The mechanical clutch decoupler is used to disengage and engage the clutch.
It consists of release levers, an impression sleeve with a thrust bearing, opening forks, the lever system, shafts and rods and the clutch pedal. The pressure on the pedal is transferred to the thrust bearing ring by means of a linkage system, which presses on the longer arms of the release levers. Shorter lever arms, overcoming the resistance of the compression springs, they pull back the pressure plate and release the clutch plate. The clutch has been disengaged. When the pressure on the clutch pedal is removed, the pressure springs expand and use the pressure plate to press the clutch plate against the flywheel. To obtain the same movement of all three release levers, adjusting screws are located at the ends of the disengaging levers which ensure even distance of the pressure plate. The screwing in or out of the adjusting screws ensures the correct positioning of the shut-off levers, giving even and simultaneous pressure of the thrust ring on all three levers. With the clutch engaged (fully released pedal) there is play between the shut-off levers and the thrust bearing shut-off ring, which is 2,5-5 Mm. This clearance is needed in order to ensure that the pressure springs fully press down the clutch plates. At the same time, it protects against partial disengagement of the clutch during vibrations and shocks while driving and ensures breaks in the operation of the thrust bearing.. Due to the play, the bearing only works when the clutch is disengaged. Depending on the gear ratio in the lever system of the clutch disengagement mechanism, the clutch pedal must have the so-called. idle stroke, which is 25-50 Mm. Idle pedal travel (clutch pedal play) it is regulated by changing the active length of the pull rod of the fork disengaging the clutch.