Frame and Fifth Wheel Preventive Maintenance
– 218 – Y53-6008
Medium Duty (R10/06)
FRAME AND FIFTH WHEEL
Introduction
WARNING! Do not cut or splice frame rails or
drill through the top or bottom flanges. These
operations could affect frame rail strength lead-
ing to a failure resulting in serious personal
injury and/or an accident. Always leave frame
repairs to your Peterbilt Dealer.
Engine Painting
• Do not electrostatically paint electronically controlled
engines or vehicles with these engines.
Welding
• Observe these recommended procedures to protect
electronic systems during welding operations.
Engines
Before welding on vehicles equipped with electronic engines,
the following precautions should be observed:
NOTE: Welding to frame rail may void frame rail war-
ranty.
• Disconnect all electronic connections to the vehicle bat-
teries.
• Remove battery power cable and insulate it from the
vehicle.
• Disconnect all Electronic Control Module (ECM) connec-
tors (on electronic engines).
• Do not use the ECM or engine ground stud for the
ground of the welding probe.
• Ensure that the ground connection for the welder is as
close to the weld point as possible. This ensures maxi-
mum weld current and minimum risk to damage of elec-
trical components on the vehicle.
• Turn engine OFF.
All Anti–Lock Braking Systems (ABS)
• Before welding anywhere on the vehicle, detach the ABS
Electronic Control Unit (ECU) connector and all other
electronic control units.
