If this operation is forgotten, the brushes will jump and sparks will be generated. In severe cases, the brushes will be burned and the generator will not operate normally.
When overhauling the generator, if the brush compression spring in the generator is forgotten to be installed, the slip ring brush will catch fire, the rotor current will be unstable , and even the stator voltage and current are unstable.
When overhauling the generator, you should check whether the cable connection is loose or burned, repair the cable or replace the burned cable, check whether the generator winding is short circuited or damaged. open circuit, and if then, repair the winding or replace the generator. Check if the generator rotor is overheated, damaged or unbalanced. If this is the case, the rotor parts need to be replaced or repaired.