21.4.1 Winches equipped with a mechanical stroke end
device
(!) ATTENTION (!)
The end stroke condition makes place when the block takes contact with the
pulley structure. The operator must stop the manoeuvre before the block
rotates the pulley completely. Such end stroke device shall be used only
under emergency conditions and not as a simple end stroke interrupter.
When the load exceeds the winch nominal load by 20% the exit of the exten-
sion boom sections is deactivated.
When unwinding, an electric device maintains at least three (3) turns of the lif-
ting 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 pulley/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 recom-
mend 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 (espe-
cially 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 makes place when the block takes contact with the
pulley structure. The operator must stop the manoeuvre before the block
rotates the pulley completely. Such end stroke device shall be used only
under emergency conditions and not as a simple end stroke interrupter.
21.4.1
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
View thousands of Crane Specifications on FreeCraneSpecs.com
View thousands of Crane Specifications on FreeCraneSpecs.com