Manitowoc 999 User Manual

Reference Only
SETUP AND INSTALLATION 999 LUFFING JIB OPERATOR MANUAL
4-40
Published 05-15-17, Control # 043-09
Lowering Procedure
Two lowering procedures are provided:
• Procedure A – Lower Boom and Luffing Jib
• Procedure B – Lower Boom and Luffing Jib with Fixed
Jib
Lower Boom and Luffing Jib
Read and fully understand Jack-Knife Lowering Procedure in
this section before proceeding.
1. Perform Jack-Knife Lowering Procedure steps to lower
boom and luffing jib until jib point rollers contact ground.
Make sure boom and jib are over extended outrigger,
that BOOM ANGLE is 85°, and that boom to luffing jib
angle is at value given in Jib Luffing Assembly,
Assemble-In-Air Drawing.
2. Continue with lowering steps until BOOM ANGLE is at
or slightly above value given in Jib Luffing
Assembly, Assemble-In-Air Drawing.
3. Go to Remove Jib Top
procedure.
Lower Boom, Luffing Jib, and Fixed Jib
Read and fully understand Jack-Knife Lowering Procedure in
this section before proceeding.
1. Perform Jack-Knife Lowering Procedure steps in this
section to lower boom and luffing jib until fixed jib point
rollers contact ground.
Make sure boom and jib are over extended
outrigger, that BOOM ANGLE is 85°, and that BOOM
TO LUFFING JIB ANGLE is at value given Jib Luffing
Assembly, Assemble-In-Air Drawing.
2. Unpin fixed jib stop. See Lowering Boom and Jib
instructions in this section.
3. Continue with lowering steps in this section until luffing
jib point rollers contact ground.
4. Remove fixed jib.
5. Continue with lowering steps in this section until BOOM
ANGLE is at or slightly above value given in Jib
Luffing Assembly, Assemble-In-Air Drawing.
6. Go to Remove Jib Top
procedure.
Remove Jib Top
WARNING
Moving Part Hazard!
Warn all personnel to stand clear of rollers while lowering
boom and luffing jib.
Death or severe crushing injuries will occur if personnel
come into contact with rollers.
Falling Load Hazard!
Lower load blocks or weight balls to ground before
lowering jib past required operating radius.
Structural damage can occur or attachment can collapse.
CAUTION
Tipping Hazard!
To prevent tipping:
Do not lower boom and luffing jib to ground until outrigger
assembly is installed and jack pads are extended firmly
against foundation. Boom and jib must be lowered over
outrigger.
Structural Damage Hazard!
To prevent structural damage to crane or attachment:
• BOOM TO JIB ANGLE must be as specified in Jib
Luffing Assembly, Assemble-In-Air Drawing or jib
must hang vertical (whichever occurs first) before
boom and jib can be lowered. Structural damage can
cause attachment to collapse.
• Monitor angle on digital display as boom and jib are
lowered.
• Do not lower boom and luffing jib beyond BOOM
ANGLE given in Jib Luffing Assembly, Assemble-In-
Air Drawing until slings from assist crane are attached
to luffing jib. Structural damage can cause attachment
to collapse.
Monitor angle on digital display as boom and jib are
lowered.
Structural Damage Hazard!
Prevent side load damage to boom and jib. Disengage
swing lock and release swing brake when jib point rollers
are on ground.
CAUTION
Structural Damage!
Luffing jib to fixed jib angle must never be less than 95°.

Manitowoc 999 Specifications

General

Brand	Manitowoc
Model	999
Category	Construction Equipment
Language	English