Volvo VNL 780 Operator's Manual page 444

434 MAINTENANCE AND LUBRICATION
Frame rail and cross member nuts and bolts should be checked periodically and tightened to
the specified torque if necessary.
Frame Alterations
Under no circumstances can the frame be cut and an extension piece added to increase 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
CAUTION
Use only electric welders due to the
coating on material used to build cabs.
Oxygen and Acetylene welding will not
bond properly due to coating.
Do not weld anywhere in or on the vehicle before disconnecting batteries, all electronic
control units (ECUs) and instrument cluster.
DO NOT use oxy/acetylene welding to repair cab panels.