Malfunctions

Problems and remedies

Problem / errorCauseRemedy

Engine is stallingNo performance setting via proportional solenoid valve Y50

Unplug cable of Y50 connection, remove cotter pin, move lever to emergency setting

Hydraulic oil temperature too highRadiator contaminatedClean radiator

Fan or fan control defectiveRemedy error / consult LIEBHERR Service

Hydraulic oil level too lowOil lossRepair leaks, replace hoses, add oil via return filter

No travel functionRaise safety leverLower safety lever

No travel direction preselectedDetermine travel selection switch via travel selector switch in right joystick

Pressure switch - parking brake defective Consult LIEBHERR Service

Parking brake not releasedRelease parking brake via switch

Parking brake will not release despite pressing the switch

Servo pressure available: Actuate emergency function Y6

Servo pressure not available: Consult LIEBHERR Service

Operating brake engagedRelease operating brake

Swing gear not functioningNo servo controlLower safety lever

Turn on servo control

Swing brake activatedLower safety lever

Release swing brake No

Turn on servo control

4.2.3Travel gear

Problem / errorCauseRemedy

Machine does not move, neither forward nor backward

Safety lever is raised

Parking brake has been applied via switch S16

No travel direction preselected Apply operating brake, using brake pedal and retainer

Machine moves too slowlyIncorrect gear reduction via switch S42.

Creeper gear activated via switch S21. Travel pedal cannot fully shift through.

Lower the safety lever. Release parking brake using switch S16. Preselect direction of travel using switch S30.

Release operating brake by releasing the retainer. Consult LIEBHERR Service.

Select a different reduction via switch S42.

Deactivate creeper gear via switch S21.

Clean cab floor. Consult LIEBHERR Service.

4.2.4Electrical system

Problem / errorCauseRemedy

Battery charge indicator light does not turn off

Batteries do not charge or charge insufficiently

Indicator light or display instrument not functioning or functioning incorrectly

Some or all functions on instrument panel malfunction

Engine throttle control not functioning

V- belt for alternator loose or tornTension or replace V-belt Alternator defectiveReplace alternator

Batteries defectiveReplace batteries

Battery connections dirty / oxidizedClean battery connections

Cable loose or damagedConnect or replace cable

Bulb burnt out, display instrument defective

Plug connector separated or damaged, ground lead interrupted, short circuit - fuse defective

Excavator electronic for throttle control not functioning.

Sensor controlled low idle automatic is activated.

Replace defective part

Install plug connector correctly or change, repair short circuit, replace fuse or activate circuit breakers

Consult LIEBHERR Service

Joystick or deactivate switch S20 for sensor controlled low idle automatic. Consult LIEBHERR Service

No signal coming from RPM sensorConsult LIEBHERR Service

Sensor controlled low idle automatic not functioning, RPM does not drop

Servo control cannot be activated via switch

Parking brake cannot be released with the switch

Swing gear brake cannot be released with the switch

Permanent sensor signal

Consult LIEBHERR Service

Switch S20 is deactivatedActivate switch S20

Switch defective Problem in excavator electrical system

Replace switch Consult LIEBHERR Service

4.2.5Heating and Air conditioning system

Problem / errorCauseRemedy

Heater does not supply warm airS hut off valves for coolant line on Diesel engine closed

Open shut off valve

Engine not at operating temperatureBring engine to operating temperature

Heater fan is not runningNo power supplyCheck fuse and wiring / repair

Fan motor defectiveChange fan motor

Only low air flow in cabOutside air filter / recirculated air filter dirty

Clean air intake opening, replace outside air filter

Air vent closedOpen air vent

Malfunctions

Fuses and relays

4.2.6Work attachment

Problem / errorCauseRemedy

Cylinder gives way under loadPiston seal in cylinder defectiveOverhaul cylinder

Bearing clearance too high on attachment

Bearing points worn outReplace bearing parts

Grapple / bucket do not moveValve block on bucket cylinder incorrectly switched Change over valve block

Attachment unit cannot be turned, rotated or operated

Auxiliary function has not been released Release auxiliary function using switch S19

Lines are not connectedConnect lines

4.3Fuses and relays

Danger

Incorrect or bridged fuses do not provide the protection required for the protection of the machine operator and the electrical equipment. Only use original fuses (replacement fuses can be ordered from LIEBHERR). Never bridge electrical fuses. Before changing the fuses, switch off the electrical system.

