Manitowoc National Crane 800D - Truck Frame Requirements for Optional Front Stabilizer

INSTALLATION 800D
9-12
Published 5-27-2018 Control # 039-06
Truck Frame Requirements For Optional Front
Stabilizer
The truck frame must have adequate strength from under the
crane frame through the front suspension to the bumper
assembly for front stabilizer 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 front stabilizer in place of the
normal front bumper, a minimum bolt pattern as shown is
required. The bracket must be capable of supporting 0.50 in
(12.7 mm) DIA. Grade 8 bolts to their nominal breaking
strength. Torque the mounting bolts supplied with the front
stabilizer to 110 lb-ft (149 Nm). Do not use spacers
between the bumper bracket and the front stabilizer
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 a stabilizer on an extended frame truck are
included in that installation instruction. However, the Section
Modulus requirements outlined below do apply.
BUMPER MOUNT
ASSEMBLY
FRONT
AXLE
REAR OF
FRONT SPRING
HANGER
FRONT OF
T-BOX
20.0 in
3
(327 cm
3
)
11.0 in
3
(180 cm
3
)
7.5 in
3
(123 cm
3
)
2.0 in
3
(33 cm
3
)
SECTION MODULUS
PER TRUCK FRAME
RAIL [FRAME RAIL
YIELD STRESS =
110,000 PSI
(758 MPa)]
BUMPER
4.50 in (114 mm) MINIMUM
9439
Fo
r
Reference
Only