Manitowoc GROVE GMK 6400, Operating Manual

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Malfunctions during crane operation
14.5 Emergency operations and programmes
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14.5.1 Mechanical emergency activation for retracting
If you can no longer lock and unlock the telescopic sections from within the
crane cab because of a malfunction, you can do so manually by performing
mechanical emergency operations.
In this case, you need one or two auxiliary cranes.
In the worst case, emergency operation has to be performed by properly
trained personnel, because incorrect operation poses the risk of injury and
damage to the main boom.
•
Always check the following option first.
Checks before
emergency
operation First check whether it is permitted to lower the main boom to a horizontal
position with the current telescope status. Proceed as follows:
Enter the current rigging mode on the RCL. The corresponding RCL code
according to the
Lifting capacity table must be displayed.
•
Lower the main boom.
– If the RCL allows the boom to be lowered into a horizontal position
You can reach the locking points with a ladder and need only one auxiliary
crane to telescope the unlocked telescopic sections
– If the RCL is deactivated prior to reaching the horizontal position
In order to reach the locking points, you need an auxiliary crane with
licensed passenger transportation and a second auxiliary crane to secure
and telescope the unlocked telescopic sections
H
If it is possible to lower but there is not sufficient space, you can check
whether the truck crane can be driven in the current rigging mode;
à
p. 13 - 1.
Operation with the lattice extension;
à
Lattice extension operating instruc-
tions
.
Procedure The best suitable retracting procedures in your particular case depend on
the conditions on site and on the crane functions that are still available.
Select the procedure best suited to your particular case and consult
Manitowoc Crane Care .