Brush Spring

1. Measure the force of the brush spring using a spring pressure gauge.
2. Read the spring pressure gauge at the brush tip projection of 2 mm {0.079 in}. 

• Replace the brush spring if necessary.

Generator brush spring force 

Standard: 4.8-6.0 N {0.49-0.61 kg, 1.08-1.34 lb} 

Minimum: 2.16 N {0.22 kg, 0.49 lb} 

Fig 1: Measuring Force Of Brush Spring Using Spring Pressure Gauge

Courtesy of ABLE BODY CORP.