Maintenance
Hydraulic System
147 9821/6100-4 147
Hydraulic System
General
Discharge
CAUTION Allow the hydraulic fluid temperature to cool before removing the hydraulic tank filler cap. Open
the cap slowly to prevent oil being forced out of the filler neck.
CAUTION Do not run the engine with the hydraulic tank filler cap removed.
1. Make the machine safe.
2. Operate the controls to remove the hydraulic pressure from the service hose lines
2.1. For manually operated services, operate the controls (several times) of the service(s) to be
disconnected.
2.2. For electrical services, turn the ignition key to position 1. Operate the controls (several times) of the
service(s) to be disconnected. Press the relevant console switch (to make the relevant service active).
3. Turn the ignition key to position 0.
4. Remove the ignition key.
5. Carefully remove the hydraulic tank filler cap to vent residual tank hydraulic pressure.
6. Install the hydraulic tank filler cap.
Check (Condition)
Hydraulic Hoses
WARNING Damaged hoses can cause fatal accidents. Examine the hoses regularly. Do not use the machine
if a hose or hose fixture is damaged.
Examine the hoses for:
• Damaged hose ends
• Worn outer covers
• Ballooned outer covers
• Kinked or crushed hoses
• Embedded armouring in the outer covers
• Displaced hose end fittings.
Replace a damaged hose before you use the machine again.
The replacement hoses must be of the same size and standard. If necessary, for more information contact
your JCB dealer.
Accumulator
1. Stop the machine on solid, level ground.
2. Raise the boom and extend the dipper.
Refer to: Operating Levers/Pedals (Page 58).
3. Stop the engine. Do not raise the controls isolation lever.
Refer to: Safety Equipment (Page 49).
4. Lower the boom. Stop the boom several metres from the ground.
5. Lower the boom to the ground.
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