Manitowoc 777 Service And Maintenance Manual

Reference Only
BOOM 777 SERVICE MANUAL
4-12 Published 10-01-2012, Control # 045-08
Kinks
Refer to Figure 4-12.
Kinked lacings must be replaced; do not bend kinked lacings
back into alignment.
If any chord or platework is kinked, contact Manitowoc Crane
Care for approved repair instructions. Do not bend kinked
chords or platework back into alignment.
Cracks and Breaks
Refer to Figure 4-13.
Cracked and broken lacings must be replaced; do not
attempt to repair cracked or broken lacings.
If any chord or platework is cracked or broken, contact
Manitowoc Crane Care for approved repair instructions. Do
not attempt to repair cracked or broken chords or platework.
Chord Straightness
Refer to Figure 4-14.
If visual inspection indicates that a chord may not be straight,
proceed as follows:
1. Remove the suspect lattice section from the attachment.
2. Place wood blocks or steel plates having the same
thickness against both ends of the section (X
1
and X
2
).
3. Stretch a line (string or wire) over the outside of the
wood blocks or steel plates.
4. Stretch the line as tight as possible and tie it off at both
ends.
5. Measure the distance from the chord (on either side of
lacing intersection) to the line as shown in Figure 4-14.
6. Measurements must be taken in two planes at each
chord (dimensions A and B). To eliminate the effect of
sag in the line, take all measurements in the horizontal
plane.
7. Take the first set of measurements, then roll the insert
over 90 degrees, and take the second set of
measurements.
8. Tubular and angular chords must not deviate from
straight more than plus or minus 3/16 in (4.8 mm) at any
lacing intersection (dimension A). Deviation between
any two adjacent lacings must not exceed plus or minus
3/16 in (4.8 mm).
9. On angular chords, waviness at toe of chord (dimension
B) must not deviate from straight more than plus or
minus 1/4 in (6.4 mm) at any point. Furthermore,
waviness between any two adjacent lacings must not
exceed plus or minus 1/4 in (6.4 mm).
Gradual and sweeping bends in chords can be
straightened by cold bending them back into alignment.
Take care not to kink or further damage the chords.
FIGURE 4-12
P323
Kink
KINKED LACING
FIGURE 4-13
P324
Lacing Broken Away
from Top Chord
BROKEN LACING

Manitowoc 777 Specifications

General

Brand	Manitowoc
Model	777
Category	Construction Equipment
Language	English