Manitowoc National Crane 800D, Operator'S And Service Manual

Page: 91 / 256

National Crane
Published 5-27-2018 Control # 039-06 3-3
800D MAINTENANCE
as part of the periodic inspection, although an end
wrench should be used to verify that they are tight.
Other
1. Stability of unit throughout working area. Check
stability procedure in Installation Section annually or
when any change is made to crane or truck.
2. If the boom has not been disassembled and
inspected in the last
seven
years or 3,000 hours of
use, the boom is to be completely torn down to allow
a thorough inspection of the extend and retract
cables, sheaves, and pins.
HOIST CABLE INSPECTION AND
MAINTENANCE
Wire rope should be inspected frequently/daily and
periodically/yearly 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 may vary from machine
to machine and may vary based on environmental
conditions, frequency of lifts, and exposure to shock loads.
The inspection time intervals may also be predetermined by
state and local regulatory agencies.
NOTE: Wire rope may be purchased through Manitowoc
Crane Care.
Any deterioration observed in the wire rope should be noted
in the equipment inspection log and an assessment
concerning wire rope replacement should be made by a
qualified person.
Keeping Records
A signed and dated report of the wire rope’s condition at
each periodic inspection must be kept on file at all times. The
report must cover all inspection points listed in this section.
The information in the records can then be used to establish
data which can be used to determine when a wire rope
should be replaced.
It is recommended that the wire rope inspection program
include reports on the examination of wire rope removed
from service. This information can be used to establish a
relationship between visual inspection and the rope’s actual
internal condition at the time of removal from service.
Environmental Conditions
The life expectancy of wire rope may vary due to the degree
of environmental hostility and other conditions to which these
mechanical devices are subjected. Variation in temperature,
continuous excessive moisture levels, exposure to corrosive
chemicals or vapors or subjecting the wire rope to abrasive
material may shorten normal wire rope life. Frequent/
periodic inspections and maintenance of wire rope is
recommended for preventing premature wear and to insure
long-term satisfactory performance.
NOTE: Refer to Wire Rope Lubrication , page 4-3 for wire
rope lubrication requirements.
Dynamic Shock Loads
Subjecting wire rope to abnormal loads beyond the
endurance limit will shorten the wire 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 3-1.
WARNING
Worn or Damaged Equipment Hazard!
Never use a worn or damaged wire rope. Death or serious
injury could result from using worn or damaged wire rope.
THESE BOLTS ARE
LOCATED BELOW
THE LIFT CYLINDER
9375
!
Fo
r
Reference
Only