Helwig Carbon Brushes Elevator Technician Field Guide


When it comes to carbon brushes, this is no “magic” brush grade and there is no substitute for good maintenance. You can maximize brush life and equipment performance by taking the appropriate steps, such as checking for proper spring tension, proper current density, proper maintenance of the commutator and that brushes are changed properly.

 Brushes of different designs or materials should not be mixed on the same unit. Brush life of 1-2 weeks or less is not a grade problem. Be sure to check that the brushes are not hanging up in the holder, neutral is set properly, the commutator is round within .002” and there are no high bars or mica, and spring pressure is 3.5-4.0 PSI.


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