Volvo VNL 780 Operator's Manual page 381

Clutch
General
DANGER
Before starting the engine, set the parking
brakes and place the transmission in
neutral. Failure to do so can result in
unexpected vehicle movement and can
cause serious personal injury and death.
DO NOT allow the clutch to slip excessively. This would cause excessive heat to be
generated and the clutch will be damaged and bring on premature failure. As soon as the
vehicle is moving, remove the foot from the pedal for complete clutch engagement. Once
the clutch is fully engaged, heat and wear does not affect it.
DO NOT shock load the drive line through rapid engagement of the clutch. Extreme care
should be taken when driving heavy loads up hills. Always use the lowest gear when starting
out under adverse conditions.
When operating a vehicle equipped with a clutch brake, the clutch pedal should not be
depressed more than halfway to the floor while shifting, except when the vehicle is at a stop.
To re-enter the low gear from neutral or reverse, or to enter reverse gear from neutral or low,
the clutch should be depressed all the way to engage the clutch brake. This stops the rotation
of the transmission input shaft and provides an easy, quiet gear engagement.
OPERATION 371