Control and operation

Operating the excavator in safety modes

Fig. 3-96 Device for emergency supply of the boom cylinders

Connecting an external pressure source

The fittings for connection and the shut-off valves of the emergency supply device are installed on the lower part of the boom, on the right side.

Loosen the box nut and the taper collet at the T-coupling 8U or 8D and connect the pressure source to the T-coupling.

Note

When the pressure from the external source increases, the pressure automatically increases in the servo control circuit of the machine, even if the shut off valves 5U and 5D are left in the closed position.

Raising the working attachment

The external pressure source must be connected to the T-coupling 8U.

Move the safety lever to the lower position and turn the ignition key to "contact" position.

Open the shut off valve 5U: line up the manoeuvring lever of the valve with the hydraulic line.

Carefully actuate the joystick for the boom cylinders in the direction for lifting the working attachment until the attachment has reached the desired position.

Lowering the working attachment

The external pressure source must be connected to the T-coupling 8D

Move the safety lever to the lower position and turn the ignition key to "contact" position.

Carefully actuate the joystick for the boom cylinders in the direction for lowering the working attachment until the attachment has reached the desired position.

Open the shut off valve 5D: line up the manoeuvring lever of the valve with the hydraulic line.

After ending the attachment movement with the external pressure source

Close the shut off valves 5 immediately: turn the manoeuvring levers of the valves crosswise to the hydraulic lines.

Check the oil level in the hydraulic tank, correct the level as necessary. Disconnect the external pressure source.

3.6Recovering, towing the machine

3.6.1Towing with the machine, emergency towing of the machine

As well the towing of another machine with the excavator as the emergency towing of the excavator are difficult and problematic operations which are always realized under is the responsibility of the owner of the machine.

Damages or accidents, that could occur when towing another machine with the excavator or when emergency towing the excavator cannot be covered by the manufacturer's guarantee under any circumstances.

Towing and lashing hooks and eyes on the undercarriage

The hooks and eyes mounted to the undercarriage central piece are destined for the anchoring of the excavator during transportation, resp. for towing smaller machines or vehicles.

Always notice the indication for the maximum authorized pulling force on the hooks 3 or on the eyes 4.

Always expect a maximum pulling force of 10 tons for hooks which are welded to the undercarriage central piece and which show no indication.