Driving
5.4 Off-road driving
5 - 56 3 302 633 en Operating Instructions GMK5250L
27.09.2017
5.4.3 Freeing an immobilized truck crane
Rocking the truck
crane free
If the truck crane is stuck in terrain, you can try to free it by driving back and
forth (rocking it free):
If you are trying to rock the crane free, you should switch on the transverse
differential locks and the longitudinal differential lock.
• Switch to transmission mode D or R.
• Select a smaller starting gear with the gearshift lever.
• Start driving as far as you can as high as possible.
• Release the accelerator. The transmission declutches disengage.
• Let the truck crane roll in the opposite direction as far as it will go.
• Start driving, again to the highest point.
• Repeat driving and letting the truck crane roll back until it has rocked itself
free.
H
It is not helpful to switch between transmission mode D and R, as switching
to Ris only performed when the truck crane is stationary – and takes a few
seconds. You would not be able to take advantage of the momentum
generated by the change of direction.
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