Driving
5.2 Operating the transmission
Operating manual 3 302 736 en 5 - 31
GMK4090
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5.2.6 Driving and changing gears
•
When driving, always leave the switch in the position for the current driv-
ing direction, e.g. in position D for forward travel.
In automatic oper-
ating mode
In this operating mode, the transmission changes to the gear suitable for the
current load, engine speed and position of the accelerator.
Automatic upshifting
You can influence upshifting by using the accelerator.
Automatic downshifting
– When you slow down the truck crane by braking, the transmission shifts
down when the appropriate engine speed is reached.
– If you fully depress the accelerator full (kick down), the transmission first
shifts to a lower gear. After that, it will shift to a higher gear only once a
higher engine speed has been reached, so as to achieve maximum accel-
eration.
If you execute a manual gear change using the gearshift lever, you simulta-
neously switch to
Manual operating mode.
The transmission will only perform an automatic shift after you have
switched to
Automatic operating mode (push in the gearshift lever once).
s
G
Risk of accidents due to changing transmission direction whilst driving
If whilst driving in one direction you select a gear for the opposite direction,
the transmission shifts into the neutral position. In this position, you cannot
accelerate the truck crane, even in an emergency, and the engine retarder
does not work.
– Pressing the accelerator
slightly:
Upshifting at low engine speed
– Pressing the accelerator
harder:
Upshifting at high engine speed
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