Holder C-Trac 4.74 - Manual (Page 142)

Operating instructions
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C 4.74
Troubleshooting guide
Problem Cause Remedy
Differential lock does not operate Fuse blown or bad contact
Switch defective
Hydraulic valve for differential lock
defective or no pressure exists
No power
Differential lock on wheel motor too
hard to operate
Check fuse,
remake contact
Check / renew the switch
Check hydraulic system and
hydraulic valve
Check and repair electrical
connections, cables
Repair
Parking brake can not be released Switch defective
Too little pressure in accumulator
Check / replace switch
Start engine to build up pressure