Malfunctions during crane operation
14.5 Emergency operations and programs
Operating manual 3 302 690 en 14 - 29
GMK4100L-1
23.11.2017
Mechanical
emergency
activation
The following requirements must be met before unlocking manually:
– The main boom must be lowered to the horizontal position so that the
telescopic section cannot retract by itself.
or
– The telescopic section to be unlocked is secured against retracting by
itself by using an auxiliary crane. Telescoping is done with the auxiliary
crane.
H
If the telescoping cylinder is positioned at a locking point, the correspond-
ing telescopic section cannot be locked or unlocked manually.
There are two M8 bolts for every telescopic section:
You will need a suitable hexagon L-wrench (3),
at least 250 mm (9.8 in) long.
In order to unlock the telescopic section, screw
the bolts (4) into the bores (1) in the locking
pins.
Pins located further inside are reached
through the bores (2).
s
G
Risk of accidents due to sudden retraction of a telescopic section
Before unlocking the telescopic section, secure it against automatic retrac-
tion. This prevents the retracting telescopic section severing one of your
limbs or the truck crane being damaged or overturned by the telescopic
section suddenly retracting.
Telescopic
section:
I II III IV V VI
Length:
270 mm
(10.6 in)
230 mm
(9.1 in)
200 mm
(7.9 in)
170 mm
(6.7 in)
135 mm
(5.3 in)
120 mm
(4.7 in)
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