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 grapple can collide with and damage the operator's cab and injure the operator.

–The grapple can also injure other persons.

–A swinging grapple can also affect 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.

3.6.4Excavating and moving material with grapples

Put the machine into its working position.

Align stick (1):

Open the claws fully.

Lower the stick vertically to excavated area.

Danger!

When being closed, the clamshell bucket might lift the machine. As a result, the machine might inadvertently roll away.

Closing jaws (2): Close the jaws.

Avoid situations where the machine could become unstable by lifting the equipment sufficiently before closing the grapple.

Lift the stick only slightly in order to relieve the pressure on the ground.

To lift excavated material (3): Close the jaws.

Lift the boom.

Move the machine to the unloading area (e.g. transport vehicle).

Swivel the stick as far possible in order to prevent any risk from the slewing bucket.

Open the jaws and release the excavated material.

3.6.5Loading operation

Danger!

There is always a risk that the hydraulic excavator might topple over! Subsiding of the supports could have disastrous consequences!

Always inspect the bearing surface of the supports (load-bearing capacity of the ground).

All machine movements must be controlled with particular care.

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.

Note!

Maximum lifting capacity is given, when the load is taken up as closely as possible near the undercarriage.

Carefully lift the load.

Keep the load as close as possible to the undercarriage, while keeping a sufficient safety distance to the operator's cab (swinging grapple!). Keep the load as near as possible to the ground when moving.

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.

Caution!

Especially when moving timber, it might be necessary to move the machine while the loaded attachment is lifted. In this case, the centre of gravity of the machine is shifted vertically and thus higher than normal. The travel behaviour of the machine is greatly affected by this.

Observe the instructions in chapter "Safe use of machine for goods handling".

3.6.6Load 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.

3.6.7Use of quick-change adapter for load lifting operation

1 Load lift hook

2 Lifting tackle

3 Hook for working tool (not suitable for load lifting operation)

The quick-change adapter is equipped with two integrated load lift hooks for lifting operation.

The maximum lifting capacity of the individual load lift hooks is indicated at the quickchange adapter. The load capacity might be below or above that of the basic machine. Always observe the load capacity values of the machine.

Load-lifting work can be carried out with or without an attached working tool. If a working tool is mounted and the machine is used to lift loads, we recommend fully retracting the locking pins. This prevents that the lifting tackle is deflected by the locking pins, as this could cause damage.

A Permissible swivelling range Danger!

If a load is lifted incorrectly, it might become dislodged, which in turn could result in serious accidents.

To lift loads, always use the load hooks 1 and never the hook for the working tool.

Adjust the quick-change adapter position so that the load hook 1 opens upwards and is within the permissible swivel range A

Attach the load to the load hook according to the instructions in chapter "lifting operation".

3.6.8Overload warning system (optional equipment)

3.6.8.1Introduction

The overload warning system warns the machine operator with a visual signal (indicator light overload warning) and an acoustic signal (buzzer 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.

The permissible maximum load depends on the machine equipment (undercarriage, attachments) and is shown on the load table in the operator's cab.

The load lift values in the table correspond to max. 75% of the tip load or 87% of the hydraulic lifting power according to ISO 10567.

In machines equipped with a backhoe bucket attachment (without backhoe bucket, including bucket cylinder, change lever and connecting link), the values are applicable to the tip of the stick. When the machine is standing on firm and level ground and the oscillating axle is locked, the uppercarriage can be swivelled by 360°.

Note!

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

If the bucket cylinder, change lever and connecting link are removed, the load values are increased by approx. 240kg.

When using a quick-change adapter or working tools, deduct the weight of the components from the load values (see LIEBHERR type plate).

3.6.8.2Functional description

Danger!

When operating the machine to lift loads, always adhere to the relevant safety and accident prevention regulations. 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.

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

If the load pressure in the boom cylinder reaches the switching pressure, the pressure switch generates a signal. This signal switches on the overload warning indicator light and triggers the buzzer sound.

The switching pressure of the pressure switch is set in such a way that the stability of the machine is not compromised, even if it is not supported.

3.6.8.3Start-up

Danger!

Risk of injury. If the overload warning system is defective, it is prohibited to lift loads. Employ a specialist technician to repair the overload warning system.

The overload warning system is activated by means of the switch S318

Press the switch S18 down.

The overload warning system is activated. The indicator light in the switch is on.

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.

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

Extend the boom cylinder to the stop (lifting boom).

Continue moving the joystick in direction "lifting boom".

The indicator light of the overload warning system must be on. The buzzer signal must audible.

Note!

Deactivate the overload warning system when working with a digging bucket, as the great force used for such operations would constantly trigger the overload warning system.

Press the switch S18 up. The overload warning system is deactivated. The indicator light in the switch is off.

3.6.8.4Acknowledging buzzer signal (warning signal)

After the working tool has been removed, the buzzer (warning signal) sounds as long as the system is not locked.

If the overload warning system is switched on, the warning buzzer can be acknowledged.

If no working tool is to be mounted, it is useful to deactivate the warning signal. This is also recommended to ensure that another buzzer sound (i.e. from the overload warning system) is actually audible.

Press the switch S360

The buzzer is switched off. The "quick-change adapter" icon remains displayed.

Note!

The acoustic warning signal is automatically reactivated when the system is locked again.

In order to activate the warning buzzer, lock the system once. The buzzer and warning sound are on at the next release process.