Control, operation

Working with the machine

Fig. 3-66 Height and side adjustable boom

To adjust the height of the boom: Move switch S241 to position 0 The indicator light H196 does not light up. Push the foot pedal k down. The adjustable boom cylinder will be extended, i.e. the attachment moves up. Push down foot pedal m. The adjustable boom cylinder will be retracted, i.e. the attachment moves down.

To adjust boom to side: Press switch S241 in position 1 (center position). The indicator light H196 lights up. Push the foot pedal k down. The boom is turned to the right. Push down foot pedal m The boom is turned to the left.

Accessory kit AHS 12 and changeover spool available

This variation is required if an attachment such as a hydraulic hammer or a scrap cutter is to be operated in addition to the adjustable boom.

To adjust the height of the boom: Press switch S241 in position 0

The indicator light H196 does not light up.

Push the foot pedal k down.

The adjustable boom cylinder will be extended, i.e. the attachment moves up. Push down foot pedal m.

The adjustable boom cylinder will be retracted, i.e. the attachment moves down.

To adjust boom to side: Press switch S241 to position 0

The indicator light H196 does not light up.

Press switch S356

Side adjustment is activated.

The indicator light in the switch lights up.

Push the foot pedal k down.

The boom is turned to the right.

Push down foot pedal m

The boom is turned to the left.

3.4.12Overload warning device

3.4.12.1General

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.

Control, operation

Working with the machine

Operating instructions

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).

3.4.12.2Operating 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).

3.4.12.3Operation

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.

Installation and removal of attachment parts

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

roval 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.

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.

of equipment parts.

ent as long as it does not contact the ground or prior to being supported. ted by the work equipment without properly propping the machine.

reduce the pressure in the hydraulic system as described in these operating instructions.

able lifting devices with sufficient load carrying capacity.

ed ropes or cables. Always wear work gloves when handling wire cables.

lever upward. Never align the holes with your fingers; use asuitable mandrel.

all fittings and connections are properly tightened.

d 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.