9-2 Published 08/16/19 Control # 112-05
CRANE INSTALLATION 500E2 SERVICE MANUAL
vehicle laws relating to weights and dimensional restrictions
such as overall length, overhang, etc.
This section is organized by first presenting detailed
information relating to truck requirements and mounting
configurations followed by a step-by-step installation
procedure including PTO selection, Pump rotation selection,
reinforcement, crane and stabilizer installation,
counterweighting, boom rests and stability testing.
The final manufacturer of the vehicle must certify that the
axle ratings have not been exceeded with all permanently
attached equipment including a full load of fuel and men [at
200 lb (90 kg) each].
National Cranes need to meet ASME/ANSI B30.5 (latest)
when completed as cranes and ASME/ANSI B30.23 (latest)
when completed as a personnel lifting system. These
standards require welds to meet AWS D14.3 or AWS D1.1
respectively. Any work done in mounting must be done in
compliance with these codes.
NOTE: Before installation, verify that the serial number on
the plates located on the major components match
the main serial number on the crane frame. If the
serial numbers do not match, contact the factory
before proceeding. Matching the serial numbers
insure that accurate warranty information is
recorded at the factory and aids in dispensing
service bulletins and other pertinent information.
MINIMUM TRUCK REQUIREMENTS
Many factors must be considered in the selection of a proper
truck for a boom truck crane. Items which must be
considered are:
• 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.
• Wheelbase, Cab-to-Axle (CA) - The wheelbase and
CA required are in part determined by the mounting
configuration but also by the boom length and the
platform length of the particular unit. Match the platform
length to the retracted boom length so that the boom
doesn't overhang the rear of the bed by more than that
required by legal regulations where the unit will be
operated. The truck cab-to-axle dimension is then
determined by the length of the bed (the bed should be
approximately centered over the rear axle) and the
mounting space that the crane frame takes up between
the cab and the bed.
• 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 degree 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.
• 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.
• Neutral Start Switch - If the crane is equipped with
optional remote operator controls, the chassis must be
equipped with an engine anti-start switch that prevents
remote start-up operation of the engine starter when the
transmission is engaged in gear.
MOUNTING CONFIGURATIONS
The National Crane is a versatile machine and its versatility
can be enhanced by the manner in which it is mounted.
Following is a brief description of the mounting
configurations and the advantages of each. The minimum
weights listed below the front and rear axles for each
configuration are estimated minimum front and rear axle
weights for an 85% stability factor before the crane,
stabilizers and sub-base, if required, are installed on the
chassis. The minimum weights listed below the front and rear
axles for the New York City approved configurations are
estimated front and rear axle weights for 75% stability factor
before the crane stabilizers and sub-base are installed on the
chassis.
NOTE: These weights include the permanently attached
equipment on the chassis, such as pumps, PTO's,
reinforcing, chassis mounted options, bed and
counterweight.
Before placing this unit in service, a final stability check as
outlined in this section must be performed.
The maximum weights listed below the front and rear axles
for each configuration are estimated maximum front and rear
axle weights for not exceeding axle capacities before the
crane, stabilizers, and sub-base, if required, are installed on
the chassis.
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