Kenworth K270, Body Builder'S Manual

Page: 57 / 96

6-4
Section 6
Frame
Modifications
WARNING!
Do not drill new holes any closer than 2 inches (50 mm) to existing holes. Frame drilling affects the
strength of the rails.
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.
Mount the suspension Brackets On the
Original Rail (see frame insert section &
figures 6-1 and 6-2.)
Extended Wheelbase
Do Not Mount the
Suspension Bracket
On the Added
Frame Rail
Original Wheelbase
Relocated Rear
Suspension
Shortened Wheelbase
Figure 6-3 Comparison of Original, Shortened, and Extended Wheelbases.
Crossmembers
Cut Frame at Rear to
Obtain Desired Cutoff
After changing a wheelbase, an additional crossmember may be required to maintain the original frame strength. The
maximum allowable distance between adjacent crossmembers is 60 inches (1524 mm). If the distance between adja-
cent crossmembers exceeds this dimension, add a crossmember between them. See Figure 6-4.
Less Than 60”
Before Wheelbase is Lengthened
Greater Than 60”
Additional Crossmember
Figure 6-4. Crossmember Added When Distance Exceeds 60 Inches (1524 mm)