Chapter 5 Safety equipment
Hydraulic overload protection
When the crane reaches the overload range the locking cylinders push the hand levers that increase
the load moment back into neutral positions.
The following movements will then be blocked:
Lower main boom
Extend extension boom
The hand levers will only be released when the load moment has been reduced.
If possible, reduce the load moment by operating
the ‘Retract extension boom’ function. After this all
crane functions will be operable.
No movements possible:
If crane movements that reduce the load moment are not possible because of the crane position (all
extension booms retracted), take the following steps to unlock the crane functions:
If the main boom is locked in the upper stop,
actuate the touch valve and
lower the main boom until the hand levers
(operating levers) are released.
Warning! The load moment briefly increases while the main boom is
being lowered above the horizontal.
All crane functions are operable again.
Overload protection in radio remote control operation
When the crane reaches the overload range all functions that increase the load moment get blocked,
only those functions are still enabled that reduce the load moment.
Movements that increase the load moment will then be blocked:
• Raise / lower main boom.
• Extend the extension boom.
• Raise rope winch.
The crane functions will only be released when the load moment has been reduced. Example: Retract
extension boom.
If crane movements that increase the load moment are not possible because of the rope winch (cut-
off), actuate ‘Lower the rope winch’ and land the load.
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