75% charged (Specific gravity of 1.23 to 1.25
for ambient temperature up to 27°C).
Make sure that the battery is completely disconnected from the vehicle.
Connect up the battery tester as follows:
1. Set the check load switch to off position.
2. Set the battery voltage switch to 12V.
3. Connect the red flying lead to the battery positive (+) terminal and the black flying lead to the battery
negative (-) terminal.
4. Set the check/load switch to 'check' to read the battery no-load voltage which should be at least 12.4 volts.
5. Set the check/load switch to 'load' and hold down for 5-10 seconds until the meter reading stabilises. The
reading should be at least 9 volts.
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