Manitowoc 999 User Manual

Reference Only
Manitowoc Published 05-15-17, Control # 043-09 4-23
999 LUFFING JIB OPERATOR MANUAL SETUP AND INSTALLATION
4
Jack-Knife Raising Procedure
See Figure 4-12 for the following procedure. Circled
numbers in Figure 4-12
correspond to numbered steps in the
following procedure.
NOTE: It is normal for the following limits to come on
during the raising procedure:
BLOCK UP — this fault will go off once the boom
and luffing jib are raised and the load lines/block-up
limit chains are hanging freely.
MAX UP 1 and MAX UP 2 — these faults will go off
once the boom to jib angle is less than 168°.
1. Perform Preliminary Raising Procedure.
2. Disengage swing lock and release swing brake.
3. Slowly boom up.
Jib point rollers will roll along ground as boom and jib are
jack-knifed into position.
4. Pay out load lines as boom and jib are raised.
5. Backstay pendants and jib straps will tighten as boom
and jib rise:
• OPERATOR — watch backstay pendants along left
side of boom. While booming up, pay out luffing
hoist wire rope (luff down) at a rate of speed that
allows backstay pendant connectors nearest you to
float up and down 6 – 12 in (152 – 305 mm) above
boom chord.
• SIGNAL PERSON — watch jib straps along left side
of jib. Straps should remain slack and lay on jib top
as boom and jib rise. If straps rise out of brackets on
jib top, signal operator to luff down faster.
It will be necessary to use limit bypass switch to luff
down if BLOCK UP limit is on.
6. Slowly continue with Jack-Knife Raising Procedure
steps 3
– 5.
7. Stop raising boom when boom and jib have been
positioned at required boom to jib angle or jib is vertical,
whichever occurs first. Monitor this angle on digital
display.
8. Slowly luff up until jib straps start to go into tension and
stop.
9. Boom up to raise jib point rollers clear of ground, apply
swing brake, and install load blocks or weight balls at jib
points (see Load Block Reeving in this section).
WARNING
Tipping Hazard!
Determine BOOM TO JIB ANGLE that boom and jib must
be jack-knifed to before jib can be raised (see Luffing Jib
Raising Procedure). Crane will tip or structural damage
will result if specified angle is not adhered to.
Monitor angle on digital display as boom and jib are
raised.
CAUTION
Structural Damage!
Avoid possible structural damage to boom and jib from
side loading as boom and jib are raised:
Disengage swing lock and release swing brake until boom
and jib have been raised to required boom to jib angle.
WARNING
Tipping Hazard!
Do not allow backstay pendants and jib straps to become
too tight during raising steps. Crane will tip or structural
damage will result.
Do not allow backstay pendants and jib straps to become
too slack during raising steps. Jib strut could fall onto jib
butt.
DANGER
Falling Jib Hazard!
Do not position boom and jib any boom to jib angle less
than minimum stop (40°). Structural damage to jib butt will
occur, possibly causing jib to collapse.

Manitowoc 999 Specifications

General

Brand	Manitowoc
Model	999
Category	Construction Equipment
Language	English