Brush and brush holder

1. Verify that there is no conductivity between each insulated brush and plate using a tester.

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   • If there is conductivity, replace the brush holder.
2. Measure the brush length.

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   • If any brush is worn almost to or beyond the minimum specification, replace all of the brushes.

   Starter brush length 

   Standard: 12.3 mm {0.484 in}

   Minimum: 5.5 mm {0.22 in}

3. Measure the brush spring force using a spring balance.

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• If not within the minimum specification, replace the brush and brush holder component.

Starter brush spring force 

Standard: 15.0-20.4 N {1.53-2.08 kgf, 3.38-4.58 lbf}

Minimum: 2.75 N {0.280 kgf, 0.618 lbf}