- the condition and degree of wear of the brushes, their free movement in the grooves of the brush holders;
- contact of the brushes with the collector and the pressure of the springs on the brushes;
- collector appearance. The collector can only be cleaned with a clean rag soaked in gasoline or trichlorethylene. Grind the collector only with fine-grained sandpaper. It is forbidden to use sandpaper for this;
- the state of the most called bushings covers. When replacing bushings, put new bushings into boiling engine oil for 5 minutes before installation;
- appearance of the armature and stator. Make sure that their windings do not have breaks and signs of burning;
- when assembling, install a new retaining ring.
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