Manitowoc Published 05-15-17, Control # 043-09 4-5
999 LUFFING JIB OPERATOR MANUAL SETUP AND INSTALLATION
LUFFING JIB RIGGING GUIDE - #149 JIB
Installing Jib
Lower Boom
1. Travel front crawler rollers onto blocking. All boom and
jib combinations must be raised over front or rear of
blocked crawlers.
2. Swing upper slightly to either side and lower load block
and weight ball onto ground.
3. Swing boom in-line with crawlers and lower boom onto
blocking placed under connectors between boom top
and insert next to boom top. Size height of blocking so
distance between boom point sheaves and ground is
approximately 26 in (0,7 m) (Figure 4-3
, View B).
Prepare Crane for Jib
1. Disconnect load lines from weight ball and/or load block.
Rear drum is required for luffing hoist. Front drum is
required for raising main strut and for load line to
luffing jib.
2. Remove fixed jib, if equipped.
3. Change boom length as necessary to meet job
requirements.
Make sure boom top and all boom sections have
been properly modified for use with luffing jib.
Contact the Manitowoc Crane Care Lattice Team for
details.
4. Check that all boom inserts and boom straps are
assembled in the proper sequence according to rigging
drawing.
5. To reduce boom weight, remove upper wire rope guide
assembly from boom top (Figure 4-3
, View B).
6. If necessary to reduce boom weight, remove sheave
clusters from lower boom point and replace them with
spacers (if applicable). See Luffing Jib Raising
Procedure for boom length limitations with sheave
clusters installed. See Lower Boom Point Installation
instructions in Crane Operator Manual for procedure.
7. Install auxiliary drum, if required (see Auxiliary Drum
Installation instructions in Crane Operator Manual).
8. Add or remove crane counterweight to comply with
applicable Capacity Chart.
9. Determine luffing hoist wire rope requirements. If
desired, remove the load line from the rear drum and
install the desired luffing hoist wire rope specified on
Luffing Jib Rigging Drawing.
10. Install guide roller (1, Figure 4-3
, View A) on boom top.
Install Jib Stop Strut Assembly
See Figure 4-3, View B for the following procedures.
1. If jib stop strut assembly is already assembled to boom
top, proceed as follows:
a. Support strut assembly so it cannot fall.
b. Remove storage pins (3).
c. Lower strut assembly to ground.
d. Store pins (3) in lugs on upper strut.
2. If jib stop strut assembly is not assembled to boom top,
proceed as follows:
a. Using a forklift, lift strut assembly into position under
boom top. Storage pins (3) in lugs on upper strut
must face boom butt.
b. Align connecting holes and pin strut assembly to
boom top.
c. Lower strut assembly to ground.
Install Jib Butt Assembly
See Figure 4-3 for the following procedure.
1. Attach lifting slings (5) from assist crane to four lifting
lugs (6, View D) on jib strut (pass slings through opening
in main strut).
2. Remove pins (7, View E), keeper plates (8), and shims
(9) from holes in jib butt.
3. Lift jib butt assembly (butt and both struts) into position
at end of boom top and align connecting holes in jib butt
with holes in boom top.
4. Install pins (7, View E) and keeper plates (8).
As pins are installed, install shims (9, View C) on
outboard side of both boom top lugs so jib butt is
centered on boom top.
The shims have handles to make assembly easier.
5. Lower boom butt onto blocking approximately 6 in. (152
mm) high.
Install Jib Stop Pendants
See Figure 4-3, View D for the following procedure.
1. Pin jib stop pendants (10) to lugs on underside of boom
top.
2. Pin jib stop pendants (12) to lugs on underside of jib butt.
NOTE: Jib stop pendants will be connected to jib stop
lower strut when jib is raised later in this guide.
WARNING
Tipping Crane Hazard!
Do not attempt to raise more boom than specified when
lower boom point sheave clusters are installed. Rear of
crane will tip forward.
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