Manitowoc National Crane NBT40 Series Service Manual

National Crane Published 8-01-2017 Control # 287-11 1-23
NBT40 SERVICE MANUAL INTRODUCTION
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applications of a suitable rope lubricant are required. The
wire rope lubricant should have the following characteristics:
• Be free from acids and alkalis and should have sufficient
adhesive strength to remain on the ropes.
• Be of a viscosity capable of penetrating the interstices
between wires and strands.
• Not be soluble in the medium surrounding it under the
actual operating conditions (i.e. water).
• Have a high film strength.
• Resist oxidation.
Remove dirt from the rope before applying lubrication. Use a
stiff wire brush and solvent, compressed air, or live steam to
clean the rope. Lubricate the rope immediately after
cleaning. Methods of lubrication are bath, dripping, pouring,
swabbing, painting, or pressure spray (Figure 1-5). Apply the
lubricant at the top bend in the rope because at that point the
strands are spread and more easily penetrated. Do not
lubricate a loaded rope. The service life of wire rope is
directly proportional to the amount of lubricant reaching the
working parts of the rope.
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 CraneCARE. 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
as referenced by Federal Government Agencies.
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
CraneCARE.
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.
• General corrosion.
FIGURE 1-5
Reference Only

Manitowoc National Crane NBT40 Series Specifications

General

Brand	Manitowoc
Model	National Crane NBT40 Series
Category	Construction Equipment
Language	English