Control, operation

General working methods

1 Possible swivel range

3 Limit range

5 Hydraulic cylinder

3.6.2Preparation

2 Permissible working range with 10° distance to end position

4 Boom or stick

Danger!

Risk to life and limb when the machine is swivelled. Ensure that no persons are standing inside the danger area r of the machine.

Caution!

Risk of injury during work.

Always wear safety footwear. If required by the nature of the work to be carried out, wear hard hat and protective goggles.

Always wear the safety belt.

Before starting work, operate the horn to warn other workers.

Position the transport vehicle and the machine in such a way that the machine operator can properly supervise the transfer of the load.

If possible, position the machine at a higher point than the transport vehicle, in order to avoid unnecessary lifting of the load.

Lock the oscillating axle.

Extend the supports until the wheels are fully lifted from the ground.

3.6.3Working with grapples

Danger!

Risk to life and limb or damage to the machine by swinging grapple: the operator's cab and injure the operator.

ct the stability of the machine.

Prevent the grapple from swinging near the operator's cab.

Ensure that the stick is in a position where the grapple cannot collide with the machine when the excavator travels or when the brakes are applied. Move the joystick slowly and smoothly to prevent swinging of the grapple. Ensure that the moving grap ple cannot collide with persons.

Do not lift heavy loads with a fully extended boom and stick. Do not move loads to the far right or left.

Observe the load lift chart showing the permissible lift loads that can be attached to the end of the stick, depending on its actual extension.

3.6.4Loading operation

Danger!

Even when properly levelled, the machine can rock and tip over! Sinking of an outrigger below ground level would have devastating consequences!

Therefore always check whether the ground it is firm.

Carry out all movements with increased caution.

Do not travel with suspended loads. Before setting the machine into motion for travel, lower the load to the ground (empty the grapple).

Observe the load lift chart: showing the permissible lift loads that can be attached to the end of the stick, depending on its actual extension.

Fig. 3-94 Loading operation

Align the machine in a horizontal position (see chapter "Horizontal alignment of the machine").

Carefully lift the load.

Keep the load as close as possible to the undercarriage, while keeping a sufficient safety distance to the machine and the operator's cab (swinging grapple!). Move the load as low as possible above the ground.

Swivel the attachment carefully across the loading platform of the transport vehicle or across the unloading area.

Place the load on the platform (open the grapple).

Danger!

Risk to life and limb from suspended loads that become dislodged during loading onto the transport vehicle.

Do not overload the transport vehicle and ensure that the load cannot fall from the platform.

While loading the vehicle, ensure that no persons are in the danger area of the excavator or in the transport vehicle.

Never swivel the equipment over the driver's cab.

3.6.5Load lifting operation

Load lifting operation includes all manoeuvres where loads attached to the machine with lifting tackle (cables, chains, etc.) are lifted, transferred and lowered, whereby the load must be attached manually to the machine. Loading operations thus also include lifting and lowering of pipelines, shaft rings and vessels.

Danger!

The machine may only be used for lifting operations, if it is equipped with the necessary safety devices and when these devices are in proper working order.

According to the European standard EN 474-5, machines used to lift loads must be equipped with the following safety devices:

Lifting tackle that allows for the safe attachment of a load (optional equipment)

An example of a safe lifting tackle are lift hooks that are attached to the machine instead of the digging bucket. Load lift hooks may be replaced with safety hooks welded to the digging bucket.

Overload warning system (optional equipment)

If the actual load reaches or even exceeds the permissible load according to the load lift chart, the overload warning system must generate a visual and audible alarm signal to the machine operator.

Pipe fracture safety valve at the boom cylinders

The pipe fracture safety valve must conform to the requirements laid down in ISO 8643.

–Load lift chart in the operator's cab

If one or more of the above requirements is not met, the machine may not be used for load lifting operations.

3.6.6Overload warning system (optional equipment)

3.6.6.1General

The overload warning system warns the machine operator with a visual signal on the screen and an acoustic signal (warning sound) when the permissible maximum load is reached.

