Manitowoc Grove GMK 5250L Maintenance Manual page 291

Damage
Reduced The diameter of the
diameter (1) rope has become
smaller along large
sections.
Corkscrew- The rope winds its
type rope way along its longi-
deformation tudinal axis in a way
(2) that is similar to a
corkscrew.
Deformation is
measured with sus-
pended hook block.
Basketlike Wires of the outer
deformation layer protrude. In
(3) other areas of the
rope, the insert has
buckled or is pro-
truding from the
rope.
Maintenance manual
GMK5250L
Description
Structural changes
Corrosion or abrasion.
Damage resulting
from overloading.
Outer and inner layers
have been displaced
in relation to each
other.
Cause
3 302 744 en
Maintenance work on the superstructure
Replacement
Immediately replace the rope
if the diameter has decreased
by 15% or more compared to
the nominal diameter.
Immediately replace the rope
if the diameter has decreased
by 10% or more compared to
the nominal diameter.
Even a small amount of defor-
mation leads to increased
abrasion, wire breaks and
rough operation of the rope
drive.
If deformation "x" at a position
on the rope is greater than
a third of the rope diameter,
the rope must be replaced
immediately.
Replace the rope immediately.
8.8 Hoist ropes
s
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