Yale HOISTS SHAW-BOX YKA Operation & Service Manual page 145

7 Inspection and maintenance
Fig. 85
07.2020
The rope sheave must be replaced if the wall thickness as measured is <t min or the
groove depth as measured is > h max. Furthermore, the rope sheave must be replaced
when replacing the wire rope if the rope strands have dug into the base of the groove.
Impressions of single wires are acceptable.
A rope sheave must also be replaced if the radius of the base of the groove R has
become too small for the new rope due to reduction in diameter of the old rope or wear.
N.B.
The negative profile of the rope in the base of the groove may provide optimum contact
to the wire rope currently fitted.
Rope sheaves should be rotated without load on the rope to check the easy and
concentric running of the bearings.
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