Manitowoc Published 10-01-12, Control # 044-05 4-45
777 OPERATOR’S MANUAL SET-UP AND INSTALLATION
4
Boom Installation
Assemble Boom
The boom sections have FACTâ„¢ connectors:
• The top connectors are joined by fixed vertical pins that
hook into holes in the adjacent section (Figure 4-28,
View A).
• The bottom connectors are joined by removable
horizontal pins (Figure 4-28, View F).
Assemble the inserts, starting with the inserts closest to the
boom butt and moving out toward the boom top.
1. If not already done, install rope guards on top of boom
sections as shown in Figure 4-27, View B. See Table 4-2
for number of rope guards required on each insert.
Additionally, two rope guards are required on boom top.
2. Assemble boom inserts in proper sequence
(Figure 4-31), as follows, starting at butt end of boom:
a. Place first insert on blocking approximately 6 in.
(152 mm) high.
b. Lift next insert into position and engage top
connector holes with fixed vertical pins as shown in
Figure 4-28, View A.
c. Lower insert until bottom connector holes are
aligned and install removable horizontal pins as
shown in Figure 4-28, View F.
d. Block under bottom chords at top end of insert.
e. Repeat steps 2a – 2d until all inserts and boom top
have been installed.
3. Intermediate suspension is required for boom lengths of
190 – 270 ft (57.9 – 82.3 m).
If intermediate suspension is required for your boom length,
install it now.
WARNING
Collapsing Boom Hazard!
To prevent death or serious injury, do not stand on, inside,
or under boom sections during assembly. Always stand
outside of boom sections when installing connecting pins.
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