Maeda MC815C, Руководство по эксплуатации, Страница: 224 / 426

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5. HANDLING WIRE ROPE
5.1 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 “INSPECTION AND MAINTENANCE 9.2 [3] REPLACEMENT OF WINCH WIRE ROPE”
for details.
• Contact us or our sales service agency for replacing or repairing the wire ropes.
[1] WIRE ROPE NOMINAL DIMENSION
• Wire rope for winch: IWRC 6×Fi (29) 0/0 ø10 mm × 150 m
• Wire rope for extending boom No.5: IWRC 6×Fi (29) 0/0 ø12.5 mm × 8.96 m
• Wire rope for extending boom No.5: IWRC 6×Fi (29) 0/0 ø9 mm × 17.04 m
[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.
• 10 % or more of strands (except a filler wire) in 1 twist (6
crests) of a wire rope are broken.
NOTES
When 9 strands or more for the winch, or 13 strands or
more for the telescoping boom has been broken, replace
them with new ones.
• When the amount of decrease in diameter due to
abrasion damage reaches 7 % or more of the nominal
diameter of the wire rope.
NOTES
• For a wire rope of which the diameter is ø9 mm, replace
when its diameter becomes 8.4 mm.
• For a wire rope of which the diameter is ø10 mm, replace
when its diameter becomes 9.3 mm.
• For a wire rope of which the diameter is ø12.5 mm,
replace when its diameter becomes 11.7 mm.
• A kink is formed.
• Considerable deformation or corrosion is developed.
• A faulty end socket is used.