Manitowoc National Crane NBT40 Series, Service Manual

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CRANE INSTALLATION NBT40 SERVICE MANUAL
9-6
Published 8-01-2017 Control # 287-11
• Estimated Final Weight with the following machine
configuration.
NBT40 (Wet) - 57,500 lb and NBT 45 (Wet) - 61,000 lb
- 127 ft Boom, 400 lb 3 part block
- Steel Decks
- 100 gal fuel and two men in cab
- Add - 1590 lb for 31/55 ft jib, 1105 lb for aux.
hoist with rooster sheave and 180 lb downhaul
weight.
Figure 9-4 shows the 360° working area that can be
achieved with the front stabilizer (standard on the Series
NBT40). The front stabilizer is essential when extending the
boom and lifting loads over the front of the truck. See “Truck
Frame Strength” section for truck frame strength required for
mounting crane and front stabilizer.
Gross Vehicle Weight Rating (GVWR) is dependent on all
components of the vehicle (axles, tires, springs, frame, etc.)
meeting manufacturers' recommendations; always specify
GVWR when purchasing trucks.
Diesel engines require a variable speed governor and
energize-to-run fuel solenoid for smooth crane operation;
electronic fuel injection is required.
All mounting data is based on a National Series NBT40 with
subbase and an 85 percent stability factor.
The complete unit must be installed in accordance with
factory requirements, and a test performed to determine
actual stability and counterweight requirements; contact the
factory for details.
Transmission neutral safety interlock switch is required.
Configuration With Extended T-Box – NBT40-127 and NBT45-127
Mounting configuration ( with pusher axle 58,000 lb GVWR,
103/127 ft boom) shown in Figure 9-4 is based on an 85%
stability factor.
The complete unit must be installed on the truck in
accordance with factory requirements, and a test performed
to determine actual stability and counterweight
requirements, since individual truck chassis vary.
NOTE: If bare truck weights are not met, counterweight will
be required.
A summary of mounting and truck requirements are listed as
follows:
• Working area 360°
• Gross Axle Weight Rating (GAWR), front 20,000 lb
• Gross Axle Weight Rating (GAWR), rear 52,000 lb
• Gross Vehicle Weight Rating 65,000 lb
• Gross Pusher Axle Rating 13,000 lb (min)
• Wheelbase (WB) 285 in
• Pusher Axle Location from Front Axle 204 in (Typ.))
• Frame Section Modulus (SM), front axle to end of (AF)
27.5 in
3
• After Frame (AF) 92 in (min)
360° Full Capacity Working Area
FIGURE 9-4
PUSHER
81.0
124.8
312.0
360°
5.0
47.0
309.0 C
L
208.2
8738
Reference Only