Manitowoc National Crane NBT40 Series - Multi-Part Line Reeving; Using Multiple Part Lines

4-6 Published 4-23-2018 Control # 239-11
SET-UP NBT40 SERIES OPERATOR MANUAL
MULTI-PART LINE REEVING
Multipart line reeving enables greater loads to be lifted than
can be lifted with single part line. However, loads are limited
by the stability and structural integrity of the crane. The load
must be within the limits contained in the load chart.
Using Multiple Part Lines
The hoist data chart provides information for pull limitations
on the hoist with various multipart reevings. These ratings
are based on providing the proper operating safety factor on
the cable supplied with the machine. Therefore, any
replacement rope must meet the cable specification in of this
manual.
The NBT36 is rated to lift 72,000 lbs (36 ton) at a 7 ft radius
with all booms retracted with an seven part block
The NBT40 is rated to lift 80,000 lbs (40 ton) at a 7 ft radius
with all booms retracted with an eight part block
The NBT45 is rated to lift 90,000 lbs (45 ton) at a 7 ft radius
with all booms retracted with an eight part block.
All pulls shown in the following table are on the fourth layer.
The line pulls increase and the speed decreases on the third,
second, and first layers.
NOTE: Keep at least three wraps of loadline on the drum at
all times.
Do not deadhead hook block against boom tip
when extending the boom.
Refer to load charts for all layers and wire rope
capacities.
FIGURE 4-3
Main Hoist Cable
Stow Peg
Auxiliary Hoist
Cable Stow Peg
1 Part Line 2 Part Line 3 Part Line 4 Part Line 5 Part Line 6 Part Line 7 Part Line 8 Part Line
Maximum Pull
Normal Speed
11,250 Lbs
191 fpm
High Speed
5,000 Lbs
383 fpm
Maximum Pull
Normal Speed
22,500 Lbs
95 fpm
High Speed
10,000 Lbs
191 fpm
Maximum Pull
Normal Speed
33,750 Lbs
63 fpm
High Speed
15,000 Lbs
127 fpm
Maximum Pull
Normal Speed
45,000 Lbs
47 fpm
High Speed
20,000 Lbs
95 fpm
Maximum Pull
Normal Speed
56,250 Lbs
38 fpm
High Speed
25,000 Lbs
76 fpm
Maximum Pull
Normal Speed
67,500 Lbs
31 fpm
High Speed
30,000 Lbs
63 fpm
Maximum Pull
Normal Speed
78,750Lbs
27 fpm
High Speed
35,000 Lbs
54 fpm
Maximum Pull
Normal Speed
90,000Lbs
23 fpm
High Speed
40,000 Lbs
47 fpm
The hook block must be sized to the number of line parts. For example, do not use a six part line hook block on a three part line reeving. Contact
your National Crane Distributor or Manitowoc Crane Care to order the proper hook block.