Maintenance
Hydraulic System
Hydraulic System
General
Discharge
WARNING Mechanically operated dozer and track controls can be hydraulically vented at any time when
the machine is switched off. Make sure that the machine is clear of bystanders otherwise they could be
injured by moving parts of the machine.
CAUTION Do not run the machine with the hydraulic tank filler cap removed.
Hydraulic Services Venting
1. Make the machine safe.
Refer to: Maintenance Positions (Page 116).
2. To remove the hydraulic pressure from the hydraulically controlled service hose line, follow the following
procedure:
2.1. Turn the ignition key to position 'I' and enter immobiliser code (if requested). Do not start the machine.
2.2. Enable the hydraulic controls.
Refer to: Control Lock (Page 43).
2.3. Operate the controls of the service(s) to be disconnected several times in both directions to release
the pressure stored in the hoses.
3. Turn the ignition key to position 0.
4. Remove the ignition key.
Auxiliary Venting
Auxiliary venting is recommended to be carried out within one minute of motor shutdown to ensure that pilot
accumulator is fully charged.
1. Make the machine safe.
Refer to: Maintenance Positions (Page 116).
2. To remove the hydraulic pressure from the electro-hydraulically controlled auxiliary service, follow the
following procedure:
2.1. Turn the ignition key to position 'I' and enter the immobiliser code (if requested). Do not start the
machine.
2.2. Enable the hydraulic controls.
Refer to: Control Lock (Page 43).
2.3. Enable the Aux function using the button on the top of left joystick.
2.4. Aux status will be displayed on the machine instrument panel and ensure that the required functions
are selected. Change Aux mode between Aux1 and Aux2 using the Aux mode select switch on the
right hand switch console, if required.
Refer to: General (Page 18).
2.5. Operate the Aux control rollers (right electro-proportional wheel control for Aux1 and left electro-
proportional wheel control for Aux2) on the joystick, fully in both directions to release stored pressure
in Aux attachment hoses.
2.6. Where the attachment has tilt/grab enabled, operate the tilt/grab changeover button and operate right
electro-proportional wheel control (for Aux1 changeover (Aux3)) for both states to ensure full venting
when attachment is installed.
3. Turn the ignition key to position 0.
4. Remove the ignition key.
138 9831/8250-4 138
JCB © Admin Pimteam - 23/06/2021 05:32.
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