Manitowoc GROVE GMK7450 Maintenance Manual page 306

Maintenance work on the superstructure
8.12 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.
Constric- Diameter reduction
tion (4) over short sections.
8 - 104
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
3 302 577 en
Replacement
Immediately replace the rope if
the rope structure has been
substantially 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
GMK7450