Manitowoc National Crane NBT40 Series, Service Manual

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CRANE INSTALLATION NBT40 SERVICE MANUAL
9-8
Published 8-01-2017 Control # 287-11
Configuration With Tag Axle 60,000 lb GVWR, 142 FT Boom – NBT40 and NBT45
Mounting configuration (with Tag Axle 60,000 lb GVWR, 142
FT Boom shown in Figure 9-5 is based on 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 follows:
• Working area 360°
• Gross Axle Weight Rating (GAWR), front 20,000 lb
• Gross Axle Weight Rating (GAWR), rear 40,000 lb
• Gross Vehicle Weight Rating 60,000 lb
• Gross Tag Axle Rating 10,000 lb (min)
• Wheelbase (WB)258 in
• Tag Axle Location from Front Axle 331 in (min. for
60,500 lb GVWR on bridge law)
• Frame Section Modulus (SM), front axle to end of AF 30 in
3
• After Frame (AF) 101 in (min)
• Minimum Truck and Tag Weight Required for Stability
(truck with tag axle raised).
- 20,250 lb gross weight
- 9,975 lb front axle
- 10,275 lb rear axle
• Estimated Final Weight with the following machine
configuration:
NBT40 - 60,250 lb and NBT 45 - 63,750 lb
- 142 ft Boom, 400 lb 3 part block,
- Steel Decks
- 100 gal fuel
- two persons in cab.
- Add - 785 lb for 26 ft jib, 1105 lb for aux. hoist with
rooster sheave and 180 lb downhaul weight.
- 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 60,000 lb; in some states special
permits for overload are required.
Diagrams above show 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.
360° Full Capacity Working Area
FRONT
STABILIZER
101 MIN
28 MIN
97 MIN
(FOR 42,000 GAWRR
ON BRIDGE LAW)
168 MIN
258 WB
298 APPROX.
C
L
ROTATION
331 MIN
(FOR 60,500 GVWR
ON BRIDGE LAW
TAG
FIGURE 9-5
Reference Only