Manitowoc 2250 Service And Maintenance Manual

Reference Only
Manitowoc Published 11-06-15, Control # 040-13 5-27
2250 SERVICE/MAINTENANCE MANUAL HOISTS
5
• End Attachments — the point where a fitting is
attached to the wire rope or the point where the wire
rope is attached to the drum.
• Abuse Points — the point where the wire rope is
subjected to abnormal scuffing and scraping.
Inspect all rope which can be reasonably expected to be in
use during operation for obvious damage which poses an
immediate hazard, such as the following:
• Rope distortion such as kinking, crushing, un-stranding,
bird caging, main strand displacement, and core
protrusion.
Loss of rope diameter and unevenness of the outer
strands indicate that the rope should be replaced.
• Corrosion (clean and lubricate)
• Broken or cut strands
• Broken wires (see Periodic Inspection topic for
additional information)
• Core failure in rotation resistant rope (indicated by lay
lengthening and reduction in diameter).
Periodic Inspection
The periodic inspection interval must be determined by a
qualified inspector and be based on the following factors:
• Expected rope life as indicated by the rope manufacturer
or past experience as determined by a qualified
inspector
• Severity of environment in which the rope is operated
• Size, nature, and frequency of lifts
• The rope’s exposure to shock loading and other abuse
• Rope maintenance practices
The periodic inspection must be performed at least
annually.
During the periodic inspection, the entire length of wire rope
must be inspected for the following types of damage. Any
damage found must be recorded and a determination made
as to whether continued use of the rope is safe.
• All points listed under frequent inspection
• Reduction in rope diameter below the nominal diameter
caused by loss of core support, internal or external
corrosion, or wear of the outside wires
• Severely corroded or broken wires at end attachments
• Severely corroded, cracked, bent, worn, or improperly
applied end attachments
Inspecting Rope Not In Regular Use
Wire rope must be given a complete inspection if it has been
idle for a month or more due to shutdown or storage of the
crane on which the rope is installed. The inspection must be
performed by a qualified inspector looking for the damage
identified under both Frequent and Periodic Inspection.
Replacing Wire Rope
The final decision as to when a wire rope should be replaced
is the responsibility of the qualified inspector. Discovery of
any of the following conditions is sufficient reason for
questioning a wire rope’s safety and for replacing it.
Wire Rope Diameter
Measure and record the diameter of a new wire rope after
initial loading for comparison with future inspections. A
reduction in rope diameter is often the first outward sign that
the wire rope core is damaged. When reduction in diameter
is noted, the rope must be removed from service.
Measure the rope’s diameter across crowns of the strands so
the true diameter is measured as shown in Figure 5-22
.
Wire rope must be taken out of service when the
reduction from its nominal diameter is more than 5
percent.
Broken Wires
Thoroughly clean the wire rope so breaks can be seen.
Relax the rope, move it off “pick-up points,” and flex it as
much as possible. Use a sharp awl to pick and probe
between wires and strands, lifting any wire which appears
loose or moves excessively.
Wire rope shall be taken out of service when it has the
following number of broken wires:
See Figure 5-23
for an explanation of lay length.
FIGURE 5-22
WRONG
A925
RIGHT

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English