Manitowoc 2250 Service Maintenance Manual

Reference Only
Manitowoc Published 07-19-16, Control # 249-01 5-29
2250 SERVICE/MAINTENANCE MANUAL HOISTS
5
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 that appears loose or
moves excessively.
See Figure 5-26
for an explanation of lay length.
Wire rope must be taken out of service when it has the
following number of broken wires:
• Running ropes (working lines)—Six randomly distributed
broken wires in one lay length, or three broken wires in
one strand of one lay length
• Rotation resistant rope—Two randomly distributed
broken wires in a length equal to six rope diameters or
four randomly distributed broken wires in a length equal
to thirty rope diameters
• Standing ropes (pendants)—More than two broken
wires in one lay length in sections beyond the end
attachment, or more than one broken wire at the end
attachment (Figure 5-27
)
• All ropes—One broken wire at the point of contact with
the core that protrudes or loops out of the rope structure
United States Steel states, “Replacement criteria for
galvanized strand boom suspension pendants are 25
percent of the outer wires fractured, or 10 percent of the total
numbers, whichever comes first.”
FIGURE 5-26
A925
Lay length is the distance measured along the rope in which
one strand makes one complete revolution around the core.
Core
One
Wire
One Strand
WARNING
Falling Load Hazard!
If wire rope is damaged, it can break, causing the load to
drop, thereby resulting in death or serious injury.
Replace the wire rope when more than one broken wire
appears at the points marked by the arrows.
FIGURE 5-27
S140
S142
S141
S143
S4412-144
Swage Socket
Wedge Socket
Poured Zinc Socket
Hand Splice
Button Socket

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English