Description Of The Aptc Clutch Assembly - Ducati Monster 696 2009 Manual

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N 6.1

Description of the APTC clutch assembly

The APTC system with servo-assisted torque and anti-wheel slip on braking.
The advantages of this system are:
- prevents the unwelcome effects of excessive engine braking during hard downshifting, thus making for smoother, cleaner
cornering (no rear wheel slip);
- reduces the amount of driver effort required to disengage the clutch. The clutch lever effort is significantly reduced, without
compromising the feel of the lever to the rider (servo-assisted).
The APTC system consists essentially of a splined coupling between the two parts of the clutch drum.
This coupling exploits the axial component of driving torque (bike accelerating) or reverse-acting torque (clutch disengaged)
to produce servo-assistance in the former case and prevent rear wheel slip in the latter.
In practice, this means that under acceleration (and thus with driving torque) the clutch pack will tend to be under a greater load
(from springs initially more loaded), while during hard downshifting, the reverse-acting torque will tend to take load off the springs
thus causing the plates to slip.
Before working on the internal clutch parts, check that the clutch operates correctly. Then deal with the problem in a systematic
manner.
The following is a list of possible causes of clutch malfunctions.
A clutch which does not disengage may be caused by:
- excessive play of the control lever;
- distorted clutch plates;
- incorrect spring tension;
- faulty clutch release mechanism;
- excessive wear of the hub or clutch housing.
A clutch which slips may be caused by:
- insufficient play of the control lever;
- worn clutch plates;
- weakened springs;
- faulty clutch release mechanism;
- excessive wear of the hub or clutch drum.
A noisy clutch may be caused by:
- excessive backlash between the primary drive gears;
- damaged primary drive gear teeth;
- excessive play between driving plate tabs and clutch drum;
- worn gear/clutch drum bearings;
- the presence of metal particles (filings) on the gear teeth.
Monster 696/696+ - M.Y. 2009 - edition 00
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