Manitowoc Published 10-09-2020, Control # 259-06 5-33
MLC80A-1/MLC90A-1/MLC100A-1/MLC100-1 SERVICE/MAINTENANCE MANUAL HOISTS
Periodic Comprehensive Inspection
The comprehensive inspection must be done by a qualified
person. The inspection must include pulling all the rope off
the drum and carefully inspecting the entire length.
The inspection must include the following:
• All points listed under Daily Inspection on page 5-32
• Inspection of the rope diameter (see Reduction in the
Rope Diameter on page 5-34)
• Comprehensive examination for broken wires (see
Broken Rope Wires on page 5-34
)
• End connections. Check for broken wires or severely
corroded, cracked, bent, worn, or improperly applied
end connections
• Areas subjected to rapid deterioration are as follows:
- Sections in contact with the saddles, equalizer
sheaves, or other sheaves where the wire rope
travel is limited
- Sections of the wire rope at or near the terminal
ends where corroded or broken wires may protrude
• Inspection of the boom sheaves, hook block sheaves,
gantry/mast sheaves, boom extension/jib sheaves, jib
strut sheaves, and hoist drums for wear
NOTE: Damaged sheaves or hoist drums can accelerate
wear and cause rapid deterioration of the wire
rope.
Any damage of the wire rope found must be recorded and a
determination made as to whether continued use of the rope
is safe (refer to Replacement Criteria on page 5-34
).
Determining the Frequency of Inspection
Intervals for comprehensive inspections may vary from
machine to machine. The inspection interval must be
determined by a qualified person and must be based on such
factors as the following:
• Expected rope life as determined by experience on the
particular installation or similar installations
• Size, nature, and frequency of lifts
• Rope maintenance practices
• Severity of the environment, such as the following:
- Variation in the temperature
- Continuous excessive moisture levels
- Exposure to corrosive chemicals or vapors
- Subjecting the wire rope to abrasive material
Item Description
1 Dog-Leg or Kink
2Drum Abrasion
3 Drum Crushing
4 Sheaves Too Small
5Corrosion
6 Bird Cage (sudden release of load)
FIGURE 5-21
WARNING
Falling Load Hazard!
All wire rope will eventually deteriorate to a point where it
is no longer usable.
• As a wire rope approaches the end of its useful life,
do inspections more frequently.
• A comprehensive inspection of each wire rope must
be performed at least once a year.
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