Control, operation

Working with the machine

Setting the stanchion cylinder shut-down:

Danger!

There is a risk that the equipment may come too close to the cab due to:

–A work tool oscillating (e.g. grab) due to different dimensions of the work tool when opened and closed.

–A delay in the shut-down process. Depending on the oil temperature and equipment type, the shut-off distance can be extended by up to 0.5 m.

A minimum safety distance of at least 1.0 m to the danger object should be maintained.The machine operator is responsible for entering the correct settings!

Take this into account when setting the stanchion cylinder shut-down.

Cut-off point

For machines with a height adjustable cab, move the cab to its most forward projecting position (see Fig. 3-61). Move the equipment (boom) up as far as possible. Carefully retract industrial stanchion with appropriate attachment (grab etc.) until the required position is reached.

Set the cut-off point

Release screws 1

Push limit switch 2 to the elongated hole until the outer edge 3 of the boom cuts the voltage field of the end switch.

Tighten screws 1 again.

Check stanchion cylinder shut-down.

If necessary, repeat the setting and check again.

3.4.13Overload warning device

3.4.13.1General

The overload warning device shows the machine operator when the permissible load carrying capacity has been reached, both optically via the indicator light H16 and acoustically, via a buzzer.

The overload warning device is designed to prevent the permissible load level from being exceeded unintentionally. In this event, the working range must be reduced or the load must be set down without increasing the working range.

The overload warning device does not relieve the operator of the responsibility of lifting only known loads or permissible loads, based on the load carrying capacity of the machine.

The permissible load carrying capacity depends on the condition of the machine (undercarriage, attachment) and must be taken from the load chart in the cab.

The load carrying capacity values attain a maximum of 75% of the tipping capacity or 87 % of the hydraulic lifting power in accordance with ISO 10567.

Note!

The load values change due to the installation or removal of attachment parts and working tools.

For backhoe attachment (without the backhoe, incl. bucket cylinder, change over lever and connecting link) the values on the top of the stick apply. The machine can be turned by 360° on solid, level ground. If the bucket cylinder, change over lever and connecting link are removed, the values increase by an additional 240kg. If a quick change adapter is used, the values are reduced by 116kg (QCA33) or 225kg (QCA48).

3.4.13.2Operating principle

Danger!

When carrying out load lifting work with the machine, the applicable accident prevention regulations must be observed. The overload warning device does not shut down the machine if the permissible load level is exceeded. The machine operator is only informed of the situation.

The overload warning device consists of a simple pressure switch, which is connected to the piston side of the hoist cylinder.

If the load pressure in the hoist cylinder reaches the level of the shift pressure, the pressure switch emits a signal, the indicator light H16 lights up and the buzzer sounds.

The shift pressure in the pressure switch is selected in such a way that the stability factors can be maintained, even in unsupported condition (small stability momentum).

Installation and removal of attachment parts

3.4.13.3Operation

Danger!

No load lifting work may be carried out if the overload warning device is defective. The overload warning device must be repaired by an expert technician.

The overload warning device is activated via switch S18 in the control panel A in the right control console.

Press switch S18 down.

The overload warning device is activated. The indicator light in the switch lights up.

Note!

The overload warning device must be checked before the first use and annually by an expert technician in accordance with the inspection and adjustment guidelines provided in the service manual.

The operator must check the function of the overload warning device before each work shift.

To check the overload warning device, extend the hoist cylinder to the stop.

Continue to move the joystick in the direction Raise boom. The warning symbol must light up. The buzzer must sound.

Note!

Deactivate the overload warning device when working with a digging tool, since the increased effort of the machine will cause the overload warning device to be constantly active.

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

3.5Installation and removal of attachment parts

3.5.1Safe installation and removal of attachment parts

–Equipment and attachment parts made by other manufacturers or those which do not have LIEBHERR’s general approval for installation may not be installed on the machine without prior written approval by LIEBHERR.

LIEBHERR must be provided with the required technical documentation necessary for this purpose.

–When installing attachment parts, which are supplied via the machine's hydraulics system, such as an attachment with cylinder movement, it must be ensured that different types of oil are not mixed together. Mixing environmentally friendly hydraulic oils made by different manufacturers as well as mixing them with mineral oils must be avoided.

–Set the machine on alevel and stable ground prior to any attachment and removal of equipment parts.

–Lock the uppercarriage with the locking pin to the undercarriage.

–Do not work under the equipment as long as it does not contact the ground or prior to being supported.

–Never lie under the machine, if it is lifted by the work equipment without properly propping the machine.

–Before releasing aline or bolt, you must reduce the pressure in the hydraulic system as described in these operating instructions.

–Do not attempt to lift heavy parts. Use suitable lifting devices with sufficient load carrying capacity.

