MAINTENANCE CHECKLIST OPERATOR MANUAL NBT60XL
6-4 Published 11-01-2020 Control # 710-00
chemicals or vapors or subjecting the rope to abrasive
material may shorten normal rope life. Frequent/periodic
inspections and maintenance of rope is recommended for
preventing premature wear and to insure long-term
satisfactory performance.
NOTE: Refer to Wire Rope Lubrication, page 5-11 for wire
rope lubrication requirements.
Dynamic Shock Loads
Subjecting rope to abnormal loads beyond the endurance
limit will shorten the rope life expectancy. Examples of this
type of loading are listed below.
• High velocity movement, for example; hoisting or
swinging of a load followed by abrupt stops.
• Suspending loads while traveling over irregular surfaces
such as railroad tracks, potholes, and rough terrain.
• Lifting a load that is beyond the rated capacity of the
lifting mechanism, such as overloading.
Precautions and Recommendations During
Inspection
• Always use safety glasses for eye protection.
• Wear protective clothing, gloves, and safety shoes as
appropriate.
• Measure the rope’s diameter across crowns of the
strands when determining if rope has become damaged,
refer to Figure 6-1.
Inspection
All hoist rope in service needs to be inspected on a daily,
monthly, and quarterly basis. Rope which has been idle for a
period of a month or more must be given a thorough
inspection before it is placed in service. These inspections
should cover all types of deterioration including:
• Distortion such as kinking, crushing, un-stranding, bird
caging, main strand displacement or core protrusion.
• Loss of rope diameter in a short rope length or
unevenness of outer strands indicates the rope needs to
be replaced.
• Significant corrosion.
• Broken or cut strands.
• Number, distribution and type of visible broken wires.
• Core failure in rotation resistant ropes.
• Prior electrical contact with a power line or other electric
arc damage.
• Significantly corroded, cracked, bent, or worn end
connections.
Only inspect the outer surface of a rope. Never attempt to
open the rope.
Pay particular attention to areas of the rope where wear and
other damage is likely to occur:
• Pick-up Points: Sections of wire rope that are repeatedly
stressed during each lift, such as those sections in
contact with sheaves.
• End Attachments: The point where a fitting is attached to
the wire rope or the point where the wire rope is attached
to the hoist drum.
• Abuse Points: The point where the wire rope is
subjected to abnormal scuffing and scraping.
Daily Inspections
All rope in continuous service must be inspected at the
beginning of each work day. Inspect the wedge socket and
length of rope that is used in daily operation. The end should
be inspected for abrasion, corrosion, broken wires, and
loose or broken servings. Inspect the remainder of the rope
length used for daily operations for points showing kinks,
sharp bends, or any other evidences of damage or excessive
wear.
Monthly Inspections
Inspect the wedge socket and length of rope normally used
in daily operations. Examine the rest of the rope for kinked,
crushed or otherwise damaged points.
Periodic Inspections
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. Periodic inspection should include all previous
items listed under Inspection, plus the following:
• Inspect for severely corroded or broken wires at end
connections.
- Reduction of rope diameter below nominal
diameter.
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Reference
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