Manitowoc National Crane NBT30H-2, Service Manual

Page: 37 / 194

National Crane
03-20-2019 Control # 613-06
1-27
NBT30H-2 SERVICE MANUAL INTRODUCTION
1
10
Recommendations for Servicing Wire Rope
• Lock out equipment power when removing or installing
wire rope assemblies.
• Use safety glasses for eye protection.
• Wear protective clothing, gloves, and safety shoes.
• Use supports and clamps to prevent uncontrolled
movement of wire rope, parts, and equipment.
• When replacing fixed length cable assemblies (e.g.
pendants) having permanently attached end fittings, use
only pre-assembled lengths of wire rope as supplied
from Manitowoc Crane Care. Do not build lengths from
individual components.
• Replace an entire wire rope assembly. Do not attempt to
rework damaged wire rope or wire rope ends.
• Never electroplate wire rope assemblies.
• Do not weld wire rope assemblies or components unless
recommended by the wire rope manufacturer.
• Do not allow welding spatter to come in contact with the
wire rope or wire rope ends.
• Do not allow the wire rope to become an electrical path
during other welding operations.
• Wire ropes are manufactured from special steels. If the
wire rope is heated, discard the entire length of rope.
• Wire rope sets must be replaced as a set.
• Do not paint or coat wire ropes with any substance
except approved lubricants.
Wire Rope Inspection
Inspect wire rope in accordance with the following
information excerpted from a National Consensus Standard
a s r e f e r e n c e d b y F e d e r al G o v e r n m e n t A g e n c i e s .
Recommended inspection intervals depend on the machine,
environmental conditions, frequency of lifts, and exposure to
shock loads. The inspection intervals may also be
predetermined by state and local regulatory agencies.
NOTE: Wire rope is available from Manitowoc Crane Care.
Record any deterioration of the wire rope in the equipment
inspection log. Determination of wire rope replacement must
be made by a qualified person.
Daily Inspection
A daily visual inspection is recommended for all ropes in
service. Use the daily inspection to monitor progressive
degradation and to identify damages that require wire rope
replacement such as:
• Distortion, kinking, crushing, un-stranding, bird caging,
reduction of diameter, etc.
• Significant corrosion.
• Broken or cut strands.
• Number, distribution and type of broken wires.
• Evidence of core failure.
• Significantly corroded, cracked, bent, or worn end
connections.
• Improperly applied end connections.
Yearly Inspection
Inspect the total length of wire rope annually or more often if
necessitated by adverse conditions. Only inspect the outer
surface of the wire rope. Do not attempt to open the strands
of the rope. Items to include in the yearly inspection are
items listed in the daily inspection plus the following:
• reduction of rope diameter below nominal diameter.
• severely corroded or broken wires at end connections.
• severely corroded, cracked, bent, worn, or improperly
applied end connections.
• areas subjected to rapid deterioration such as:
FIGURE 1-9