- 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 condition of the self-lubricating lid bushings. When replacing bushings, before installing new bushings, immerse them in engine oil according to SAE 30/40 for 20 minutes;
- appearance of the armature and stator. Make sure that their windings do not have breaks and signs of burning.
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