Manitowoc GROVE GMK5150L, Operating Manual

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Malfunctions during crane operation
14.5 Emergency operations and programs
Operating manual 3 302 709 en 14 - 31
GMK5150L
1
2
.0
1.
201
8
Mechanical
emergency
activation The following requirements must be met before manually unlocking a lock:
– 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 x 110 bolts for every telescopic section.
These bolts are in the toolbox supplied with the crane.
You will need a suitable tool ( 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.