6 minute read
Troubleshooting
Faults and remedies
Fault
Modes E and P showing lack of power No power adjustment via proportional solenoid valve Y50
Operating manual
Unplug cable of Y50 connection, remove safety cotter pin, move lever to emergency setting
Hydraulic oil temperature too highRadiator cores dirtyClean radiator cores
Fan or fan control defectiveRectify error / consult customer service
Hydraulic oil level too lowOil lossRepair leaks, exchange hoses, refill oil via return-line filter
Cannot drivePush the safety lever upPush the safety lever down No direction of travel preselectedUse drive selection switch in right joystick to determine direction of travel
Parking brake pressure switch defective Consult customer service
Parking brake not releasedRelease parking brake using switch
Parking brake will not release despite switch being operated
Servo pressure present: Operate emergency function Y6
Servo pressure not present: Consult customer service
Service brake engagedRelease service brake
Slewing gear not functioningNo servo controlPush the safety lever down Switch on servo control
4.2.3Transmission
Fault / errorCauseSolution
Oil flowing out on track rollers, support rollers or leading wheel
Insufficient crawler tracking on leading wheel
Seal defectiveReplace seal
Leading wheel tracking on track roller mounting has too much play
Crawler jumps off or overCrawler tension too low / crawler wheel worn
Correctly tensioned crawler losing tension quickly during use
Crawler tensioning cylinder defective
Adjust the leading wheel tracking play
Adjust crawler tension
Check crawler tensioning cylinder, change if required or seal (only authorized specialist personnel)
Track roller or support roller stickingRunning gear extremely dirtyClean running gear by
4.2.4Electrical system
Fault / errorCauseSolution
Battery charge telltale light does not goes out
Drive belt for alternator loose or tornTension or replace drive belt Alternator defectiveReplace alternator
Batteries do not charge or charge poorly Batteries defectiveReplace batteries
Battery connections dirty / oxidisedClean battery connections
Cable loose or damagedConnect or replace cable
Telltale light or display instrument not functioning or functioning incorrectly
Some or all functions on instrument panel drop out
Diesel speed adjustment via operating keypad (mode and arrow keys) not functioning
Bulb burnt out, display instrument defective Replace defective part
Plug connector separated or damaged, earth lead interrupted, short circuit fuse defective
Mount plug connector correctly or change, rectify short circuit, replace fuse or activate overload cut-outs
Automatic idling switch S20 is activated Touch the joystick or deactivate automatic idling switch S20.
Automatic idling not functioning, speed does not reduce
Servo control cannot be activated using switch
Parking brake cannot be released using switch
Slewing gear brake cannot be released using switch
No signal emits from speed sensor B12
Excavator speed adjustment electronics do not function Switch the emergency function over from “AUTO” to “MANU” using switch S71 in the right control panel. Set speed using switch S72. Emergency function display appears on monitoring screen. Consult customer service.
Permanent sensor signalConsult customer service
Switch S20 is deactivatedActivate switch S20
Excavator electrics faultySwitch on emergency function using switch S73 in the right control panel Caution: Servo circuit and brake circuit can only be switched off using the safety lever. Keypad not functioning. Consult customer service.
4.2.5Work equipment
Fault / errorCauseSolution
Cylinder stretches when loadedPiston seal in cylinder defectiveOverhaul cylinder
Bearing clearance too high on equipment
Bearing points worn outReplace bearing parts
Grab / bucket does not moveValve block on tilting cylinder incorrectly switched
Add-on unit cannot be turned / rotated / operated
Auxiliary function has not been released
Switch over valve block
Release auxiliary function using switch S19
Lines are not connectedConnect lines
4.2.6Heating/air-conditioning system
Fault / errorCauseSolution
Heating not giving out warm airShutoff valves for coolant line on diesel engine closed Open shutoff valve
Engine not at operating temperatureBring engine to operating temperature
Heating fan does not operateNo 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
In addition, the troubleshooting in the heater and airconditioning circuit is facilitated by the upcoming of error codes in the display area of the heater/airco operation unit. These error codes inform upon the possible troubles on given components in the operation and control circuits of the heater airco/plant. They are listed below:
Error code “F0“ faulty room temperature gauge:
The control unit has recognised a faulty room temperature gauge, the regulation is no longer ready for operation.
Cause of gauge error: short-circuit or interruption of gauge power supply line, defecive plug connection on gauge or on control unit, or temperature gauge faulty.
The heater / airco regulator is then only ready for operation again when the fault of the gauge has been remedied, the gauge error will then no longer be displayed! Should a gauge error occur, the regulator continues to operate to the setting which was valid before the fault was recognised.
