21.3
USE OF IMPLEMENTS
GRU FASSI
21.3 Generality
(version with load limiting device)
The winch is made of a drum that can rotate by means of a hydraulic motor, on a
structure fixed on the crane. The rotation of the drum on which the cable winds is
achieved by a hydraulic motor controlled by a safety check valve connected to the
crane circuit. A parking brake integrated to the motoreducer group hold the load
in position when the winch control lever is in neutral position.
Nomenclature of winch unit (fig. 23)
Pos. Description
1.
Winch
2.
Cable
3.
Fixed pulley
4.
Balance weight
5.
Hook
6.
Transmission pulley
7.
Block (double-triple.... line)
(!) ATTENTION (!)
Check the condition of wire rope.
(!)
On winches not equipped with cable layer, check the rewinding of the
cable on winch drum proceeds regularly and without overlapping: it is
suggested to rewind the cable only if it is sufficiently taut.
Do not rotate the crane before the load is lifted. Lift the load vertically using the
cable and not the boom in order to avoid swinging the load. With the suspen-
ded load rotate slowly and with care checking the stability of the vehicle.
21.4 Winch for crane
The identification data and the essential characteristics are marked on a plate
fixed by the manufacturer.
Manufacturer mark ...
Winch type ...
Serial number ...
Maximum line in N at the 4th layer...
Maximum speed in m/min ... or Maximum capacity pump l/min
(!) See operator winch manual supplied by the winches’ manufacturer.
The winch has a maximum capacity (which cannot be exceeded), indicated
by a plate, not related to the crane capacities which can also be lower.
Consequently avoid to lift, with the winch, heavier loads than those allowed
by the capacity plate of the crane with the winch.
Note: We do not recommend using the winch with load moving (winch in or out)
at the same time as the extension booms or the crane and hydraulic jib
(if fitted), since it accelerates the wear of the extension guide pads reducing
their life to one third compared to a standard application.
The cranes with winch feature a sensor that deactivates the exit of the extension
boom sections when the load on the winch exceeds the nominal load by 20%. There
is no other control on the maximum load lifting which is therefore limited only by the
lifting limit of the winch itself. In order not to overload the winch, it is therefore forbid-
den to lift a load attached to the winch cable using the crane rams when the load
exceeds the values indicated on the capacity plate of the crane with winch.
fig. 23
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