Malfunctions during crane operation
14.5 Emergency operations and programs
14 - 28 3 302 690 en Operating manual
GMK4100L-1
23.11.2017
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 activation.
In this case, you need one or two auxiliary cranes.
In the worst case, emergency operation must be performed by properly
qualified personnel, because incorrect operation poses the risk of injury
and damage to the main boom.
• Always check the following option first.
Prior to the emer-
gency operation,
check
First check whether it is permitted to lower the main boom to a horizontal
position with the current telescope status. Proceed as follows:
Enter and confirm the current rigging mode of the truck crane. The current
rigging mode must be shown on the
RCL display.
• 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 the main boom but there is not sufficient space, you
can check whether it is permissible to drive the truck crane in the current
rigging mode;
à p. 13 - 1.
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.
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