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4. HANDLING WIRE ROPES
4.1 BENCHMARK FOR REPLACING WIRE ROPES
CAUTION
• The benchmark for replacing wire ropes is common to all the wire ropes for winching,
telescoping the boom, and slinging.
• Measure the wire rope diameter at the section where the rope repeatedly passes through the
sieve. Measure from three directions and average the value.
• Do not use the old wire ropes even if they had not been used.
• See “Maintenance 8.5 [2] Replacement Winch Wire Ropes” for how to replace the wire rope.
• Contact us or our sales service agency for replacing/repairing the wire ropes.
[1] WIRE ROPE NOMINAL DIMENSION
• Wire rope for winching : IWRC 6 x Ws (26) 0/0 φ8 x 73 m
• No. 5 wire rope for extending boom: IWRC 6 x Fi (29) 0/0 φ8 x 5.825 m
• No. 5 wire rope for retracting boom: IWRC 6 x Fi (29) 0/0 φ6 x 10.885 m
[2] BENCHMARK FOR REPLACING WIRE ROPES
The wire rope fatigues as time goes by.
Change the wire ropes when they show the following signs.
• In one twist (6 crests), 10 % or more of the wires (excluding the
filler wires) are broken.
NOTES
Change winching/boom telescoping wire rope when 13 or more
wires are broken.
• The diameter of the wire rope is worn for 7 % or more of the
nominal diameter.
NOTES
• Change the 8-mm diameter wire rope when it is reduced to 7.5
mm.
• Change the 6-mm diameter wire rope when it is reduced to 5.6
mm.
• The rope is twisted and has some kinks.
• The rope shows remarkable deformation or corrosion.
• The rope shows some abnormality at the terminals.
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