Manitowoc Published 10-01-2012, Control # 045-08 4-9
777 SERVICE MANUAL BOOM
4
If weld arcing at the boom hoist cylinders is detected,
carefully inspect the cylinders for damage: pitting in rods,
leakage at rod seals, cylinder drift (internal leakage). If
damage is found, contact the Service Department at
Manitowoc Cranes for repair/replacement instructions.
BOOM AND JIB INSPECTION AND LACING
REPLACEMENT
Crane owners should use this section as a guide for properly
inspecting and repairing lattice sections in the field.
For inspection or repair procedures not covered in this
publication, contact your Manitowoc distributor.
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.
d. Cracked lacings, chords, and platework.
e. Cracked welds.
5. Closely examine those areas where the paint is chipped,
wrinkled, or missing and where faint rust lines or marks
appear.
6. Fill in the inspection checklist at the end of this
publication and make a detailed report of the type and
degree of damage found.
7. Repair or replace damaged lattice sections.
Replacement Criteria
Refer to the Lacing Drawings in the Attachment Section of
the Parts Manual supplied with your crane for the wall
thickness of tubular lacings and chords.
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
Structural Failure!
If damage not within allowable criteria is found, do not
operate crane until appropriate lattice section has been
properly repaired or replaced.
Operating crane with damaged lattice sections can result
in structural failure or collapse of attachment.
CAUTION
Lacing Replacement!
Any lacings damaged beyond the allowable criteria given
in this publication must be replaced.
Contact Manitowoc Crane Care for any damage to chords
or platework exceeding the allowable criteria contained in
this publication. Special instructions are required for repair
or replacement of these components.
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