Manitowoc CD25, Руководство оператора, Страница: 113 / 160

6-3
CD25 MAINTENANCE
6
Published 1-06-2017 Control # 579-01
During fabrication, ropes receive lubrication; the kind and
amount depends on the rope’s size, type, and anticipated
use. This in-process treatment will provide the finished rope
with ample protection for a reasonable time if it is stored
under proper conditions. But, when the rope is put into
service, the initial lubrication may be less than needed for the
full useful life of the rope. Because of this possibility, periodic
applications of a suitable rope lubricant are necessary.
The following are important characteristics of a good wire
rope lubricant:
• It should be free from acids and alkalis.
• It should have sufficient adhesive strength to remain on
the rope.
• It should be of a viscosity capable of penetrating the
interstices between wires and strands.
• It should not be soluble in the medium surrounding it
under the actual operating conditions (i.e. water).
• It should have a high film strength.
• It should resist oxidation.
Before applying lubrication, accumulations of dirt or other
abrasive material should be removed from the rope.
Cleaning can be accomplished by using a stiff wire brush and
solvent, compressed air, or live steam. Immediately after the
wire rope is cleaned, it should be lubricated. Many
techniques may be used; these include bath, dripping,
pouring, swabbing, painting or pressure spray methods.
Whenever possible, the lubricant should be applied at the
top of a bend in the rope, because at that point the strands
are spread by bending and are more easily penetrated.
There should be no load on the rope while it is being
lubricated. It should be noted, the service life of wire rope will
be directly proportional to the effectiveness of the method
used and amount of lubricant reaching the working parts of
the rope.
Precautions and Recommendations During
Inspection or Replacement
• Always lock out equipment power when removing or
installing wire rope assemblies.
• Always use safety glasses for eye protection.
• Wear protective clothing, gloves, and safety shoes as
appropriate.
• Use supports and clamps to prevent uncontrolled
movement of wire rope, parts, and equipment.
• When replacing fixed length cable assemblies (e.g.
pendants) having permanently attached end fittings use
only pre-assembled lengths of wire rope as supplied
from Manitowoc. Do not build lengths from individual
components.
• Replace an entire wire rope assembly. Do not attempt to
rework damaged wire rope or wire rope ends.
• Never electroplate wire rope assemblies.
• Do not weld any wire rope assembly or component
unless welding is recommended by the wire rope
manufacturer. Welding spatter shall never be allowed to
come in contact with the wire rope or wire rope ends. In
addition, be sure that the wire rope is not an electrical
path during other welding operations.
• Wire ropes are manufactured from special steels. If
heating a wire rope assembly is absolutely necessary for
removal, the entire wire rope assembly shall be
discarded.
• On systems equipped with two or more wire rope
assemblies operating as a matched set, they shall be
replaced as an entire set.
• Do not paint or coat wire ropes with any substance
except approved lubricants.
• Measure the rope’s diameter across crowns (1) of the
strands when determining if rope has become damaged
(Figure 6-1).
• When checking for broken wires (5) (Figure 6-2) relax
the rope, move it off “pick-up points”, and flex it as much
as possible. Defect in the rope is spoke of in relations to
“Lay Length” (2) which is the distance measured along
rope in which one strand (3) makes one complete
revolution around the core (4).
A925
1
FIGURE 6-1
Reference Only