Control and operation

Working with the machine

Fig. 3-93 Commutation of proportional control for an additional attachment

The additional attachment can be operated alternatively with the right mini joystick or with the left pedals. The commutation of control can be activated with the touch on the right control desk.

Press the touch.

LED in the touch illuminates.

The additional attachment is proportionally operated with the right mini joystick.

Press the touch.

LED in the touch goes out.

The additional attachment is proportionally operated with the left pedals.

3.4.15Cut-off of attachment movements (option)

The movement cut-off restricts the movements of the boom cylinder or the stick cylinder. It enables: orking height, working depth, maximal reach, minimal reach).

Danger!

The movement cut-off is not a safety device! It is only an assistance to the driver during an attachment movement near a prohibited zone!

Caution!

Danger of rocking motion of the machine and oscillations of the working tool! Avoid fast attachment movements close to a cut-off point.

Note!

The movement is only cut off to enter into the prohibited zone. The movement to leave it remains possible.

Adjustment of the movement cut-off point

At the time of the cut-off, the attachment can enter into the prohibited zone in case of oscillations of the working tool, variations of its dimensions (open/close position) or attachment inertia.

Danger! The machine driver is responsible for the adjustments precision! You must keep a safety margin of at least 1.5 m from the prohibited zone.

As soon as the proximity switch detects the reflector, the movement is cut off. The proximity switch or the reflector position is adjustable depending on the configurations.

1 Reflector

2 Proximity switch nut

3 Proximity switch

4 Rail

Bring the attachment into the desired cut-off position.

Loosen the nut 2 of the proximity switch 3 (or reflector).

Move the proximity switch 3 (or reflector) on the rail 4. Place it face to face with the reflector 1 (or proximity switch).

If the proximity switch 3 does not detect the reflector 1 when they are face to face, move them closer.

Retighten the nut 2 of the proximity switch 3 (or reflector).

Check the actual cut-off position of the attachement.

If necessary, repeat the adjustment procedure and check the cut-off position again.

Note!

If the proximity switch and the reflector are difficult to be reached in the cut-off position:

Bring the attachment in a stretched and close to the ground position. Adjust approximately the cut-off point. Correct it by successive approaches until the desired cut-off position is reached.

Unlocking of movements cut-off

Danger!

Danger of personal injury and material damage in case of attachment movements within a prohibited zone by the movement cut-off!

The operator is in any case responsible for the accidents which can occur when the movement cut-off is unlocked.

Fig. 3-95 Unlocking of movement cut-off

Bring the attachment into the cut-off position.

Turn the key switch S54 to position I.

Tilt up or down the switch S55 of the left joystick and keep it pressed. The cut-off of attachement movements is unlocked. It is possible to move the attachment within the prohibited zone as long as the switch S55 is kept pressed.

Turn the key switch S54 to position 0 The movement cut-off is actuated again.

If two movement cut-offs are fitted on the machine attachment, turn the key switch S54 to position II to unlock the second cut-off.

Note!

For the machines for the North-American market and fitted with a lifting magnet: Use the switch S5L of the left joystick to unlock the cut-off.

3.4.16Use of the excavator for lifting loads overhead

Under "lifting loads overhead" it is understood the lifting, transporting and unloading of loads requiring a securing method (ropes, chains, or other permitted lifting accessories) and where personnel are required to assist in securing and unloading the load. This includes, for example, the lifting and unloading of pipes, shaft-top supporting rings or containers.

Danger!

An hydraulic excavator may only be operated for lifting loads overhead if all the prescribed safety devices are present and functioning correctly.

In accordance with European standard EN 474-5, and so to guarantee the protections of the persons attaching or removing the loads during lifting operations, the machines used for lifting loads overhead must be equipped with the following safety devices: a load hooking system ensuring the safe attaching and removing of the loads (optional equipment) an overload warning device (optional extra)

Safe hooking systems include for example lifting hooks which are mounted in place of the bucket. Safety lifting hooks welded directly to the bucket are also allowed.

