Manitowoc 999 User Manual

Reference Only
Manitowoc Published 05-15-17, Control # 043-09 4-53
999 LUFFING JIB OPERATOR MANUAL SETUP AND INSTALLATION
4
Lowering Boom and Jib
NOTE: Circled numbers in Figure 4-27 correspond to
numbered steps in the following procedure.
Monitor angles on digital display in operator’s cab while
lowering boom and jibs.
1. Swing upperworks in-line with lowerworks so boom is
over desired end of crawlers.
2. Travel crawler rollers onto blocking (end under boom).
3. Swing boom and jib slightly to either side of center and
lower weight ball or load block onto ground. Then swing
boom and jib in-line with crawlers.
4. Raise boom to a minimum angle of 80°.
5. Position jib at required boom to luffing jib angle (see
Luffing Jib Raising Procedure Chart for angle).
6. Slowly lower boom until fixed jib roller just lightly
contacts ground.
7. Unpin fixed jib stop. A personnel hoist will be required for
the following steps:
a. Haul in jib stop control cable with hand winch on jib
top until both jib stop pins are fully disengaged and
install both safety pins (Figure 4-24
, View B).
b. Pay out control cable until it is resting on bottom of
jib sections.
c. Remove pins (4, Figure 4-25
, View F).
8. If desired, load block or weight ball can be removed from
fixed jib point at this time. Prior to removal, securely
fasten load line to end of jib point before removing load
block or weight ball.
9. Continue to lower boom slowly — do not lower luffing
jib — until luffing jib rollers contact ground.
Fixed jib roller will roll along ground as boom is lowered.
10. Store jib stop, as follows (see Figure 4-25
):
a. Support outer tube (2) with slings from assist crane.
b. Support links (5) by hand and remove pins (1).
c. Rotate links (5) to stored position and install pins (4,
Figure 4-25
, View C).
d. Support inner tubes (7, Figure 4-25
, View F) and
remove pins (6).
e. Slide inner tubes down to first hole in links (8) and
install pins (6, Figure 4-25
, View C).
f. Rotate jib stop to stored position on jib strut
(Figure 4-25
, View C) and install pins (3).
WARNING
Moving Part Hazard!
Warn all personnel to stand clear of jib point roller while
lowering boom and jib.
Death or severe crushing injuries will occur if personnel
come into contact with roller.
WARNING
Tipping Crane Hazard!
Lower all boom and jib combinations over blocked
crawlers. Otherwise crane will tip.
WARNING
Tipping Crane Hazard!
Lower all weight balls or load blocks onto ground before
lowering boom and jib. Crane could tip if this step is not
performed.
WARNING
Tipping Crane Hazard!
Do not lower boom and jibs to ground until boom has
been positioned at minimum angle of 80° and luffing jib
has been positioned at specified boom to luffing jib angle.
Crane will tip.
CAUTION
Tipping Crane Hazard!
Do not lower boom any further until jib stop pins are fully
disengaged and pins (4, Figure 4-25
, View F) are
removed. Damage to jib stop, jib strut, or luffing jib top will
occur.
WARNING
Falling Wire Rope Hazard!
For long boom and short luffing jib combinations, load line
on boom side of attachment can overhaul load line on
luffing jib side of attachment. Load line could fall off boom
if load line is not secured to jib point.

Manitowoc 999 Specifications

General

Brand	Manitowoc
Model	999
Category	Construction Equipment
Language	English