Malfunctions
Operating manual
Problems and remedies
Problem / error
Cause
Remedy
Engine is stalling
No performance setting via proportional solenoid valve Y50
Unplug cable of Y50 connection, remove cotter pin, move lever to emergency setting
Hydraulic oil temperature too high
Radiator contaminated
Clean radiator
Fan or fan control defective
Remedy error / consult LIEBHERR Service
Hydraulic oil level too low
Oil loss
Repair leaks, replace hoses, add oil via return filter
No travel function
Raise safety lever
Lower safety lever
No travel direction preselected
Determine travel selection switch via travel selector switch in right joystick
Pressure switch - parking brake defective
Consult LIEBHERR Service
Parking brake not released
Release 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
Swing gear not functioning
Operating brake engaged
Release operating brake
No servo control
Lower safety lever Turn on servo control
Swing brake activated
Lower safety lever Release swing brake
No working movement
No servo control
Lower safety lever Turn on servo control
4.2.3
No servo pressure present
Consult LIEBHERR Service
No pump high pressure present
Consult LIEBHERR Service
Travel gear
Problem / error
Cause
Remedy
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
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.
Machine moves too slowly
Incorrect gear reduction via switch S42. Creeper gear activated via switch S21. Travel pedal cannot fully shift through.
Select a different reduction via switch S42. Deactivate creeper gear via switch S21. Clean cab floor. Consult LIEBHERR Service.
copyright by
4-8
MJFCIFSS
A 312 Litronic / 11140216
