Check whether the springs of the receiving disk are still in good condition, and also whether the wedge gears are not excessively beaten.
Since oily clutch linings cannot be cleaned, in such conditions it is necessary to replace the clutch disc with a new one.
Check the clutch linings for reusability by measuring the distance from the lining to the countersunk head of the rivet with a thickness gauge. If this dimension is less than 0.3 mm, then the disc must be replaced with. new. The disk is also replaced with a new one if this size is soon reached.
To check the driven discs for runout, they are clamped with a suitable mandrel or shaft between the conical clamps1 of the lathe. The dial measuring device is mounted with a suitable support so that the index finger rests on the edge of this disc, namely on the outer edge of the disc. The dial slowly turns and the dial indicator is read. If the readings are greater than 0.4 mm, then you can, if desired, carefully align with forceps. In opposite cases, the disk can hardly be replaced with a new one.
The sliding matching of the driven disk bushing along the bevel gears of the clutch shaft is checked. To do this, a disc is mounted and grabbed on the outer edge between the protrusions and the index finger. The disc scrolls slightly to one side and the other. If the gap is more than 0.4 mm, then the bevel gear has wear. The reason for this can be found most likely in the slave drive.
Check the inner ends of the Belleville spring for wear. If deep grooves are visible, the clutch should be completely replaced. All points of the Belleville spring must be at the same height within 0.5 mm. Curved tips can be recurved. A special tool is usually used for this, but it is also possible to prepare a slotted steel plate and bend the ends with it.
Check the clutch pressure plate for wear in the places indicated by the arrows.
Check the inner ends of the Belleville spring for wear. If at the points shown in Fig. the places of workings are visible, then the clutch should be replaced completely.
Check the flat surface of the clutch pressure plate for distortion. The thickness gauge is inserted at the indicated places.
The measuring ruler is applied to the friction surface of the pressure plate, and the gap is measured with a thickness gauge. If the internal gap is more than 0.3 mm, then the clutch must be replaced completely.
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