Paccar Kenworth T800 2012, Manual, Page: 213 / 276

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Section 7
Frame Modifications
FRAME MODIFICATIONS
Introduction
Kenworth offers customer specified wheelbases. So, in most cases frame modifications to produce a certain wheelbase
should not be necessary.
However, some installations may require slight modifications, while other installations will require extensive modifications.
Sometimes an existing dealer stock chassis may need to have the wheelbase changed to better fit a customer’s applica
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tion. The modifications may be as simple as shortening or lengthening the frame cutoff, or they may be as complex as
changing the wheelbase.
DRILLING RAILS
Location and Hole Pattern
If holes need to be drilled to attach anything to the rail, see SECTION 6 “BODY MOUNTING” for more information. Follow
the general spacing and hole location guidelines on Page 6–5, Figure 6–6.
When mounting a body to the chassis, DO NOT drill holes in the upper or lower flange of
the frame rail. If the frame rail flanges are modified or damaged, the rail could fail prema
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turely and cause an accident. Mount the body using body mounting brackets or U–bolts.
Do not drill closely spare holes in the web of the frame. Hole centers of two adjacent holes
should be spaced no less than twice the diameter of the largest hole. Closer spacing could
induce a failure between the holes.
An appropriately sized bolt and nut must be installed and torqued properly in all unused
frame holes. Failure to do so could result in frame crack initiation around the hole.
Use care when drilling the frame web so the wires and air lines routed inside the rail are
not damaged, Failure to do so could cause an inoperable electrical or air system circuit.
Never use a torch to make holes in the rail. Use the appropriate diameter drill bit. Heat from
a torch will affect the material properties of the frame rail and could result in frame rail
cracks.
Hole diameter should not exceed the bolt diameter by more than .060 inches (1.5 mm).
Oversized holes could result in excessive frame wear around the hole.
WARNING!
CAUTION:
WARNING!
CAUTION:
CAUTION:
CAUTION: