National Crane Published 10-30-2014 Control # 040-09 7-3
1400H OPERATOR AND SERVICE MANUAL INSTALLATION
MINIMUM TRUCK REQUIREMENTS
Many factors must be considered in the selection of a
proper truck for a 1400H series crane. Items which must be
considered are:
1. Axle Rating. Axle ratings are determined by the axles,
tires, rims, springs, brakes, steering and frame strength
of the truck. If any one of these components is below the
required rating, the gross axle rating is reduced to its
weakest component value.
2. Wheelbase (WB), Cab-to-Trunnion (CT) and Bare
Chassis Weight. The wheelbase, CT and chassis
weights shown are required so the basic 1400H 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. 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 optional front stabilizer
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.
4. 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.
5. Neutral Start Switch. The chassis must be equipped
with a switch that prevents operation of the engine
starter when the transmission is in gear.
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