Driving
5.2 Operating the transmission
5 - 30 3 112 993 en Operating manual GMK 6400
12.07.2013
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
operating 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,
– When you step on the accelerator to the full (kick down), the transmission
first shifts to a lower gear. After that, it will shift to a higher gear once a
higher engine speed has been reached in order to attain maximum accel-
eration.
If you execute a manual gear change using the transmission lever, you
simultaneously switch to
Manual operating mode.
The transmission will only perform an automatic shift after you have
switched to
Automatic operating mode (push the switch lever to the left
once).
G
Risk of accident when changing while driving
If you change over to a position while driving which deviates from the cur-
rent driving direction, the transmission shifts to 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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