Manitowoc 999 User Manual

Reference Only
Manitowoc Published 05-15-17, Control # 043-09 4-31
999 LUFFING JIB OPERATOR MANUAL SETUP AND INSTALLATION
4
Boom-Luffing Jib Rigging
The boom, luffing jib, and fixed jib components must be
assembled according to the instructions in this section and in
Luffing Jib Rigging Drawings.
Lifting Slings
Lifting slings are required to raise the jib with the assist
crane. Each lifting sling must have a minimum capacity of
16,000 pounds (7 257 kg).
Assist Crane
The assist crane must meet the capacity and boom length
requirements specified in Jib Luffing Assembly, Assemble-
In-Air Drawing.
Position the assist crane along either side of the boom and
luffing jib, as shown in Figure 4-15
:
1. Position assist crane boom at 70 – 80° boom angle.
2. Position assist crane on a firm, level, uniformly
supporting surface with its crawlers parallel to boom and
luffing jib.
3. Position assist crane upperworks facing in direction of
999 boom top.
4. Operate assist crane so that load line remains vertical at
all times. Assist crane must not put any side load on
boom and luffing jib.
FIGURE 4-15
A590
Luffing
Jib
Travel Assist Crane Forward when
Lowering Boom and Luffing Jib
Position Assist Crane Parallel
to Boom and Luffing Jib with
Operator’s Cab Facing in
Direction of Luffing Jib Top
Travel Assist Crane in Reverse when
Raising Boom and Luffing Jib
CAUTION
Structural Damage!
Keep load line from assist crane vertical during
raising and lowering procedures. Use extreme
care not to side load boom and luffing jib.
Assist Crane Boom at
70° – 80° Angle
WARNING
Tipping Crane Hazard!
Assist crane must meet requirements specified in Jib
Luffing Assembly, Assemble-In-Air Drawing. Using too
small an assist crane or positioning and operating assist
crane improperly will result in tipping. Boom and luffing jib
could collapse.

Manitowoc 999 Specifications

General

Brand	Manitowoc
Model	999
Category	Construction Equipment
Language	English