Crane operation
10.5 Crane operation with main boom
Operating Instructions GMK5250L 3 302 633 en 10 - 85
27.09.2017
10.5.5 Derricking gear
You can raise and lower the main boom.
Depending on the size of the load and the rigging mode, the RCL will switch
off the lowering process of the boom as soon as leaving the working area
specified in the
Lifting capacity table.
H
Raising the boom is a movement that reduces the load moment and that is
not switched off by the RCL. However, raising the boom is the movement
which can cause the truck crane to overturn if the load lifted is too heavy.
You can display the operating hours of the derricking gear;
à p. 10 - 130.
Switching on the
derricking gear
After the ignition is switched on, all of the power units will be switched off
and the lamps in the corresponding buttons will light up only dimly.
• Press the button (1) once.
– The lamp in button (1) lights up brightly.
– Symbol (2) is green when the derricking gear is switched on.
If the control lever is assigned more than one function, all other power units
which are assigned the same control lever movement are switched off;
à Control lever configuration, p. 8 - 14.
Maximum permis-
sible derricking
speed
The maximum permissible derricking speed is limited automatically
depending on the system length. The scale of the limitation is specified in
the supplied lifting capacity table.
The current speed reduction is displayed in the start menu;
à RCL display,
p. 8 - 20.
s
G
Danger of overturning when lifting loads!
It is prohibited to lift loads by raising the boom, since the RCL does not
monitor this procedure!
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