Malfunctions during crane operation
14.5 Emergency operations and programs
14 - 30 3 302 819 en Operating manual
GMK3060
13.12.2018
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.
Checks before
emergency
activation
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 authorised to
lift persons 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.
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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