Ducati Diavel Workshop Manual page 83

Maintenance operations
Adjusting the chain tension
Make the rear wheel turn until you find the position where chain is tightest. Set the vehicle on the side stand. Push down
the chain at the point of measurement and release. Measure the distance between the "aperture" upper profile and pin
centre.
The read distance must be: 9 to 11 mm.
Important
If the drive chain is too tight or too slack, adjust it so that tension reading will fall within specified range.
To adjust the tension remove the rear splash guard (Sect. 7 - 13,
Slacken off the two clamp screws (1) that secure the rear wheel hub to the swingarm.
Fit the hook spanner code 88713.1038 inserting its tooth in the eccentric hub (2).
Rotate the eccentric hub (2) to obtain the correct chain tension.
Turn counter clockwise to tighten the chain; clockwise to loosen (from chain side).
Important
An incorrectly tensioned chain will lead to accelerated wear of the transmission components.
If the screws (1) are removed, lubricate with specified grease underhead and thread, then tighten the screws (1) to the
torque of 35 Nm ± 5% (Sect. 3 - 3,
Warning
The correct tightening of the fixing screws of the eccentric hub is essential for the safety of the rider and the passenger
(Sect. 3 - 3, Frame torque
Refit the rear splash guard (Sect. 7 - 13,
Frame torque settings) proceeding with sequence 1-2-1.
settings).
Refitting the
Removal of the
swingarm).
swingarm).