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Brush Test

  1. Connect ohmmeter lead to positive brush holder and other lead to negative brush holder. If continuity exists, brush holder assembly is shorted and must be replaced.
  2. Check brush length. Standard brush length is .67" (17.0 mm). Minimum brush length is .45" (11.5 mm). If length is less than specified, replace brushes.
  3. Using brush spring scale, measure spring tension. Tension should be greater than 2 lbs. (0.9 kg). Tension for a NEW spring should be 3.1-5.7 lbs. (1.4-2.6 kg). Ensure brushes move freely in holders.
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