Manitowoc Grove GMK6300L Operating Manual page 943

Mechanical
emergency
activation
G
H
Operating Manual GMK6300L
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.
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.
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,
– Length 300 mm (11.8 in) for telescopic sections I to III,
– 270 mm (10.6 in) length for telescopic section IV,
– 230 mm (9.1 in) length for telescopic section V,
– 200 mm (7.9 in) length for telescopic section VI.
14.5 Emergency operations and programs
Screw (4) into the locking pins (1) to unlock.
Pins located further inside are reached
through the bores (2).
You will need a suitable socket wrench (3),
with one shank being at least 200 mm long.
– To unlock, the screws are screwed in.
– To lock, the screws are screwed out.
3 112 xxx en
Malfunctions during crane operation
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