4.3.1Fuse

4.3.2Control console C

4.3.3Control console

4.3.4Battery box

4.4Emergency operation

4.4.1Purpose

The emergency operation function is an auxiliary function that enables operators to restore machine functions that have failed. Depending on the situation, this auxiliary function might need to be activated, for example to remove a machine quickly from the construction site after a fault occurred.

When in emergency mode, various functions are directly controlled, so that the control and operating elements that are faulty are bypassed. The function is intended exclusively for temporary use in the event of an emergency and is not a substitute for proper repair.

The options available in emergency mode depend on the type and extent of the malfunction or fault. The following emergency mode functions are available:

ControlShort-term continuation of operation until repair can be performed (it is always recommended to carry out repairs without delay) Gear shifting

Hydraulic pumpMoving the machine away from the construction site or a dangerous position (immediate repair is required) Shut-down systems, restrictions (functions that limit the range of movement of the machine)

Disengaging transmissionTowing the machine to the workshop

For instructions on how to operate the machine in emergency mode, see next chapter.

Danger!

In emergency mode, certain safety functions of the control system are disabled. This can lead to accidents or damage to the machine. Use emergency mode only for the intended purpose. Inform all persons involved in the operation and maintenance of the machine that it is in emergency mode.

Immediately switch off the emergency mode when it is no longer required. Have the machine repaired as quickly as possible.

4.4.2Emergency gear shifting

If the parking brake cannot be released, this could be due to a failure of the solenoid valve of the gear shifting system. In this case, turn in the valve manually (emergency operation).

The valve block is located at the uppercarriage below the basic boom. Turn in the T-handle at the solenoid valve Y6. The machine is now in second gear and the parking brake is released. The machine can now be moved.

4.4.3Towing the machine

Towing the machine is a dangerous manoeuvre, and the responsibility for any damage in connection with towing rests with the operator.

The machine may only be towed in exceptional circumstances, e.g. if it must be moved for safety reasons or if it must be repaired at the workshop.

Injuries to persons or damage to equipment caused by towing of the machine are not covered by the manufacturer's warranty.

Note!

The travel drive can be damaged, if the machine is towed over a certain distance without disengaging the transmission.

If possible, disengage the transmission before towing the machine (see 4.4.4). Adhere to the maximum distance and speed for towing.

Danger!

Risk of injury! Risk of damage to property!

To tow the machine, use a suitably dimensioned rod. Never use a cable or rope.

Secure the towing rod to the towing hitch at the undercarriage. When towing the machine, adhere to the following limits:

–Towing speed: maximum 5km/h

–Towing distance - at released parking brake: few metres (to remove the machine from a dangerous position).

–Towing distance – with disengaged transmission: maximum 5km

4.4.4Disengaging transmission (emergency release)

Danger!

When the transmission is disengaged, the parking brake is disabled. The machine might roll away, if another brake (working brake) is disabled. When the diesel engine is off and the transmission is disengaged, all brakes (working brake, parking brake) are disabled. The machine might roll away, and the steering is stiff so that its operation requires some force.

Before disengaging the transmission, secure the machine against rolling off (with towing rod or chocks).

The transmission can be disengaged by pressing in grease. The respective adapter for connection to the transmission is found in the tool box.

Emergency release:

Attach the adapter B to the grease gun A Engage the adapter at the connection 1 Press in grease until it escapes at the pressure-relief valve 3 The transmission is disengaged. The machine can now be towed.

When the diesel engine is on and no other malfunctions are apparent, the machine can be stopped with the working brake (foot pedal) and steered with the servo steering.

If the diesel engine is not running: all brakes of the machine are disabled!

Caution!

The transmission might be damaged, if it is disengaged for a prolonged period of time while the machine is in motion.

Do not put the machine into gear and do not press the accelerator while the transmission is disengaged.

Deactivating emergency release:

Loosen the bleeder 2 using a wrench and open it until grease escapes.

Start the diesel engine.

Release the parking brake S16 while the working brake (pedal) remains applied.

Repeatedly shift gear S42

Leave the bleeder open until no grease escapes. Switch off the diesel engine.

Close and tighten the bleeder 2 The transmission is re-engaged.