Page 202 2
nd
Edition – Rev 0
20-20
CONTROL CABLE – MAINTENANCE PRACTICES
External wear patterns
Wear will normally extend along cable equal to the distance cable moves at location. Wear
may occur on one side of the cable only or on its entire circumference. Replace flexible and
non-flexible cables when individual wires in each strand appear to blend together (outer wires
worn 40-50%) as depicted in in the figure below.
Internal cable wear
As wear is taking place on the exterior surface of a cable, the same condition is taking place
internally, particularly in the section of the cable which pass over pulleys and quadrants. This
condition, shown in Figure 3, is not easily detected unless the strands of cable are separated.
Wear of this type is a result of the relative motion between inner wire surfaces. Under certain
condition the rate of this type wear can be greater than that occurring on the surface. The
figures below are indicative.
Figure 2. - External cables wear
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