Manitowoc 999 User Manual

Reference Only
Manitowoc Published 05-15-17, Control # 043-09 4-29
999 LUFFING JIB OPERATOR MANUAL SETUP AND INSTALLATION
4
12. Pin wedge socket (10, Figure 4-7, View A) to strut
handling pendant and link (7).
13. Haul in front drum load line so load line and strut
handling pendant are just slightly slack.
Keep load line slacker than luffing hoist wire rope so
jib strut is not over tensioned.
14. Unpin lower stop tubes from lugs on boom top
(Figure 4-7
, View G). It may be necessary to luff up or
down to loosen pins.
15. Slowly pay out load line while hauling in luffing hoist wire
rope to raise main strut to vertical.
16. Stop raising main strut as it nears vertical and pin strut
stop tubes to main strut as shown in Figure 4-7
, View F.
17. Tighten load line as main strut nears vertical and
continue to haul in luffing hoist wire rope so strut moves
smoothly past vertical.
18. Continue to lower main strut to approximately 3 ft (1 m)
above jib strut.
19. Unpin strut supports (12, Figure 4-7
, View D) from
storage position on main strut and allow to hang
vertically. Slowly pay out load line to lower strut supports
to lugs on jib strut.
20. Pin strut supports to lugs on jib strut (Figure 4-7
, View
D).
21. Unpin strut handling pendant and link from wedge
socket and pin to left side main strut pendant for storage
(Figure 4-7
, View C).
22. Remove socket and wedge from front drum load line and
store. Spool wire rope onto front drum for storage.
23. Pin main strut pendants to main strut for storage
(Figure 4-7
, View C).
24. Unreeve and spool luffing hoist wire rope onto rear drum
for storage.
25. Store main strut:
a. Attach slings (5, Figure 4-4
, View A) from assist
crane to four lifting lugs (6) on main strut.
b. Slowly lift main strut until it is supported by assist
crane.
c. Unpin strut supports (14, Figure 4-4
, View A-A) from
rigging position and pin in storage position.
d. Remove pins (13) from connecting holes in end of
main strut.
e. Unpin strut supports (14, View A-A) from storage
position and pin in rigging position.
f. Slowly lower main strut onto jib strut for shipping
(Figure 4-3
, View B).
g. Remove slings (5).
h. Store pins (13) in main strut holes.
Removing Jib
Reverse Installing Jib steps in this section to disassemble
and remove jib.
Jib butt and both struts can be shipped as an assembled
unit. When handling this assembly, use lifting slings
attached to four lifting lugs on main strut (6, Figure 4-3
,
View D).
NOTE: Automatic boom stop must be reset to 83° for
operation without the luffing jib (see Automatic
Boom Stop Adjustment in Section 6).
CAUTION
Jib Strut Damage!
Do not allow luffing hoist wire rope to go into tension until
main strut is near vertical. Jib strut could be damaged.
WARNING
Collapsing Boom/Jib Hazard!
Improper disassembly of boom and jib sections can cause
boom or jib to collapse onto personnel removing
connecting pins.
Death or serious injury can result if precautions listed
below are not taken:
• Lower boom/jib so boom and jib points are supported
on blocking or ground.
• Slacken rigging — do not attempt to remove
connecting pins while boom or jib is supported by
rigging.
• Block below both ends of each boom or jib section
before removing connecting pins.
• Stand on outside of boom or jib sections when
removing connecting pins. Never work under or
inside boom or jib sections. Use care not to damage
lacings and chords as pins are knocked out.

Manitowoc 999 Specifications

General

Brand	Manitowoc
Model	999
Category	Construction Equipment
Language	English