Error code “F1“ faulty blow-out temperature gauge:
The control unit has recognised a faulty blow-out temperature gauge, the regulation is no longer ready for operation.
Cause of gauge error: short-circuit or interruption of gauge power supply line, defective plug connection on gauge or on control unit, or temperature gauge faulty.
The heater / airco regulator is then only ready for operation again when the fault of the gauge has been remedied, the gauge error will then no longer be displayed! Should a gauge error occur, the regulator continues to operate to the setting which was valid before the fault was recognised.
Error code “F2“ faulty reserve temperature gauge:
The control unit has recognised a faulty reserve temperature gauge, the regulation is no longer ready for operation.
Cause of gauge error: short-circuit or interruption of gauge power supply line, defective plug connection on gauge or on control unit, or temperature gauge faulty.
The heater / airco regulator is then only ready for operation again when the fault of the gauge has been remedied, the gauge error will then no longer be displayed! Should a gauge error occur, the regulator continues to operate to the setting which was valid before the fault was recognised.
Error code “F3“ faulty vent flap foot room area and front window:
The control unit has recognised a faulty vent flap in the air duct to the front window and foot area, the regulation is once again ready for operation.
Cause of flap fault: short-circuit or interruption of the power supply line, defective plug connection on flap motor or on control unit, or flap motor faulty.
After remedying of the fault, the fault is no longer displayed. Should a flap error occur, the regulator carries on working as usual, only the middle position of the vent flap can no longer be started.
Error code “F4“ pressure fault and faulty magnetic coupling: The control unit has recognised a faulty vent flap room area and front window, the regulation is once again ready for operation.
Cause of flap fault: short-circuit or interruption of the power supply line, plug connection on fan flap motor or control unit, flap motor faulty.
After remedying of the fault, the fault is no longer displayed! Should a pressure fault or faulty magnetic coupling occur, the regulator carries on working as usual, only the magnetic coupling output is interrupted.
Error code “F5“ faulty data transmission operating feature / control unit:
Data transmission from the operating feature to the control unit is faulty.
Cause of the fault: short-circuit or interruption of the data line to control unit, plug connection on operating feature or control unit.
The operating feature continues to try to establish data connection to the control unit, if the connection is once again OK, “F5“ – fault will no longer be displayed. If the data transmission from the operating feature can not be established again, the ignition must be switched off, and RESET will be carried out following the restart.
4.2.7LIEBHERR particles filter system
Chart of errors on particle filter control unit A175.
LCD display messageLEDCauseRemedy
"Themo element 1 (or 2) is defective"
(or "Thermoelement 1 (oder 2) defekt")
Buzzer (H) is activated.
"ERROR idling / Temp. ignition block active"
(or "Fehler Leerlauf / Temp. Zündungssperre aktiv")
Buzzer (H) is activated.
"Error interrupt. Terminal W"
(or "Fehler Unterbr. Klemme W") orange + green orange + green orange + green
Buzzer (H) is activated.
Defektive or interruption ot a temperature sensor
Press key E: Deactivation of the acoustic alarm (buzzer).
Check temperature sensor, connect or, if necessary, replace.
Too long operation with low exhaust gas temperature (low engine load)
Press key E: Deactivation of the acoustic alarm (buzzer). Increase engine load (full load operation)
Idling operation too longOperate machine with higher speed.
Interruption of the of the speed logging.
Press key E: Deactivation of the acoustic alarm (buzzer).
Check the circuit for speed logging and, if necessary, replace.
"Pre-loading pressure achieved" (or "Vorbeladedruck erreicht")
Buzzer (H) is activated at interval
"Main load pressure achieved." (or Hauptbeladedruck erreicht")
Buzzer (H) is activated at interval
"Filter breakage or pressure line clogged" (or "Filterbruch oder Druckleitung zu")
Buzzer (H) is activated at interval
"Call service" (or "Service rufen") red (A) + green red (A) (blink) + green
All LEDblin k
Heavy loading of the particles filter through soot or ash particles.
Load on the particles filter is too high due to soot or ash particles collection.
Defective particle filter (By-Pass) or blocked pressure line or leak in the pressure line
Operate the excavator with full load until the back pressure decreases. If the back pressure doesn’t decrease, carry out a filter cleaning
Press key E: Deactivation of the acoustic alarm (buzzer). Clean the filter.
Press key E: Deactivation of the acoustic alarm (buzzer). Check particle filter module, if necessary, or replace filter module, if necessary or eliminate blockage in the pressure line or eliminate leak in the pressure line
The pre-set operating hours until the next service / cleaning of the filter module has expired
Press key E Set back the operating hours counter.
For Filter maintenance see the chapter 5 "Maintenance"
