SWDM40 OPERATION & MAINTENANCE MANUAL
discarded or not in accordance with “GB/T5972 Inspection and Discard Regulation for
Wire Rope used by Crane Machinery”.
Inspect the section of wire rope which is draw forth from the fixed end, the fixed
device for deformation or abrasion, and internal and rope end for broken wire or
corrosion, meanwhile, ensure wedge joints and rope clamp are secure (dismountable
device: wedge joint, rope clamp, press plate and etc.).
Check rope end device for requirements of related standard, visual inspect joint for
broken wire, if found near or in the rope end device, shorten the wire rope and then
install it onto the fixed device. Keep in mind that the length of wire rope should long
enough to wind on the drum at least for 1.5 to 2 circles, normally 3 circles.
8.3.7 Discarding Criteria of Wire Rope
Following rules should be observed to determine the problem of wire rope:
The wire rope without load is straight, with load is twisted: the problem of wire rope.
The wire rope with load is straight, without load is twisted: the problem of the
machine.
Generally, the serious damaged section is only the shorter part after the first layer and
the second layer of wire rope wind together on the drum. The left part of wire rope is
OK to use, though, the whole rope should be discarded.
Determine to discard the wire rope according to the broken wire, abrasion and
corrosion, replace the rope immediately if one of following conditions occurs.
FIG. 8-3-7 broken wire
Broken wire exists most within the rope range of 6d (d for wire rope diameter).
Broken wire occurs after used for a while and increase gradually, the wire rope should
be discarded in time according to the criteria.
The whole strand of wire rope is broken.
Rope diameter is decreased by damaged rope core.
Determine to discard the wire rope according to the criteria, such as reduction in rope
elasticity etc.
When the outer layer of wire rope has been abraded for 40% of rope diameter, the
diameter has reduced 7% or more.
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