Manitowoc Published 10-01-12, Control # 044-05 4-61
777 OPERATOR’S MANUAL SET-UP AND INSTALLATION
4
Raise Jib Strut
See Figure 4-38 for following procedure.
1. Using appropriate slings, attach hook from assist crane
to front side of sheave in jib strut.
2. Slowly lift jib strut over center with assist crane. Use
extreme caution not to side load strut while lifting.
3. If required, raise jib point with an outside assist (another
crane or a fork-lift truck) to gain enough slack to allow
pinning backstay pendants.
4. Pin backstay links (1) to lugs on boom insert (View G).
Install Jib Stop
See Figure 4-38 for following procedure, unless otherwise
noted.
1. Remove connecting pin (View A) from boom top.
2. Remove storage pins (Figure 4-36, View D) and lower
jib stop assembly to boom top. Store storage pins in lugs
on jib stop frame (View B).
3. Align holes and pin jib stop frame to lugs on boom top
(View A).
Connecting pin must go through connecting holes in
rated capacity indicator/limiter sheave frames, if
equipped.
4. Adjust jib stop length as follows (View A).
a. Remove offset pins.
b. Adjust position of inner tubes so holes in tubes are
aligned with desired offset holes in links.
c. Reinstall offset pins.
5. Connect control cable.
a. If not already done, fasten cable sheave to end of
boom top as shown in View E.
b. Route cable extension from jib stop (View F)
through sheave in boom top (View E).
c. Using shackle provided, connect cable extension to
cable from winch (View D).
6. Using hand winch on jib top (View C), haul in control
cable enough to tension jib stop pins so that safety pins
can be removed.
7. Remove safety pins from jib stop pins (View E) and store
pins in lugs on jib stop frame (View B).
8. Pay out control cable until cable is loose. Cable should
be resting on bottom lacings in jib sections. Pins will not
engage if cable is not slack.
NOTE: The jib stop pins will engage automatically when
the jib is raised.
Finish Rigging Boom
Finish assembling the boom, as required. See Boom Rigging
Guide in this section for instructions.
Removing Jib
Lower Boom and Jib
1. Lower boom until jib point is approximately 1 ft (305 mm)
from contacting ground.
2. Using hand winch on jib top (Figure 4-38, View C) haul
in control cable until jib stop pins are fully disengaged.
Lock handle in position with pawl on winch.
Visually observe that jib stop pins are fully disengaged.
3. Lower boom onto blocking at ground level.
4. Install safety pins in hole in both jib stop pins
(Figure 4-36, View E).
5. Pay out control cable until cable is slack.
WARNING
Crushing Injury!
Jib stop pins are spring engaged. Do not remove safety
pins until jib stop assembly is pinned in working position;
and, control cables are attached and tensioned.
DANGER
Collapsing Jib Hazard!
To prevent death or serious injury, do not stand on, inside,
or under jib during disassembly. Always stand on outside
of jib when removing connecting pins.
Support jib properly before removing pins. Block sections
at connection points.
CAUTION
Jib Stop Damage!
Do not allow jib point to touch ground until jib stop pins are
disengaged.
WARNING
Crushing Injury Hazard!
Jib stop pins are spring engaged. Do not attempt to store
jib stop until jib stop pins are fully disengaged and safety
pins are installed.
To Next Page
Loading...
Need help?
General
