Furukawa Unic URW370C4U Series, Operation & Maintenance Manual

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14-4
Be sure to replace a wire rope when it
comes under the criteria, item 1 through 4,
illustrated above.
1.
A rope in which amount of broken strand
wires (except filler wires) comes to more than
10% within a pitch of twist.
Replace the wire ropes intended for use with
this crane if 13 pieces of strand wire have
been broken within a pitch of twist.
2.
A rope being kinked.
4.
A rope which has been deformed and/or
corroded excessively.
3.
A rope from which its diameter has
decreased by more than 7% of the nominal
diameter.
For example, if wire rope with a nominal
diameter of 5/16in.(8mm) is used, replace it
when the diameter becomes 0.29in.(7.5mm).
Refer to the section 17. MAJOR SPECIFI-
CATIONS, for length and construction of the
wire rope for winding-up.
1.
◆
Replacement criteria
Wire rope is an expendable article and it will
be damaged and its strand wires are broken to
allow it to be thinner through a long period of
operation.
Replace the rope according to following cri-
teria.
Replacement of wire
rope (for winding-up)
CAUTION
Wear leather gloves when replac-
ing wire ropes.
1
2
Wire rope
diameter
3
4
MAINTENANCE AND INSPECTION OF CRANE