Manitowoc Grove GMK 5200-1, Maintenance Manual

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Maintenance work on the superstructure
8.8 Hoist ropes
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GMK5200-1
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Damage Description Cause Replacement
Loop forma-
tion (1) Outer layer wires in
the form of hair pins
are protruding from
the rope away from
the sheave. General wear due to
ageing of the rope or
consequential dam-
age as a result of
damage to the rope. Immediately replace rope if the
rope structure has been sub-
stantially altered by the loop
formations.
Loosening of
wires or
strands (2) Outer wires or
strands have
become loose. Only
the inner strands
continue to bear the
load. Corrosion or abra-
sion. Replace the rope immediately .
Other causes. The number of wire breaks
determines when the rope
must be replaced.
Knot forma-
tion (3) If there is repeatedly
occurring knot-like
thickening of the
rope; the insert
comes out fre-
quently.
Strands bear on
each other at thin
points; increased
frequency of wire
breaks. General wear due to
ageing of the rope or
consequential dam-
age as a result of
damage to the rope. Determine number of wire
breaks; replace rope
immedi-
ately if serious knot formation
occurs.
Constriction
(4) Diameter reduction
over short sections. General wear caused
by ageing of the rope. Replace rope immediately if
serious constrictions are
detected.