6.18 IRREGULAR MAINTENANCE M A E D A Crawler Crane
6-76 5/2020 CC1908S-1
• 20 % or more over 5 twists of rope.
2. Rope for which the reduction in diameter due
to wear exceeds 7 % of the nominal diameter
Example: Replace a 10 mm diameter wire
rope once it has thinned to 9.4 mm.
3. When either of the following is observed due
to corrosion:
• Pitching has occurred on the wire surface,
and it has become pockmarked
• Wires have lost tension due to internal
corrosion
4. As a result of the form collapsing, the
following is observed:
• Strands that are kinked
• When the width of an undulation exceeds
4/3d within a section that is 25 times the
nominal diameter d
• When a wire rope is flattened by local
crushing and the minimum diameter does
not exceed 2/3 of the maximum diameter
• A rope in which core wires or the rope
core is exposed
• A rope that is extremely bent
• A rope appearing like a cage
• A rope in which a strand has intruded
• A rope in which one or more strands are
loose
• A rope with wires that are noticeably
sticking out
5. A rope with a faulty end socket
Undulation width
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