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C 4.74
Operating instructions
138 149 443
Troubleshooting guide
Problem Cause Remedy
Low tractive force Fault in boost or high-pressure system Check suction filter in return line
Check boost pressure in hydraulic system
Check high-pressure hydraulic system
Check for leaks on variable-
displacement pumps and wheel motors
Check control units and proportional
solenoids of variable-displacement
pumps
Check maximum current at
proportional solenoids
Eliminate detected faults
No forward and reverse travel Drive of variable-displacement pumps
defective
Forward/reverse selector switch in
neutral
Machine started with preselected
direction of travel
No power supplied to the electronics
Electrical connection to the variable
pump interrupted
Repair
Put forward/reverse selector switch
in desired direction of travel
Put forward/reverse selector switch
in neutral and preselect desired
direction of travel
Check fuses
Check electric connection
Make connection