The overload warning device must alert the machine operator visually or acoustically if the permitted load value has been reached or exceeded, according to the rated lift capacity chart. a boom lowering control device (such as load check valves) to prevent unintentional lowering or dropping of the boom because of the weight of the load, which could happen if a line in this hydraulic circuit suddenly develops a leak (for example, should a hydraulic line break or a hose burst,...). a rated lift capacity chart (commonly called load chart), attached inside the cab and within the view of the operator..

This boom lowering control device must correspond with the requirements of ISO 8643.

Such a boom lowering device can be installed as an option on all models up to R924C, it is serially installed on all models R934C and above.

If the points referred to above are not or are only partially fulfilled, the machine may not be used for lifting loads overhead

Every LIEBHERR hydraulic excavator can be fitted with all the safety devices required for lifting loads operation.

Danger!

Only employ sling ropes and accessories which are permitted for lifting operation, regularly checked and in good condition.

No person may fasten or unfasten a load without approval of the operator and this person may only approach the load from one side. The operator may only approve this action when the excavator has stopped and the attachment is not moving.

Never lift loads over people.

3.4.17Overload warning system (option) Description

The overload warning system indicates to the machine operator when the maximum permitted load capacity is reached or exceeded.

The permitted load capacity depends on the configuration of the machine (undercarriage, working attachment). The maximum load capacity can be found on the load capacity chart in the operator's cab.

The load capacity values achieve a maximum of 75% of the tip load or 87% of the hydraulic lifting power according to ISO 10567.

The permissible load capacity is related to the factors that follow:

The overload warning device does not release the machine operator from the responsibility of only lifting loads that are known and within the safe working load of the machine in accordance with the load lift chart.

With the specified load, the machine can be rotated from 360° on even and horizontal ground.

Working with the machine

Check of the overload warning system

The overload warning system must be checked for correct function every time the machine is started and before load lifting work. Slowly extend the hoist cylinder to the stop. Operate the hoist cylinder to the stop. The overload warning status symbol appears on the display. An audio warning sounds in the operator cab.

If a malfunction occurs:

Do not lift loads.

Have the overload warning system repaired.

Operation of the overload warning system

DANGER!

Tipping over of the machine! The overload warning system does not shut down the machine if the permissible load torque is exceeded. The operator of the machine is only informed of the situation. Death.

Follow the safety instructions related to load lifting. Follow the instructions if the overload warning system is triggered.

Push the key S18

The overload warning system is activated. The LED of the key comes on.

If the overload warning system is triggered: overload warning status symbol is shown on the display.

Reduce the reach. or

Lower the load to the ground without increasing the reach.

Deactivation of the overload warning system

Notice

There is an increased pressure in the hydraulic cylinders during earth-moving operations!

If the overload warning system is activated, it is triggered permanently. Switch off the overload warning system for earth-moving operations.

Push the key S18

The overload warning system is deactivated. The LED of the key goes out of view.

3.4.18Adjustable hydraulic cab (option)

Two types of adjustable hydraulic cabs are available:

The

Make sure that the Diesel engine is started. Make sure that the safety lever is in the upper position.

Lifting the hydraulic cab

Danger!

Tipping over of the machine with lifted cab! Damages, injuries, death.

Make sure that no obstacle is in the path of the machine. Operate only on level and firm ground.

Make sure that the machine is stationary. Move and hold the rotary switch S200 to the left position 2 The cab lifts.

Lowering the hydraulic cab

Danger!

Crushing hazard when lowering the hydraulic cab! Injuries, death.

Make sure that nobody is in the dangerous area. Keep your arms and legs away from moving parts.

Move and hold the rotary switch S200 to the right position 1 The cab lowers.

Emergency lowering of the hydraulic cab

In case of failure, the hydraulic cab can be lowered: