9-14 Published 08/16/19 Control # 112-05
CRANE INSTALLATION 500E2 SERVICE MANUAL
REQUIREMENTS FOR OPTIONAL SINGLE
FRONT OUTRIGGER
The truck frame must have adequate strength from under the
crane frame through the front suspension to the bumper
assembly for single front outrigger (SFO) installation. A truck
frame yield strength of 110,000 psi (758 MPa) is required.
The following diagram shows the required section modulus
at various stations along the front end of the truck frame for a
standard behind-the-cab mount with torsion box.
In order to safely mount a SFO in place of the normal front
bumper, a minimum bolt pattern as shown is required. The
bracket must be capable of supporting 0.50 inch (12.7 mm)
DIA. Grade 8 bolts to their nominal breaking strength. Torque
the mounting bolts supplied with the SFO to 110 ft-lb (149
N·m).
Do not use spacers between the bumper bracket and the
SFO bumper assembly.
If the bumper bracket and front of the truck frame do not
meet these specifications, an extended frame truck must be
used. Contact factory for details. Details for mounting an
SFO on an extended frame truck are included in that
installation instruction. However, the Section Modulus
requirements outlined below do apply.
Front
Axle
L
C
2.0 in
3
(33 cm
3
)
Front of
T-Box
7.5 in
3
(123 cm
3
)
11.0 in
3
(180 cm
3
)
15.9 in
3
(261 cm
3
)
Section Modulus per Truck
Frame Rail (Frame Rail Yield
Stress = 110,000 psi (785 MPa)
4.50 in (11.4 cm) Min
Bumper
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