4.2-2 Load moment limit systems
OSK floor control / raised seat control (overload protection hydraulically with hinged arm locked on
both sides):
If you should enter the overload range with your crane, the hand levers for all functions which increase
the load moment will be pushed into neutral position by blocking cylinders.
The following movements are no longer possible:
- boom:..........................................................lowering
- hinged arm : ...............................................lowering/raising
- extendable arm:...........................................extending
If fitted:
- rope winch: .................................................raising
- 2nd hinged system: ....................................lowering/raising
- 2nd hinged system: ....................................extending extendable arm
If possible you should reduce the load moment by retracting the
extendable arms. After this all crane functions are possible again.
If owing to the crane position (boom extended to stop and all extendable arms retracted) no further
load moment-reducing crane movements are possible proceed as follows to unblock the crane
functions.
OSK-overload safety device without push-botton
valve
• Activate the function “retract extendable arm”, this
releases the function “lower boom”.
• While you are activating the function “retract
extendable arms“, lower the boom.
Note that when lowering the hinged arm above horizontal the load
moment is increased (see page 4.2-3).
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