BODY MOUNTING
Peterbilt Motors Company 4-6
FRAME DRILLING
WARNING! 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 prematurely and cause an accident.
Mount the body using body mounting brackets or U–bolts.
FIGURE 4-8. Frame Rail Flange Drilling Prohibited
WARNING! DO NOT drill closely spaced holes in the frame rail. 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
two holes.
CAUTION: An appropriately sized bolt and nut must be installed and torqued properly in all unused frame holes.
Failure to do so could result in a frame crack initiation around the hole.
CAUTION: 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.
CAUTION: 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.
CAUTION: The hole diameter should not exceed the bolt diameter by more than .060 inches (1.5mm).
