Manitowoc Grove GMK 5250L Maintenance Manual page 292

Maintenance work on the superstructure
8.8 Hoist ropes
Damage
Loop forma- Outer layer wires in
tion (1) the form of hair pins
are protruding from
the rope away from
the sheave.
Loosening of Outer wires or
wires or strands have
strands (2) become loose. Only
the inner strands
continue to bear the
load.
Knot forma- If there is repeatedly
tion (3) 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.
Constriction Diameter reduction
(4) over short sections.
8 - 64
Description
General wear due to
ageing of the rope or
consequential dam-
age as a result of
damage to the rope.
Corrosion or abra-
sion.
Other causes.
General wear due to
ageing of the rope or
consequential dam-
age as a result of
damage to the rope.
General wear caused
by ageing of the rope.
Cause
3 302 744 en
Replacement
Immediately replace rope if the
rope structure has been sub-
stantially altered by the loop
formations.
Replace the rope immediately.
The number of wire breaks
determines when the rope
must be replaced.
Determine number of wire
breaks; replace rope immedi-
ately if serious knot formation
occurs.
Replace rope immediately if
serious constrictions are
detected.
Maintenance manual
GMK5250L