Furukawa Unic URW370C4U Series, Руководство по эксплуатации и техническому обслуживанию

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14-7
4-rope hooking
Wire socket
Direction that rope
is untwisted
Direction that
rope is twisted
(Note) Rotate wire socket to the direc-
tion opposite to wire ropes have
been twisted.
8.
Attach the wire socket and repeat winding
up and down the rope 2 or 3 times between
both extremes.
Then, check if twist of the wire ropes is cor-
rected.
If they remain twisted, repeat the procedures
shown above.
7.
Remove the wire socket and turn the sock-
et in the untwisting direction by as many
turns as the wire ropes have been twisted
multiplied by the number of wire ropes being
hooked.
However, remember that the wire socket may
be turned up to 4 turns at a time.
6.
Wind up the hook and retract the boom to
be on a stored condition.
5.
Check how many turns the wire rope has
been twisted.
4.
Unwind the hook until it comes close to
the ground.
3.
Raise the boom to an angle of approxi-
mately 65°.
2.
Extend the boom fully.
1.
Unload the hook.
Wire ropes tend to turn in untwisting direc-
tion when they are under tension.
If two or more wire ropes are hooked togeth-
er, they tend to be twisted particularly while
they are new.
The twist will decreases as the ropes are get-
ting fit to the crane.
If wire ropes are twisted, correct them as fol-
lows:
3.
◆
How to correct twisted wire
ropes
MAINTENANCE AND INSPECTION OF CRANE