Manitowoc MLC150-1, Руководство по техническому обслуживанию

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Manitowoc
Published 03-21-2021, Control # 264-01
5-41
MLC150-1 SERVICE/MAINTENANCE MANUAL HOISTS
5
- Take special care to observe the boom hoist ropes
and rotation-resistant ropes for evidence of core
failure or other deterioration (remove from service)
- Internal deterioration of rotation-resistant ropes may
not be readily observable
• Throughout the day, observe the wire rope during
operation, particularly at the following locations:
a. Repetitive wear points, such as the following:
- Flange step-up, crossover, repetitive pickup
points on drums
- Reverse bends in the reeving systems
- Equalizer sheaves
- End connections
- Sheave or drum groove wear or corrugation
b. Known wear areas based on previous experience or
inspections
c. Locations where rope vibrations are reduced, such
as the following:
- Sections is contact with equalizer or other
sheaves where rope travel is limited
- Sections of the rope at or near end connections
where corroded or broken wires may protrude
- Rope at the reverse bends in the boom hoist or
luffing hoist reeving
- Repetitive pickup points, crossovers, and
change of layers at flanges on the drums
- Fleeting or deflector sheaves
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 5-40
• Inspection of the rope diameter (see Reduction in the
Rope Diameter on page 5-42 )
• Comprehensive examination for broken wires (see
Broken Rope Wires on page 5-42 )
• 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 5-42 ).
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
- Power line contact
• Exposure to abuse and shock loads, such as:
- High-velocity movement, such as hoisting or
swinging a load followed by abrupt stops
- Suspending loads while traveling over irregular
surfaces such as railroad tracks, potholes, and
rough terrain
- Moving a load that is beyond the rated capacity of
the lifting mechanism (overloading)
NOTE: Inspection intervals may also be predetermined by
state and local regulatory agencies.
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.
REFERENCE
ONLY