The overload warning system therefore helps prevent dangerous situations where the permissible load is inadvertently exceeded. In the event of a warning signal, reduce the extension of the attachment or lower the load to the ground without increasing the extension.

It remains however the responsibility of the machine operator to ensure that only loads of a known weight that is below the maximum permissible load of the machine are lifted. Always strictly adhere to the applicable accident prevention regulations. The permissible maximum load depends on the machine equipment (undercarriage, attachments) and is shown on the load table in the operator's cab.

The maximum loads indicate the load with which the uppercarriage can be rotated by 360°, provided that the machine is standing on firm and level ground.

The load lift values in the table correspond to max. 75% of the tip load or 87% of the hydraulic lifting power according to ISO10567.

If the overload warning system is defective, it is prohibited to lift loads. The system must be repaired by a specialist technician.

The overload warning system must be tested prior to the commissioning of the machine and then every year by a specialist technician, in accordance with the testing and setting installations in the service manual.

Note!

The load values also depend on any attached tools and attachments.

Note!

The overload warning system must be tested prior to the commissioning of the machine and then every year by a specialist technician, in accordance with the testing and setting installations in the service manual.

3.6.6.2Operating principle

The overload warning system consists of a pressure switch connected to the piston side of the boom cylinder.

If the hydraulic pressure in the boom cylinder reaches the limit value, the pressure switch generates a signal. As a result, a warning symbol is displayed on the screen and an audible warning sound is produced.

The chosen limit values take into account the stability factors of the machine.

3.6.6.3Start-up

Danger!

The overload warning system does not disable the machine as soon as a permissible load moment is exceeded. The operator is only informed that the limit value is exceeded.

If the overload warning system has been triggered, do not increase the load or reach.

Press the switch S18. The overload warning system is activated. The LED in the switch is on.

3.6.6.4Functional test

Before each shift, the machine operator must check whether the overload warning system is working properly:

Lift the boom and extend the boom cylinder to the stop. Continue moving the joystick in direction "lifting boom". The warning symbol must now appear on the screen. The buzzer must sound.

3.6.7Hoist cylinder warning system

Excessive stress on the working attachment can lead to a situation where the hydraulic pressure in the hoist cylinders rises very quickly to the load limit. This might for example occur if a very heavy load is moved with a large reach.

The control system monitors the load and protects the hoist cylinders against damage from excessive loads. If the maximum permissible hydraulic pressure is reached, the hoist cylinders are automatically depressurised (protective function). The working attachment is automatically lowered and the machine operator cannot stop this movement.

The hoist cylinder warning system informs the operator in advance if the protective function is about to be activated. The operator is thus made aware of possible uncontrolled movements of the attachment. The warning is given with a visual (screen symbol) and an acoustic (warning buzzer) signal.

Symbol:

Control, operation

e working attachment might suddenly be lowered.

ach of the attachment must be reduced and/or the load must be lowered to the ground without increasing the reach. Notwithstanding the hoist cylinder warning system, it is the responsibility of the machine operator to ensure that only loads of a known weight that is below the maximum permissible load of the machine are lifted. Also observe the applicable statutory accident prevention regulations.

Danger!

If the signals of the hoist cylinder warning system are ignored, the working attachment might suddenly be lowered. The machine operator might lose control of the load. Risk of accident!

If the hoist cylinder warning system is triggered, never increase the load or the reach of the attachment.

Reduce the reach and lower the load.

The hoist cylinder warning system must be tested prior to the commissioning of the machine and then every year by a specialist technician, in accordance with the testing and setting instructions in the service manual.

3.7Transport and assembly

Due to the machine weight and dimensions, the machine is normally supplied as a disassembled unit for assembly on site. To assemble the machine, follow the instructions in the assembly guidelines of LIEBHERR.

All work in connection with the assembly, dismantling and transport of the machine must be carried out by trained LIEBHERR technicians or partners authorised by LIEBHERR.

Contact the service department for instructions on how to transport, assemble and modify the machine.