Manitowoc National Crane NBT40 Series, Service Manual

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CRANE INSTALLATION NBT40 SERVICE MANUAL
9-10
Published 8-01-2017 Control # 287-11
Configuration With Tag Axle 94,000 GVWR, 103 ft Boom – NBT45TM
Mounting configuration ( with tag axle 94,000 lb GVWR, 103 ft
boom) shown in Figure 9-6 is based on a 85% stability factor.
Complete unit must be installed on 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.
Mounting and truck requirements:
• Working area 360° (240° without SFO)
• Gross Axle Weight Rating (GAWR), front 36,000 lb
• Gross Axle Weight Rating (GAWR), rear 58,000 lb
• Gross Vehicle Weight Rating 94,000 lb
• Wheelbase (WB) 310 in
• Frame Section Modulus (SM), front axle to end of AF 30 in
3
• After Frame (AF) 88 in (min)
• Minimum truck weight required for stability
- 32,000 lb gross
- 19,000 lb front axle
- 13,000 rear axle
- Less Weight required if equipped with auxiliary
hoist or additional swinging counterweight.
- Additional options or heavier bare chassis
weights will require additional axles or a GVWR
in excess of 94,000 lb; in some states special
permits for overload are required.
• Estimated Final Weight with following machine
configuration:
NBT45TM (Wet) - 70,000 lb
- 103 ft Boom, 400 lb 3 part block
- 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 9-6 shows the 360° working area that can be
achieved with front stabilizer (optional on Series NBT45TM;
240° stable without SFO). The front stabilizer is essential
when extending the boom and lifting loads over front of 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.
90 MIN
136 MIN
108 MIN
233 MIN
88 MIN
315 MIN WB
279 MIN
APPROX.
C
L
ROTATION
Optional Front Stabilizer
for 360 degree Capacity
Working Area
FIGURE 9-6
7708
Reference Only