2010 Kenworth T440/T470 Body Builder Manual

Section 7
Frame Modifications
WELDED
JOINT
24 Inch
Minimum
(610 mm)
FIGURE 7-2. Frame Insert
Where possible, use existing bolt holes to attach the insert to the frame. Bolt holes must not be located closer to the frame
fl anges than the present bolt pattern.
If the insert is placed in a section of the main frame where few bolts are located, additional bolts are required. Use the following
guideline for locating additional bolt holes.
CHANGING WHEELBASE
We do not recommend modifying the wheelbase. Occasionally, however, a chassis wheelbase will need to be reduced or
lengthened. When this needs to be done there are a few guidelines that should to be considered.
WARNING!
When changing the wheelbase, be sure to follow the driveline manufacturer’s recommendations
for driveline length or angle changes. Incorrectly modified drivelines may fail prematurely
due to excessive vibration. Failure to comply may result in personal injury, death,
equipment or property damage.
Before changing the wheelbase the driveline angles of the proposed wheelbase need to be examined to ensure that no
harmful vibrations are created. Consult the driveline manufacturer for appropriate recommendations.
WARNING!
When changing the wheelbase, a continuous blank frame insert/outsert must be added in
the area of the new rear suspension mounting bolts. All new mounting holes must pass
through the original rail and the insert/outsert. Failure to do so may cause excessive
stress in the original rail due to additional holes. Failure to comply may result in personal
injury, death, equipment or property damage.
Before the rear suspension is relocated, check the new location of the spring hanger brackets. The new holes for the
spring hanger brackets must not overlap existing holes and should not come any closer than 2 inches (50 mm) to existing
holes in the frame.
WARNING!
When relocating a suspension bracket, do not mount it on the extended (added) section
of a frame rail. The suspension loading may result in premature failure of the added section
splice. Use care when planning the wheelbase so that the rear suspension bracket is
always mounted on the original rail section. See Figure 7–3. Failure to comply may result
in personal injury, death, equipment or property damage.
7-3
12/09