General description of clutch

The clutch when shifting gears disconnects the power circuit between the engine and the gearbox, and during acceleration it provides, using friction, a smooth, jerk-free, kinematic connection.

The clutch consists of a pressure (leading) disc, driven disc, release bearing and hydraulic drive with clutch pedal (see illustration 1.0).

The pressure plate is rigidly screwed to the flywheel, which, in turn, is flanged to the engine crankshaft.

Between the pressure plate and the flywheel is the clutch disc, which is pressed against the flywheel by the pressure plate.

The clutch disc is firmly connected to the input shaft of the gearbox with a splined hub.

When you press the clutch pedal (clutch disengagement) hydraulic pressure is applied to the clutch release fork and the clutch release bearing is pressed against the diaphragm of the pressure plate.

As a result of this, the pressure plate is released, and the clutch disc is no longer pressed against the flywheel.

The power circuit between the engine and gearbox stops (see illustrations 1.0a, 1.0b, 1.0c).

When not pressed, the pressure spring presses the bearing against the pressure plate.

This reduces the wear of the release bearing, because when it is turned on, it does not accelerate to engine speed.

Each time the clutch is engaged and disengaged, the friction lining of the clutch disc gradually wears out as a result of friction.

Thus, the clutch disc is a wear part, but it lasts an average of more than 100,000 kilometers.


The degree of wear depends mainly on the load (trailer operation) and driving style.

The clutch itself does not require maintenance, because. it is self-regulating.

The hydraulic clutch system is powered by brake fluid and is supplied from a common brake fluid reservoir.