Maeda CC1485S-1, Инструкции по эксплуатации, Страница: 250 / 370

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10.3 IRREGULAR MAINTENANCE
[1] REPLACEMENT OF WINCH WIRE ROPE
Always put on thick leather work gloves when replacing the wire rope.
CAUTION
• 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. (A measurement should be performed not only at 1 point but also at
several points with a space between the points.)
• Do not use old wire rope regardless of the frequency of use.
[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 the nominal diameter.
NOTES
Replace the 10mm diameter wire rope when it is reduced
to 9.4mm.
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.
4. As a result of form collapsing, the following are observed:
(1) A strand that is kinked.
(2) When the width of an undulation exceeds 4/3
d
within a section that is 25 times of nominal
diameter
d .
(3) When a wire rope is flattened by local crushing
and the minimum diameter is 2/3 of the maximum
diameter or less
(4) A rope of which core wires or rope core is
exposed.
(5) A rope extremely bent
(6) A rope appearing like a cage
(7) A strand that has been intruded.
Undulation width