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4. HANDLING OF WIRE ROPE
4.1 CRITERIA FOR WIRE ROPE REPLACEMENT
CAUTION
• The criteria for replacing wire ropes is common to all the wire ropes for winching,
telescoping the boom, and slinging.
• The diameter of the wire rope is measured at points where the wire repeatedly runs
through the sheave. A mean value needs to be determined through 3 way measurement.
• Do not use old wire rope regardless of the frequency of use.
• See “MAINTENANCE 10.3 [1] REPLACEMENT OF WINCH WIRE ROPES" for details.
• Contact us or our sales service agency for replacing/repairing the wire ropes.
[1] WIRE ROPE NOMINAL DIMENSION
･
Wire rope for winch: IWRC 6 x Fi (29) 0/0 φ10 x 115m
・
No.5 rope for pulling out boom: IWRC 6 x Fi (29) 0/0 φ10
・
No.5 rope for pulling in boom: IWRC 6 x Fi (29) 0/0 φ8
[2] CRITERIA FOR WIRE ROPE REPLACEMENT
A wire rope undergoes wear and tear over time.
Prompt replacement is required if any of the following appears
in the wire rope.
1. With respect to the total number of elemental wires in the
outermost strand (excluding filler wires), when the number
of broken wires is equal to or greater than the following ratio.
(1) 10% or more of a single twist of rope. Nevertheless,
when breakage occurs in a single strand only, the
ratio should be 5% or more.
(2) 20% or more of 5 twists of rope.
2. A rope of which reduction in diameter due to abrasion
exceeds 7% of nominal diameter of the nominal diameter.
NOTES
Replace the 10mm diameter wire rope when it is reduced to
9.4 mm.
3. When either of the following is observed due to corrosion:
(1) Pitching occurred on the wire surface, that has
turned pockmarked.
(2) Wires that have lost tension due to internal
corrosion.