CRANE INSTALLATION NBT40 SERVICE MANUAL
9-2 Published 8-01-2017 Control # 287-11
The wheelbase, CT and chassis weights shown are
required so the basic NBT40 can be legally driven in all
states and meet stability requirements. The dimensions
given assume the sub-base is installed properly behind
the truck cab. If exhaust stacks, transmission
protrusions, etc. do not allow a close installation to the
cab, the WB and CT dimensions must be increased.
Refer to the Mounting Configuration pages for additional
information.
3. Axle Weight Limits. Individual states vary on the
permissible loads that a three axle or a four axle truck
may carry on state highways. Some states allow
25,000 pounds on the steering axle and 45,000 pounds
on a tandem axle if the unit is designated as a truck
mounted crane.
All states must use the Federal Bridge Law requirements
for trucks operating on the Interstate highway system.
Three axles (a tandem axle with a pusher or a tag axle)
must be spaced more than eight ft apart to carry
42,000 pounds. Four axles (a steering axle and tandem
axle with pusher or tag) must be spaced at least 23.5 ft
apart to carry 58,000 pounds of gross weight and 26.5 ft
to carry 60,000 pounds. These measurements are taken
between the extremes of the front and the rear axles.
4. Truck Frame. Try to select a truck frame that will
minimize or eliminate frame reinforcement or extension
of the after frame (AF). Many frames are available that
have the necessary after frame (AF) section modulus
(S.M.) and resistance to bending moment (RBM) so that
reinforcing is not required. The front hydraulic jack is
used for a 360° working range around the truck. The
frame under the cab through the front suspension must
have the minimum S.M. and RBM because reinforcing
through the front suspension is often difficult because of
engine, radiator mounts and steering mechanics. See
“Truck Requirements” and “Frame Strength” pages for
the necessary section modulus and resistance to
bending moment values.
5. Additional Equipment. In addition to the axle ratings,
wheelbase, cab-to-axle requirements and frame, it is
recommended that the truck is equipped with electronic
engine control, increased cooling and a transmission
with a PTO opening available with an extra heavy duty
PTO. See “PTO Selection” pages. A conventional cab
truck should be used for standard crane mounts.
6. Neutral Start Switch. The chassis must be equipped
with a switch that prevents operation of the engine
starter when the transmission is in gear.
7. Serial Number Identification - Figure 9-1 shows the
typical locations for the Serial Number identification tags
that are fastened to the main components of the crane.
Before proceeding with the installation, verify that the
number on the serial number plates on the major
components match the main serial number which is
found on the crane frame.
If the serial numbers do not match, contact the factory
before proceeding. Matching the serial number plates
insures that accurate warranty information will be
recorded at the factory and will aid in dispensing service
bulletins and other pertinent information.
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