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6.3 SAFETY DEVICES
6.3.1Safety devices installed
All the safety devices,installed on MAXILIFT COBRA 5500 crane, are listed and described in the following
pages.
description of safety functions
The crane is fitted with 4 standard electrohydraulic safety limitations:
1) The load limiting device, which intervent each time the load mentioned on loading diagram is excee
ded and locks the crane, stopping all mouvements, except re-entry of boom extension and lowering
the load.
2) 0° working placing of the boom. The crane is fitted with a stop-end system allowing only boom lifting
manoeuvre when the position is lower than 0° (rest position)
3) Stop-end system for winch raising, which intervent in order to avoid the travelling block to hit against
the pulley. It stops the raising of the winch rope, boom lowering and boom extension.
4) Stop-end system for winch lowering, which intervent when in thr winch drum remaining only 3 wraps
of rope and locks the lowering of the winch rope.
ATTENTION
It is strictly forbidden to alter or manipulate the safety devices
Before operating the crane make sure that all the safety devices are in perfect working conditions
6.3.2Load limiting device
The load limiting device system locks crane functioning when pressure in the main cylinder reachs the
setting level, corresponding to the nominal crane moment.
The load limiting is used in order to avoid crane overload.
In lock position it is not possible to carry out any manoeuvre, except re-entry of boom extension and lowering
the load (only possible manoeuvres).
In order to unlock the crane, re-entry with the boom extension until crane moment becomes lower than that
marked on the loading diagramm, or intervent on winch lowering by putting the load on the ground.
DANGER
The load limiting device, even when in perfect working condition, cannot avoid accidents due to
operator’s maneuvering mistakes.
DANGER
It is strictly forbidden to operate the crane with its load limiting device switched off or put out of
service or faulty.
NOTE
The load limiting device can lock at the max. main boom angle even without load.
In such case, in orer to unlock the machine it is necessary to act simultaneosly both on the ex-
tension re-entry and boom lowering levers.
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