Manitowoc 777 User Manual

Reference Only
Manitowoc Published 10-01-12, Control # 044-05 4-29
777 OPERATOR’S MANUAL SET-UP AND INSTALLATION
4
See Figure 4-17 for rest of this procedure unless otherwise
noted.
11. Lower boom butt until counterweight pivot frame is near
vertical (View A).
12. Unfold storage brackets from storage position on pivot
frame (View B).
13. Hook counterweight handling pendants onto storage
brackets (View C).
14. Raise boom butt until counterweight pivot frame is fully
lowered and disconnect counterweight lifting pendants
from lifting links (View D). Same pins are used in step
16.
15. Lower boom butt until mast is vertical.
16. Pin counterweight lifting pendants to mast for storage
(View E).
17. If crane is equipped with Series-2 counterweight,
remove carbody counterweights as follows:
a. Hook onto carbody counterweight with chain sling
— lift at four lifting lugs (View F).
b. Remove pins (View G) connecting carbody
counterweight to carbody.
c. Boom, swing, and hoist as required to disengage
slots in counterweight from lugs on carbody
(View G).
d. Lift carbody counterweight onto trailer and
disconnect chain sling.
e. Swing 180° and repeat steps 17a – 17d for other
carbody counterweight.
18. Disassemble upper counterweights (777 boom butt can
be used for this purpose).
a. Unpin and lift side boxes off lower tray — lift at
connecting pins (Figure 4-8, View A-A).
b. Lift side boxes onto trailer.
c. Lift counterweight tray onto trailer — lift at four lifting
lugs (Figure 4-8, View A or B).
WARNING
Falling Load Hazard!
Prevent crane from tipping while disassembling
counterweights:
• Do not exceed 26 ft (7.9 m) radius.
• Do not lift more than 40,000 lb (18 144 kg). Tipping or
structural damage may occur.
• Remove Series-2 counterweight in exact sequence
given in this procedure and shown in Figure 4-16,
View G.
Avoid dropping counterweights during disassembly:
• Do not lift lower tray and side boxes as a unit. Lifting
lugs may break.
• Do not lift more than two side boxes at a time. Lifting
lugs may break.

Manitowoc 777 Specifications

General

Brand	Manitowoc
Model	777
Category	Construction Equipment
Language	English