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7.3.3.8. Check of contact rings

Check working surfaces of contact rings. On them there should not be agnails or chips.

Fig. 7.25. Measurement of diameter of contact rings


Measure by a caliper diameter of contact rings (fig. 7.25).
Standard diameter: 14,2–14,4 mm.
Minimum admissible: 12,8 mm.
If diameter of contact rings is less minimum admissible, the rotor needs to be replaced.