OSK-overload safety device with push-botton valve
• Press the push button valve
• While you press the push button valve, lower the
main boom.
Note that when lowering the hinged arm above horizontal the load
moment is increased (see page 4.2-3).
The hand levers are only released again after the load moment has been reduced. This is achieved by
retracting the extendable arms. If this is not possible with the extendable arms retracted, the boom can
be lowered at the same time as activating the pushbutton valve.
Before starting work a function check (without load) of the load moment limiting system must
be carried out:
• Extend the boom at maximum speed to the stop. The load moment limiting system must respond
when the stop is reached (Avoid this test position when working).
• The movements previously listed must be blocked.
If the overload protection does not respond crane operation is to be
discontinued IMMEDIATELY
and a service workshop visited.
After the function check of the load moment limiting system activate, with floor control as described
above, the function “retract extendable arms” and lower the boom.
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