General Information 7 Modifications to Vehicle Chassis Frame Frame side rails are heat treated. No weld- ing is permitted because structural failure may result. Do not drill through either top or bottom flanges. A warning label is also attached to the frame for information. Drilling is permitted in the frame web in accordance with a specified hole spacing pattern. Consult a Volvo Truck dealer to obtain approved hole spacing dimensions or refer to the Frame Rail and Cross Member Service Manual. W7000519 WARNING Frame rail and cross member nuts and bolts should be checked periodically and tight- ened to the specified torque if necessary.
Do not weld on any part of the frame or drill holes in the top or bottom flanges. Serious structural damage could occur. Frame Alterations Under no circumstances can the frame be cut and an extension piece added to in- crease the wheelbase. The only alteration allowed is wheel base shortening, where the only change in the frame rail is a new hole pattern drilled for the new location of the rear suspension. Welding In Vehicle Do not weld anywhere in or on the vehicle before disconnecting batteries, all electronic control units (ECU) and instrument cluster. See page 298 for more information. Do not use oxy/acetylene welding to repair cab panels.
Refer to the service manuals for specific information.