Manitowoc 31000 User Manual

Reference Only
Manitowoc Published 07-23-15, Control # 078-03 4-77
31000 LUFFING JIB OPERATOR MANUAL SET-UP AND INSTALLATION
4
#91 LUFFING JIB DISASSEMBLY
Lower the Luffing Jib and Boom
Adjust or Remove the Luffing Jib
Lower the Jib Strut
Step Action
1
Lower the hook block and/or weight ball per the load chart for the luffing jib/boom length configuration.
2
Lower the luffing jib per the luffing jib raising/lowering procedure chart to a 70°, 90°, or 150° boom-to-luffing jib
included angle as specified by the chart.
3
With the luffing jib at the chart specified included angle, lower the boom towards the ground as the main hoist and
whip/auxiliary wire rope is payed out so as to not drag the blocks.
NOTE: If the luffing jib is equipped with an upper boom point, remove the locking pins (Figure 4-79
) and use
mechanical means to pivot the upper boom point away from the crane, the reversal of Figure 4-82
. The
upper boom point should end up positioned as shown in Figure 4-81
.
4
Lower the boom while positioning the jib top onto the dolly as shown in Figure 4-61.
5
Disconnect the main load hoist wire rope from the lower boom point and the whip line from the upper boom point.
6
If the optional upper boom point is installed, remove it (Figure 4-78).
7
With the jib top in the dolly, lower the boom until the boom-to-luffing jib included angle equals 150°.
8
Raise the jib stop to the erecting position (Figure 4-63).
9
Boom down as the dolly moves away from the crane. As soon as the jib backstay spreader hydraulic control
(Figure 4-44
) is reachable, use the Portable Power Unit to retract the jib backstay spreader (Figure 4-38) and to
pull the jib backstay straps towards the center line.
10
Open the bypass valves on both main strut support stops (Figure 4-39).
11
Continue to boom down as the dolly moves away from the crane. Support the boom on stands (Figure 4-2).
Position the jib strut to allow the jib straps to be disconnected and folded onto the appropriate inserts (Figure 4-57
and Figure 4-59
).
Step Action
12
With the luffing jib in the down position (Figure 4-55), the luffing jib length can be adjusted or the luffing jib can be
disassembled.
• If adjusting the luffing jib length, use proper care with the jib stop hydraulic lines that from the #91 luffing jib butt
reel.
• If disassembling the luffing jib, before unpinning the #91 luffing jib butt from the #90 boom top, return the
hydraulic lines to the #91 boom jib butt (Figure 4-56
) and disconnect the jib stop hydraulic lines from the #91
luffing jib butt hard piping (Figure 4-53
).
13
For luffing jib disassembly, pay in the main load hoist and whip wire ropes so that the rope ends in the #90 boom
top wire rope guide (Figure 4-7
). Move the Drum 2 wire rope behind the equalizer insert (Figure 4-3).
Step Action
14
With the luffing jib removed, pay out the luffing jib hoist line (Drum 5) and lower the jib strut onto the counterweight
box configuration shown in Figure 4-13
.

Manitowoc 31000 Specifications

General

Brand	Manitowoc
Model	31000
Category	Construction Equipment
Language	English