Ducati DIAVEL Owner's Manual page 171

The knob (3, Fig. 123), located on the expansion
reservoir of the shock absorber, adjusts the damping
during the compression phase. Turn the adjusters (1)
with a screwdriver or the knobs (2) and (3) clockwise
to obtain a harder setting or increase preload. Turn
them counter-clockwise to obtain the opposite
setting.
STANDARD setting: from the fully closed position
(clockwise), loosen as follows:
- rebound: open adjuster (1) by 12 clicks from fully
closed position;
- preload: knob (2) FULLY OPEN;
- compression: open knob (3) by 25 clicks from
fully closed position.
When carrying full load, set the rear shock absorber
spring to maximum preload to improve motorcycle
handling and keep safe clearance from the ground.
Note
When carrying full load, set the rear shock
absorber spring to maximum preload to improve
motorcycle handling and keep safe clearance from
the ground.
170
Warning
The shock absorber is filled with gas under
pressure and may cause severe damage if taken apart
by unskilled persons.
3
Fig. 123