21.2.1 Winches equipped with a mechanical stroke end
device
(!) ATTENTION (!)
The end stroke condition takes place when the block takes contact with the pulley structu-
re. The operator must stop the manoeuvre before the block rotates the pulley completely
with consequent activation of the load cell on the winch. Such end stroke device shall be
used only under emergency conditions and not as a simple end stroke interrupter.
The mechanical stroke end device combined with the winch limiter prevents the hook
bracket (or pulley/snatch block) from hitting the fixed pulley when lifting or when extending
the extension booms, and thus from damaging the cable.
When the winch limiter is activated, all the crane functions are disabled.
Manoeuvres allowed:
- Rotation in both directions
- Re-entry of the crane extension boom sections
- Re-entry of the extension booms sections of the jib
- Winch rope descent
Manoeuvres not allowed:
- all other movements
When unwinding, an electric device maintains at least three (3) turns of the lifting cable
wound around the winch drum on activation the following controls are desactivated.
Manoeuvres not allowed:
- Winch rope descent
Manoeuvres allowed:
- all other movements
(!) ATTENTION (!)
Limit the exit speed of the extension rams when, during the lifting, the hook bracket (or pul-
ley/snatch block) is next to the fixed pulley, in order to avoid unnecessary stress to the cable.
(!) ATTENTION (!)
When the hook bracket (or pulley/snatch block, in case of double or triple line) and the fixed
pulley are very close, and the operator needs to manoeuvre in their proximity (i.e. operations
like load hook-up, arms folding, etc), we recommend to always stand side on with respect to
the pulley plan (never in front or at the back) and to operate the crane at a low speed, since
the contact (especially without load) can result in rapid and violent rotations of the hook
group (from the fig. 26 to the fig. 27).
(!) ATTENTION (!)
The end stroke condition takes place when the block takes contact with the pulley structu-
re. The operator must stop the manoeuvre before the block rotates the pulley completely
with consequent activation of the load cell on the winch. Such end stroke device shall be
used only under emergency conditions and not as a simple end stroke interrupter.
21.2.1
USE OF IMPLEMENTS
GRU FASSI
CORRECT POSITION
FOR THE PULLEY AND
THE PULLEY BLOCK
*
fig. 27
fig. 26
SINGLE LINE
DOUBLE LINE
*
*
TRIPLE LINE
*
QUADRUPLE LINE
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