© 2003 Manitowoc Cranes, Inc.
Rev. 10-06-2003 Folio 1316-1
BOOM, JIB, TOWER, AND MAST
INSPECTION/REPAIR
TABLE OF CONTENTS
GENERAL
Crane owners are to use this publication as a guide for
properly inspecting and repairing boom, jib, tower, and mast
sections in the field.
For inspection or repair procedures not covered in this
publication, contact your Manitowoc Distributor.
EXTENT OF REPAIR
Field repair is limited to replacing damaged lacings, but only
if the following conditions are complied with:
• The lacings are ordered from Manitowoc Cranes.
• The welding is done by
competent welders
qualified to
work with the types of steel involved.
We recommend
that welders be qualified per Section 5 of AWS D1.1
Structural Steel code or an equivalent code.
• The welding procedures and specifications contained in
this publication are followed.
ORDERING LACINGS
Lacings are made of various high strength materials. To
ensure that replacement lacings are of the proper type and
size, lacings must be ordered from a Manitowoc Distributor.
Refer to Folio 823 for information on ordering lacings.
INSPECTION INTERVALS
Regular inspection is necessary to ensure that the
attachment can safely lift its rated load. Inspection should be
performed by a
qualified person
at the following intervals:
• Routinely on a weekly basis (this interval can vary
depending on operating conditions, application, and
crane history).
• Prior to initial use.
• After transport.
• After an overload or shock load condition has occurred.
• If the attachment has come into contact with another
object (for example: power lines, building, another
crane).
• If the attachment has been struck by lightning.
INSPECTION GUIDELINES
1. Position the crane on a level surface.
2. Block the attachment so it is level; blocking should be
placed under each connection point to eliminate all sag.
3. Thoroughly clean the attachment of all dirt, grease, oil,
etc. so a thorough inspection can be made.
4. Visually inspect the entire attachment looking for the
following types of damage:
a. Dents in lacings, chords, and platework.
b. Corrosion or abrasion in lacings, chords, and
platework.
c. Bent, kinked, or distorted lacings, chords, and
platework.
General.............................................................................1
Extent of Repair................................................................1
Ordering Lacings ..............................................................1
Inspection Intervals...........................................................1
Inspection Guidelines .......................................................1
Replacement Specifications .............................................2
Dents..........................................................................2
Gradual and Sweeping Bends....................................2
Kinks ..........................................................................4
Cracks and Breaks.....................................................4
Corrosion and Abrasion .............................................5
Chord Straightness ....................................................6
Welding Electrodes ....................................................7
Replacing Lacings......................................................8
WARNING
Component Failure!
If damage was caused by overload or shock load or if
there is damage to other major structural components, we
recommend that a thorough inspection be made by a
qualified person. A nondestructive test of all critically
stressed members must be made.
WARNING
Component Failure!
No welding shall be done to chord members or platework,
except to attach lacings. No chord member or platework
may be replaced in whole or in part. Complete section
must be replaced if chord members or platework do not
comply with specifications given in this publication.
395143
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