BOOM, JIB, TOWER, AND MAST
Folio 1316-2
d. Cracked lacings, chords, and platework.
e. Cracked welds.
f. Twisted sections.
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 Boom, Jib, Tower, and Mast Inspection
Checklist (Folio 1354) and make a detailed report of the
type and degree of damage found.
7. Repair or replace damaged sections.
REPLACEMENT SPECIFICATIONS
Refer to Table 1 for the wall thickness of tubular lacings and
chords on various attachments. For attachments not listed,
refer to Lacing Drawings in your Parts Manual or contact
your Manitowoc Distributor.
Dents
Refer to Figure 1.
For tubular lacings or chords, dents must not be deeper than
the lacing wall thickness or 1/8 in. (3.2 mm), whichever is
less.
For angular lacings or chords and all platework, dents must
not be deeper than 1/8 in. (3.2 mm).
Gradual and Sweeping Bends
Refer to Figure 2.
For tubular lacing, gradual and sweeping bends must not
deviate from straight more than 5 percent of the lacing
diameter.
For angular lacing, gradual and sweeping bends must not
deviate from straight more than 5 percent of the angle leg
length.
Gradual and sweeping bends in lacings can be straightened
by cold bending them back into alignment. Take extreme
care not to kink or further damage the lacings.
WARNING
Structural Failure!
If damage not within specification is found, do not operate
crane until appropriate section has been properly repaired
or replaced.
Operating crane with a damaged section may result in
structural failure or collapse of boom, jib, tower, or mast.
CAUTION
Lacing Replacement!
Damaged lacing must be replaced if it meets replacement
specifications contained in this publication. Entire section
of attachment must be replaced if any chord or platework
does not meet replacement specifications.
FIGURE 1
P322
Dent
DENTED LACING
FIGURE 2
B231
Straight
Line
BENT LACING
Bent
Lacing
395143
To Next Page
Loading...
