Test/Inspect

MEASURE
TOOLS REQUIRED:
J 39200 Digital Multimeter
J 26900-5 Vernier Caliper

Measuring Rotor Slip Ring Resistance:

1. Resistance between the rotor slip rings using a J 39200. If resistance is greater than 3.5 ohms, replace the rotor.

Measuring Rotor Slip Ring To Rotor Resistance:

2. Resistance between the rotor slip ring and the rotor using the J 39200. If resistance is less than 5 ohms, replace the rotor.

Measuring Stator Lead Resistance:

3. Resistance between all stator leads using the J 39200. If resistance is greater than 5 ohms for any measurement, replace the stator.

Measuring Stator Lead-to-Stator Core Resistance:

4. Resistance between all stator leads and the stator core using the J 39200. If resistance is less than 5 ohms, replace the stator.

Measuring Brush Length:

5. Length of each brush using a J 26900-5. Standard brush length is 16 mm (0.63 inch). If the length is more than 2 mm (0.08 inch) from the standard length, replace the brush.

Measuring Rectifier Upper Body-to-Diode Lead Resistance:

6. Resistance between rectifier upper body and each diode lead using the J 39200. Reverse the probes and measure resistance again. If resistance is not less than 5 ohms in one measurement and greater than 5 ohms in the other measurement, replace the rectifier.

Measuring Rectifier Lower Body-to-Diode Lead Resistance:

7. Resistance between rectifier lower body and each diode lead using the J 39200. Reverse the probes and measure resistance again. If resistance is not less than 5 ohms in one measurement and greater than 5 ohms in the other measurement, replace the rectifier.

Rectifier Diode Trio Resistance:

8. Resistance between both leads of each rectifier diode trio using the J 39200. Reverse the probes and measure resistance again. If resistance is not less than 5 ohms in one measurement and greater than 5 ohms in the other measurement, replace the rectifier.

Measuring Condenser Capacity:

9. Condenser capacity using a digital capacitor meter. If condenser capacity is not 0.5 micro F, replace the rectifier.

INSPECT
^ Rotor slip rings for roughness or scoring. If slip rings are rough or scored, replace the rotor.