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Operating instructions
149 443 139
C 4.74
Troubleshooting guide
Problem Cause Remedy
No forward and reverse travel Forward/reverse selector switch
defective or bad contact
Drive program switch at 0
Replace forward/reverse selector
switch, make contact
Select desired driving program
No forward and reverse travel or only
one direction
Fault in boost or high pressure system Check boost pressure in hydraulic
system
Check high-pressure hydraulic
system
Check control units and proportional
solenoids of variable-displacement
pumps
Eliminate detected faults
No fast-slow available Driving program switch defective
Hydraulic valve for slow/fast defective
or no pressure available
Electric connection to hydraulic valve
for slow/fast interrupted or bad contact
Renew driving program switch
Check hydraulic valve
Make connection
Vehicle drives in one direction only Forward/reverse selector switch
defective
Electrical connection to the variable-
displacement pump interrupted
Replace forward/reverse selector
switch
Make connection