Volvo VNL 780 Operator's Manual page 94

84 INSTRUMENTS AND CONTROLS
Interwheel Differential Lock
When the lock is engaged, a telltale lights up in the instrument cluster.
Inter-Wheel Tell-Tale
A differential lock should only be used on a slippery surface, NOT when driving on good
road conditions. If a differential lock telltale is activated in the instrument cluster, do not
make turns until the telltale has gone out. Refer to INSERT HEAD REF for information on
how to properly engage and drive with differential locks engaged.
T4015831
T3014470