Manitowoc National Crane NBT40 Series - Configuration with 103;127 Ft Boom - NBT36

9
National Crane Published 8-01-2017 Control # 287-11 9-11
NBT40 SERVICE MANUAL CRANE INSTALLATION
Configuration With 103/127 ft Boom – NBT36
Mounting configuration (with 103/127 ft boom) shown in
Figure 9-7 is based on a 85% stability factor.
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.
Summary of mounting and truck requirements are as follows:
• Working area 360°
• Gross Axle Weight Rating (GAWR), front 20,000 lb
• Gross Axle Weight Rating (GAWR), rear 34,000 lb
• Gross Vehicle Weight Rating 54,000 lb
• Wheelbase (WB) 258 in
• Cab to Axle/Trunnion (CT)
• After Frame (AF) 92 in (min)
• Frame Section Modulus (SM), front axle to end of
afterframe:
- 110,000 psi (759 MPa) 30-in
3
(492-cm
3
)
• Estimated bare chassis weight required for stability prior
to installation of crane or accessories:
- Front 9,700 lb to 10,000 lb
- Rear 8,500 lb to 8,800 lb
- Required to mount basic crane with 31 ft jib.
Additional options or heavier bare chassis
weights will require additional axles or a GVWR
in excess of 54,000 lb. In some states special
permits for overload are required.
• Estimated Final Average Weight
- 51,880 lb
- Includes basic crane without jib, 100 gallon fuel
tank and two workers in cab.
Figure 9-4 shows the 360° working area that can be
achieved with the front stabilizer (standard on the NBT36).
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.
360° Full Capacity Working Area
FRONT
STABILIZER
92 MIN
28 MIN
180 MIN
258 MIN
20 MIN (24 TYP)
FIGURE 9-7
Reference Only