Yale HOISTS SHAW-BOX YKA Operation & Service Manual page 135

7 Inspection and maintenance
07.2020
Loop formations
➢ Replace wire ropes with loop formations.
Local increase of the rope diameter
➢ Replace wire ropes with the following local rope diameter increases.
≤ 5 % with wire ropes with steel core
≤ 10 % with wire ropes with fibre core
Flattening
➢ Check wire ropes with flattening daily and replace if necessary.
Kinks or tightened rope loops
➢ Replace wire ropes with kinks or tightened rope loops.
Bends
➢ Replace wire ropes with severe bends.
Damage due to the effects of heat or arcs
➢ Replace wire ropes with bluish discolouration or broken or melted wires.
Wire breakages
➢ Relieve the rope tension and bend the rope roughly by hand to the radius of the rope
pulley.
➢ Compare visible wire breakages with the number of wire breakages permitted (see
rope certificate) and replace if necessary.
Twist formation
Wire ropes must be checked daily for twist formations.
➢ Travel to the highest and lowest hook position without a load.
➢ With visible twist formations, untwist the wire rope (see section 4.13 Rope reeving
and the section section Discarding a wire rope).
135