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Testing & Repairing: Rotor

  1. Test claw pole rotor for short circuits to ground. Test voltage should be 40V AC. Measure resistance of exciter (field coil) in rotor with ohmmeter. See SPECIFICATIONS for proper value.  Turn down slip rings on a lathe, using suitable tailstock chuck (EFAW 75 or GDF 85 R 3).
  2. After turning, check concentricity of slip rings with dial gauge. Runout should not exceed 0.001" (0.03 mm). Minimum diameter of slip rings may be 1.25" (31.5 mm). Maximum runout of pole wheel must not exceed 0.002" (0.05 mm).
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