Grasp the ends with end-cutting nippers and twist up
slack, as shown in step 3. Do not try to tighten the
seizing by twisting. Draw up on the seizing, as shown
in step 4. Again twist up the slack, using the nippers as
shown in step 5. Repeat steps 4 and 5 as needed. Cut the
ends and pound them down on the rope, as shown in
step 6. If the seizing is to be permanent, use a serving
bar, or iron, to increase tension on the seizing wire
when putting on the turns.
Wire rope can be cut successfully by a number of
methods. An effective and simple method is to use a
hydraulic type of wire rope cutter, as shown in figure
6-50. Remember that all wire should be seized before
it is cut. For best results in using this method, place the
rope in the cutter so the blade comes between the two
central seizing. With the release valve closed, jack the
blade against the rope at the location of the cut and
continue to operate the cutter until the wire rope is cut.
When a hydraulic type of wire cutter is NOT
available, other methods can be used. such as a
hammer-type wire rope cutter (fig. 6-51), a cutting
torch, and, if need be, a hacksaw and cold chisel.
Wire Rope Maintenance
Wire rope bending around hoist drums and
sheaves will wear like any other metal article, so
lubrication is just as important to an operating wire
rope as it is to any other piece of working machinery.
Figure 6-50.Hydraulic type of wire cutter.
Figure 6-51.Hammer-type wire rope cutter.
For wire rope to work right, its wires and strands must
be free to move. Friction from corrosion or lack of
lubrication shortens the service life of wire rope.
Deterioration from corrosion is more dangerous
than that from wear because corrosion ruins the inside
wiresa process hard to detect by inspection.
Deterioration caused by wear can be detected by
examining the outside wires of the rope, because these
wires become flattened and reduced in diameter, as the
wire rope wears.
Replace wire rope that has one third of the
original diameter of the outside individual
Both internal and external lubrication protects a
wire rope against wear and corrosion. Internal
lubrication can be properly applied only when the wire
rope is being manufactured, and manufacturers
customarily coat every wire with a rust-inhibiting
lubricant, as it is laid into the strand. The core is also
lubricated in manufacturing.
Lubrication that is applied in the field is designed
not only to maintain surface lubrication but also to
prevent loss of internal lubrication provided by the
manufacturer. The Navy issues an asphaltic petroleum
oil that must be heated before using. This lubricant is
known as Lubricating Oil for Chain, Wire Rope, and
Exposed Gear and comes in two types:
Type I, Regular: Does not prevent rust and is
used where rust prevention is not needed; for
example, elevator wires used inside are not
exposed to the weather but need lubrication.
Type II, Protective: A lubricant and an
anticorrosiveit comes in three grades: grade
A, for cold weather (60°F and below); grade B,
for warm weather (between 60°F and 80°F); and
grade C, for hot weather (80°F and above).
The oil, issued in 25-pound and 35-pound buckets
and in 100-pound drums, can be applied with a stiff
brush, or the wire rope can be drawn through a trough
of hot lubricant (fig. 6-52). The frequency of
application depends upon service conditions; as soon
as the last coating has appreciably deteriorated, it
should be renewed. A good lubricant to use when
working in the field, as recommended by
COMSECOND/COMTHRIDNCBINST 11200.11, is
a mixture of new motor oil and diesel fuel at a ratio of
70-percent oil and 30-percent diesel fuel.