Maeda CC423S-1, Руководство по эксплуатации

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4. HANDLING 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.
• For details about methods for replacing wire ropes, refer to “Inspection and Maintenance 10.3
Irregular Maintenance [8] Wire Rope Replacement”.
• Contact us or our sales service agency for replacing or repairing the wire ropes.
WIRE ROPE NOMINAL DIMENSION
• Wire rope for winch: IWRC 6

Ws (26) 0/0 ϕ 8

73 m
• No. 4 Wire rope for pulling out boom: IWRC 6  Fi (29) 0/0 ϕ 9
• No. 4 Wire rope for pulling in boom: IWRC 6

Fi (29) 0/0 ϕ 6
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. Against the total number of wires in the outermost
strand (excluding the filler wires), when the ratio of the
number of broken wires exceeds the following:
(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
• Change the 9-mm diameter wire rope when reduced to
8.4 mm.
• Change the 8-mm diameter wire rope when reduced to
7.5 mm.
• Change the 6-mm diameter wire rope when reduced to
5.6 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.