The vacuum cleaner or pure fabric clear a coupling casing of dust. Do not use compressed air as inhalation of the dust containing asbestos is unhealthy.

Check a condition of a surface of friction of a flywheel for lack of cracks, a prigar and wear of a surface.

Check a condition of frictional overlays of the conducted clutch plate and in the presence traces of oil or mechanical damages replace the conducted disk with them.

Fig. 3.35. Measurement of frictional overlays of the conducted clutch plate

Check thickness of overlays of the conducted clutch plate by means of a caliper with the nonius. Slips have to act over heads of rivets not less than on 0,3 mm (fig. 3.35).

If thickness of slips is less admissible or heads of rivets are close to a working surface, replace them or the conducted clutch plate. Check that springs were not broken and on them there were no cracks. Check for lack of wear of a vent in a clutch plate nave.

Fig. 3.36. Installation of the conducted clutch plate on a transmission shaft

Establish a clutch plate on a shaft of the transmission (fig. 3.36).

The conducted clutch plate has to slide easily and smoothly on vents of a main shaft of the transmission.

ATTENTION If replacement of the conducted clutch plate is made, it is necessary to replace also the bearing of switching off of coupling.

Using the indicator of hour type, check a clutch plate beating.

Minimum beating: 0.8 mm.

Fig. 3.37. Measurement of depth and width of wear of petals of a diaphragm spring

Using штангельциркуль with the nonius, check depth and width of wear of petals of a diaphragm spring (fig. 3.37).

At most:

And (depth): 0,5 mm;

B (width): 6,0 mm.

NOTE Insignificant damages of a surface of friction can be removed with a fine-grained emery paper, but in case of any doubts concerning a condition of a press disk it needs to be replaced new.

Fig. 3.38. Measurement of a beating of a flywheel

Using the indicator of hour type, check a beating of a flywheel (fig. 3.38).

Maximum beating: 0,1 mm.

Fig. 3.39. Check of the bearing of switching off of coupling

Rotate the bearing of switching off of coupling by a hand, putting effort in the axial direction, check the bearing of switching off of coupling (fig. 3.39).

NOTE In the bearing lubricant is put, thus, the additional lubricant calculated for all term of operation is not required. In case of need, replace the coupling switching off bearing.