Manitowoc Published 10-01-12, Control # 044-05 4-23
777 OPERATOR’S MANUAL SET-UP AND INSTALLATION
4
CRANE DISASSEMBLY
Disconnect Butt From Boom
1. Prepare crane and boom as follows:
a. Position crane in disassembly area.
b. If required per capacity chart, travel crawler front
rollers or rear tumblers onto blocking (Figure 4-13,
View A).
See Crawler Blocking Diagram in Capacity Chart
Manual for blocking requirements.
2. Lower boom and jib (if equipped) onto blocking at
ground level.
a. If equipped with a jib, disengage jib stop pins before
jib point contacts ground or damage will result (see
Jib Rigging Guide in this section for procedure).
b. If equipped with an upper boom point, remove lower
connecting pins (Item B, Figure 4-28, View C)
before boom point contacts ground, or damage will
result.
c. Place blocking approximately 6 in. (152 mm) high
under bottom chords at connecting pins between
top and adjacent insert as boom is lowered.
3. If equipped with intermediate suspension, lower strut as
follows:
a. Boom up so intermediate suspension strut is in
tension (Figure 4-29, View E).
b. Remove pins to disengage inside latches from
intermediate suspension beam (Figure 4-29,
View F).
c. Slowly boom down until strut is resting in supports
(Figure 4-29, View C).
4. Continue to lower mast (boom down) until boom
pendants are slack (Figure 4-13, View A) and pendant
links on end of mast are accessible.
5. Disconnect boom electrical cord from cable reel on
boom butt and connect cord to junction box on rotating
bed (Figure 4-14, View A).
6. Remove block-up limit assembly and spool electrical
cord onto reel on boom butt.
7. Disconnect load lines from load block and weight ball
and spool load lines onto load drums.
8. Disconnect boom pendants from pendant links
(Figure 4-13, View C). Lay pendants on top of boom.
9. Unpin rigging pendants from storage position on mast
(Figure 4-13, View B).
10. Connect rigging pendants to upper wire rope guide
(Figure 4-14, View B).
11. Slowly raise mast (boom up) until rigging pendants are
taut and bottom connector pins at boom butt are loose
(Figure 4-13, View D).
12. Remove bottom connector pins (Figure 4-13, View E).
13. Slowly boom down to lower boom onto blocking 8 – 10
in. (203 – 254 mm) high (Figure 4-13, Views E and F).
14. Continue to boom down to disengage fixed vertical pins
in butt from connecting holes in adjacent boom section
(Figure 4-13, View G).
15. Slowly travel several feet in reverse.
WARNING
Tipping Hazard!
Prevent crane from tipping over:
• Block crawlers if required per capacity chart before
lowering boom.
WARNING
Falling Strut Hazard!
Do not attempt to remove strut latch pins until strut is in
tension. Strut will drop suddenly with considerable force if
this step is ignored.
WARNING
Moving Part Hazard!
Prevent serious crushing injury:
• Do not stand inside boom while removing connector
pins — STAND OUTSIDE BOOM.
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