Driving
5.3 Driving and parking off the truck crane
5 - 42 3 302 633 en Operating Instructions GMK5250L
27.09.2017
Checks when
driving downhill
While driving, the engine speed may not exceed 2,300 rpm. The engine
speed is not limited automatically.
• Check the current engine speed on the tachometer while driving.
• Brake the truck crane before the speed exceeds 2,300 rpm.
When driving downhill, you can also slow down the truck crane as follows,
in addition to using the service brake:
– by shifting down;
à p. 5 - 42,
– with the engine retarder;
à p. 5 - 43,
– with the transmission retarder;
à p. 5 - 43.
Downshifting To increase the braking force of the engine, you can select a lower gear.
• Press the gearshift lever downwards once.
Manual operating mode is switched on, and if possible, one gear is shifted
down.
If you initiate a gear change which would cause the maximum permitted
engine speed to be exceeded, the transmission does not shift.
In that case, slow the truck crane down until a permissible engine speed is
reached, and downshift again.
S
Risk of damage due to excessive engine speed!
If the maximum permissible engine speed is reached, shift up to a higher
gear or slow the truck crane down.
This prevents damage to the engine or transmission.
S
Risk of damage from resonance vibrations!
Always maintain a speed below 85 km/h (53 mph). Stop the truck crane
promptly.
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