Malfunctions during crane operation
14.5 Emergency operations and programmes
Operating manual GMK 6400 3 112 993 en 14 - 41
12.07.2013
Mechanical emer-
gency operation
The following requirements must be met before unlocking manually:
– The main boom must be lowered to the horizontal position so that the tel-
escopic 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 screws for every telescopic section:
– 200 mm length for telescopic section
I
– 150 mm length for telescopic section II
– 110 mm length for telescopic sections III and IV
Screw (3) into the locking pins (1) to unlock.
Pins located further inside are reached
through the holes (4).
You will need a suitable socket wrench (2),
with one shank being at least 200 mm long.
– To unlock, the set screws are screwed in
– To lock, the set screws are screwed out
s
G
Risk of accident 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 from severing one of
your limbs or the truck crane from being damaged or overturned by the
telescopic section suddenly retracting.
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