–Do not use damaged or insufficiently sized ropes or cables. Always wear work gloves when handling wire cables.

–When working on the equipment: Switch off the Diesel engine and turn the safety lever upward. Never align the holes with your fingers; use asuitable mandrel.

–During repairs: Make sure that the hydraulic lines are properly attached and that all fittings and connections are properly tightened.

–As soon as an attachment part is removed and supported, close off the openings in the hydraulic circuit to prevent dirt infiltration. Permit only authorized persons near the machine or the lifting device.

3.5.2Safe removal and installation of attachment pins

–If possible, always use a hydraulic pin pulling device to push out the pins on the attachment.

–If pins must be removed with a sledge hammer, use a punch and a guide tube held by another person.

–To drive out a pin, install the impact screw from the tool box in the threaded bore of the pin and hit the screw only.

–For the installation of a pin retained with castle nut and cotter pin, drive the pin in first to the stop, then install the castle nut by hand until contact and tighten it only to the point where the cotter pin can be installed.

Installation and removal of attachment parts

3.5.3Installation and removal of digging tool

Fig. 3-63 Installation and removal of digging tools

The following is a description of the installation and removal of digging tools. Digging tools include backhoe bucket, ditch cleaning buckets or ripper.

3.5.3.1Removing the digging tool

Position the attachment in such a way that the entire bottom part of the digging tool is laying on the ground.

Unscrew the locking plate 5 and remove the locking plate 6 and knock out pin 3 and pin 4

If necessary, raise the attachment slightly when knocking out pin 4 to relieve it.

3.5.3.2Installing a new digging tool

Position the digging tool to be installed in such a way that its entire flat bottom is laying on the ground.

Start the engine and move the attachment until the bucket stick bearing and the bearing points 1 of the digging tool are aligned.

Guide in pin 4 and secure it with plate 6.

Extend the bucket cylinder slowly until the bore hole in the connecting link 7 is located precisely between the bearing points 2

Guide in pin 3 and secure it with plate 5.

Grease all lube points on pins 3 and 4 until clean grease emerges on the corresponding bearing points.

3.5.3.3Bucket cylinder operation

Two hydraulic lines on the stick are used either for bucket cylinder operation or grapple operation.

The lines are switchable via a valve block 15: a - Bucket cylinder operation (for digging tools)

– b - Grapple operation (for grapple, scrap cutter etc.)

Turn the both square head bolts on valve block 15 in such a way that the markings are positioned transverse to the travel direction (position a, bucket cylinder operation).

Note!

If the machine is equipped with a hydraulic quick change adapter and LIKUFIX, it is not necessary to switch between bucket cylinder operation and grapple operation. There is no valve block 15

Installation and removal of attachment parts

3.5.4Installation and removal of grapple on stick

Before installing a clamshell bucket or multiple tine grab, make sure that the required hydraulic lines for grapple operation are installed on the stick.

The installation and removal of the grapple must be carried out by two people.

Danger!

Danger of injury.

Ensure that the machine operator follows the hand signal given by the guide when moving the attachment.

3.5.4.1Installing the grapple

If necessary, remove the digging tool.

Retract the bucket cylinder to the stop. Install screws 8 between connecting link 7 and the change over lever 9.

Position the grapple with fully opened shells.

Move the attachment to bring the lower mount of the stick between the bearing points of the grapple suspension 1.

Guide in pin 4 and secure it with plate 6

Connect hydraulic hose 11 and hydraulic hose 12 for the shell cylinder supply to the pipes for the bucket cylinder.

For a grapple with a hydraulic rotating grapple drive, also connect hoses 13 and 14 to the pipes for this auxiliary device.

3.5.4.2Grapple operation

Two hydraulic lines on the stick are used either for bucket cylinder operation or grapple operation.

The lines are switchable via a valve block 15:

– a - Bucket cylinder operation (for digging tools)

– b - Grapple operation (for grapple, scrap cutter etc.)

Turn the both square head bolts on valve block 15 in such a way that the markings are positioned in travel direction (position b, grapple operation).

Note

If the machine is equipped with a hydraulic quick change adapter and LIKUFIX, it is not necessary to switch between bucket cylinder operation and grapple operation. There is no valve block 15

Carry out all work movements several times without a load (open and close the shells or turn the grapple to the left and to the right) to remove any air in the hydraulic circuits.

3.5.4.3Removing the grapple

Set down the grapple on level ground with fully opened shells. Shut down the engine and, with the ignition key in the contact position, move the right joystick briefly to the left and then to the right to relieve the pressure in the hydraulic circuits.

To relieve the grapple rotator press the two push buttons in the left (or left and right – option) joystick for “Rotate grapple”.