Grove
Published 1-20-2017, Control# 483-02
11-13
CD5515-2/YB5515-2 SERVICE MANUAL
STRUCTURALS
11
9.
In the U.S.A., regular INSPECTIONS of the wire rope
and keeping of PERMANENT RECORDS SIGNED BY
A QUALIFIED PERSON ARE REQUIRED BY OSHA
FOR ALMOST EVERY WIRE ROPE APPLICATION.
The purpose of the inspection is to determine whether or
not a wire rope may continue to be safely used on the
application. Inspection criteria, including number and
location of broken wires, wear and elongation, have
been established by OSHA, ANSI, ASME and similar
organizations.
IF IN DOUBT, REPLACE THE ROPE. An inspection
should include verification that none of the specified
removal criteria for this usage are met by checking for
such things as:
•
Surface wear; nominal and unusual.
•
Broken wires; number and location.
•
Reduction in diameter.
•
Rope stretch (elongation).
•
Integrity of end attachments.
•
Evidence of abuse or contact with another object.
•
Heat damage.
•
Corrosion.
In addition, an inspection should include condition of
sheaves, drums and other apparatus with which the wire
rope makes contact.
10.
When a wire rope has been removed from service
because it is no longer suitable for use, it must not be
reused on another application.
11.
Every wire rope user should be aware of the fact that
each type of fitting attached to a wire rope has a specific
efficiency rating which can reduce the working load of
the wire rope assembly or rope system, and this must be
given due consideration.
12.
Some conditions that lead to problems in wire rope
systems include:
•
Sheaves that are too small, worn or corrugated can
cause damage to a wire rope.
•
Broken wires mean a loss in strength.
•
Kinks permanently damage a wire rope and must be
avoided.
•
Wire ropes are damaged by knots. Wire rope with
knots must never be used.
•
Environmental factors such as corrosive conditions
and heat can damage a wire rope.
•
Lack of lubrication can significantly shorten the
useful life of a wire rope.
•
Contact with electrical wires and resulting arcing will
damage a wire rope.
Inspecting Wire Rope
Inspect entire length of wire rope for any conditions listed in
Figure 11-4. If any of the conditions exist, replace the wire
rope.
If the wire rope shows severe wear, make a full inspection of
sheaves and drums for grooves, correct alignment, etc.
Inspection of Sheaves
Inspect all sheaves for wear and proper alignment.
For maximum life of the wire rope, the sheave grooves must
be smooth and must be a little larger than the diameter of the
wire rope.
As wear in the sheaves increases, the groove for the wire
rope gets smaller, NOT larger. Tracks in the sheaves are
caused by the wire rope, and the wire rope will continue to
engage the tracks (for example; like a chain engaging a
sprocket). A twist in the wire rope or a small change of lay will
prevent the wire rope from engaging the track in the sheave.
The result will be a rapid wear on the wire rope and on the
sheave.
Wire Rope Lubrication
Lubricate the wire rope with a good grade of spray wire rope
lubricant or a light weight oil. A more frequent lubrication
(more than monthly) may be required due to operating
conditions and usage.
Proper lubrication of the wire rope is just as important as
lubrication of other components. The wire rope has many
moving parts. Initial lubrication will not last throughout the life
of the wire rope. Lubrication is essential to reduce wear and
inhibit corrosion of the wires.
After cleaning, apply a light weight oil that will penetrate into
the wire rope, or a light weight oil that has been preheated to
a temperature between 18° and 36°C (60° and 100°F). Use a
brush or cloth to apply the oil.
Reference Only
