INTRODUCTION RT9130E-2 SERVICE MANUAL
1-24 Published 11-22-2016, Control # 345-12
Periodic Inspection
Wire rope should be inspected periodically/annually or at a
shorter time interval if necessitated by environmental or
other adverse conditions, and shall cover the entire length of
the wire rope. Only the outer surface of the wire rope need
be inspected, and no attempt should be made to open the
rope. Periodic inspection should include all items listed
under frequent inspection plus the following:
• Inspect for reduction of rope diameter below nominal
diameter.
• Inspect for severely corroded or broken wires at end
connections.
• Inspect for severely corroded, cracked, bent, worn, or
improperly applied end connections.
• Inspect wire rope in areas subjected to rapid
deterioration such as:
- Sections in contact with saddles, equalizer sheaves,
or other sheaves where wire rope travel is limited.
- Sections of wire rope at or near terminal ends where
corroded or broken wires may protrude.
• Inspect boom nose sheaves, hookblock sheaves, boom
extension/jib sheaves, auxiliary boom nose sheaves,
and hoist drums for wear. Damaged sheaves or hoist
drums can accelerate wear and cause rapid
deterioration of the wire rope.
Wire Rope Inspection—Boom Extension
and Retraction Cables
Periodic Inspection
It is recommended that a weekly inspection of all boom
extension and retraction cables be performed using the
following guidelines. This inspection shall cover the entire
length of the extension and retraction cables. This inspection
should be used to monitor progressive degradation and to
discover severe damages necessitating wire rope
replacement or equipment repair. Inspection criteria are as
follows:
• Inspect for reduction of rope diameter below nominal
diameter.
• Inspect for severely corroded or broken wires at end
connections.
• Inspect for severely corroded, cracked, bent, worn, or
improperly applied end connections.
• Inspect wire rope in areas subjected to rapid
deterioration such as:
- Sections in contact with saddles, equalizer sheaves,
or other sheaves where wire rope travel is limited.
- Sections of wire rope at or near terminal ends where
corroded or broken wires may protrude.
- Sections of wire rope in contact with stationary
surfaces where abrasion or chafing may take place
as a result of equipment vibration.
• Inspect for damaged or wobbly boom extension and
retraction sheaves that may cause rapid deterioration of
the wire rope.
• Inspect for unusual cable sag/stretch and be sure cables
used in sets all have an equal tension applied. Repeated
need for adjustment of an individual cable is evidence of
cable stretch and indicates the need for additional and
more thorough inspection in order to determine and
correct the cause.
• The inspection shall cover all visible areas of the
extension and retraction cables of an assembled boom.
Note that extending and/or retracting the boom may be
required to access visual inspection holes. The
inspection shall cover the entire length of the extension
and retraction cables of a disassembled boom prior to
reassembly.
Wire Rope Inspection/Replacement (All Wire
Rope)
No precise rules can be given for determination of the exact
time for replacement of wire rope since many variable factors
are involved. Determination regarding continued use or
replacement of wire rope depends largely upon the good
judgement of an appointed and qualified person who
evaluates the remaining strength in a used rope after
allowance for any deterioration disclosed by inspection.
Wire rope replacement should be determined by the
following information excerpted from a National Consensus
Standard as referenced by Federal Government Agencies
and as recommended by Manitowoc. All wire rope will
eventually deteriorate to a point where it is no longer usable.
Wire rope shall be taken out of service when any of the
following conditions exist:
• Kinking, crushing, birdcaging, or any other damage
resulting in distortion of the rope structure.
• Evidence of any heat damage from any cause.
• Reductions from nominal diameter of more than 5%.
• In running ropes, six randomly distributed broken wires
in one lay or three broken wires in one strand in one lay
• In standing ropes, more than two broken wires in one lay
in sections beyond end connections or more than one
broken wire at an end connection.
• In rotation resistant rope, two randomly distributed
broken wires in six rope diameters or four randomly
distributed broken wires in 30 rope diameters.
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