Crane operation
11.5 Crane operation with main boom
Operating manual 3 302 819 en 11 - 79
GMK3060
13.12.2018
Deformation of the
main boom due to
direct sunlight
One-sided direct sunshine can lead to a temperature difference between the left
and the right main boom side. This results in a different length extension. A lateral
deformation of the main boom is the result. The degree of deformation depends
on the actual temperature difference and the current main boom length.
Assuming a temperature difference of 30° (86 °F) and a system length of 60 m
(196.85 ft), a deformation without load of up to 1 m can occur. This would be a
deformation of 1.7%.
Preventive measures
• If possible, turn the superstructure to a (park) position where both main boom
sides are heated evenly to prevent deformation.
Before any lift with deformed main boom
The main boom must be telescoped out to the length required for the lift. The
maximum permissible lateral deformation of the unloaded main boom (with
reeved hook block) is 1% of the main boom length.
• Check the deformation before the lift.
• Only lift the load if the current deformation is permissible.
For any lift with deformed main boom
The maximum permissible lateral deformation of the loaded main boom is 3%
of the current boom length.
• Check the deformation during the lift.
• Put the load down before the maximum permissible deformation is
exceeded.
• Reduce additional, dynamic influences by wind.
• Carry out crane movements with minimal speed.
G
Risk of accidents due to overloading the truck crane!
An excessively deformed main boom can be overloaded or suffer from invisible
damage which can lead to overloading of the main boom on subsequent lifts with
permissible deformation or reduce the life span of the main boom.
Make sure that the maximum permissible values for lateral deformation are not
exceeded.
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