Manitowoc Published 10-01-12, Control # 044-05 4-53
777 OPERATOR’S MANUAL SET-UP AND INSTALLATION
4
JIB RIGGING GUIDE
This topic contains installation and removal instructions for
the #134 jib on the #78 boom.
The jib consists of a 15 ft (4.6 m) butt and a 15 ft (4.6 m) top,
providing a basic length of 30 ft (9.1 m). Inserts are available
to make up jib lengths of 40 – 80 ft (12.2 – 24.4 m) as shown
in Figure 4-34.
Jib offsets of 5, 15, and 25° are obtained by changing the
length of jib backstay straps, links, and pendants as shown in
Figure 4-37, View A.
Assist Crane Requirements
An assist crane is not required to assemble and disassemble
the jib on a 777 crawler crane. The 777 can be used to
assemble and disassemble its own jib.
See the Crane Weights in Section 1 of this manual for
weights of jib components.
The 777 must be in the following configuration to assemble
its own jib:
• Crane rigged as shown in Figure 4-33.
• Radius limited to 26 ft (7.9 m).
• Capacity limited to 40,000 lb (18 144 kg) to include 2-
part load line, load block, and lifting slings.
If rigged with a 5° offset, a fork-lift truck or an assist crane will
be required to raise the jib point to provide sufficient pendant
slack when connecting the backstay pendants to the boom.
WARNING
Falling Load Hazard!
Prevent crane from tipping or structural damage to
components:
• Do not exceed 26 ft (7.9) radius.
• Do not lift more than 40,000 lb (18 144 kg).
da0112.ai
Crane Counterweight (both ends, Series-2 only)
4-Leg
Chain Sling
Crawler Assembly
Operator’s
Cab
Rigging Pendant
Wire Rope Guides
Boom
Stop
30 U.S. Ton
(27 metric ton)
Assembly Block
Boom Butt
Mast
Boom
Hoist
Cylinder
Upper Counterweight
(Series-2 shown)
FIGURE 4-33
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