28
H
The wire rope does not
spool smoothly on the
cable drum.
1. The hoist may be installed too close to
the main sheave, increasing the fleet
angle above the 1½° maximum.
2. The hoist may not be mounted per-
pendicular to an imaginary line
between the center of the cable drum
and the first, or lead, sheave.
3. Opposite hand, or the wrong lay, of
wire rope could be in use.
There is a distinct advantage in apply-
ing wire rope of the proper direction of
lay. When the load is slacked off, the
coils remaining on the drum will
remain closer together and maintain a
more even layer. If wire rope of incor-
rect lay is used, the coils will spread
apart each time the load is removed.
When hoisting is resumed, the wire
rope tends to criss-cross and overlap
lower layers on the drum. This will
usually result in flattened and crushed
wire rope.
4. The hoist may have been overloaded,
causing the wire rope to take a perma-
nent set.
Check the mounting distance and fleet
angle. Reposition the hoist as needed.
Refer to "Installation" for more informa-
tion.
Consult the wire rope manufacturer for
wire rope recommendations to best suit
your application.
Replace the wire rope, and conduct
operator or rigger training as required.
TROUBLE
PROBABLE CAUSE
REMEDY
