Component Inspection
ROTOR CHECKRotor:
1. Check the continuity between the slip rings of the field coil. It the resistance value is not within the standard value, replace the rotor.
Standard value: approximately 2 - 5 ohms
Rotor:
2. Check the continuity between the slip ring and the core. If there is continuity, replace the rotor.
STATOR CHECK
Stator:
1. Check the continuity between the coil lead. If there is no continuity, replace the stator
Stator:
2. Check the continuity between the coil and the core. If there is continuity, replace the stator.
RECTIFIER CHECK
1. A positive rectifier test checks the continuity between the positive rectifier and the stator coil lead connection terminal with a tester. If there is continuity at both terminals, the diode is shorted, so replace the rectifier.
2. A negative rectifier test checks the continuity between the negative rectifier and the stator coil lead connection terminal with a tester. If there is continuity in both terminals, the diode is grounded, so replace the rectifier.
3. A diode trio test checks the continuity of the three diodes by connecting an ohmmeter to both ends of each diode. If there is continuity in both directions, or it there is no continuity, the diode is damaged, so replace the rectifier.
BRUSH CHECK
1. Replace the brush if the brush protrusion length shown in the illustration is below the limit value.
Minimum limit: 2 mm (0.08 inch)
Brush Replacement:
2. The brush can be removed by unsoldering the brush lead wire.
3. When installing a new brush, push the brush in the brush holder as shown in the illustration, and solder the lead wire.