BELT TENSION
Measure deflection with 22 Lbs. (98 N) of force applied between generator and crankshaft pulley belt run. (Scheme 26) If deflection is not within specification, adjust belt. See BELT DEFLECTION table.
| Application | In. (mm) |
|---|---|
| New | .276-.354 (7-9) |
| Used | .354-.433 (9-11) |
BELT DEFLECTION
Scheme 26
BRUSH
- Measure the length of each brush. (Scheme 27) If wear exceeds the service limit, replace the brush. Each has the service limit mark (A) on it. See table under GENERATOR SPECIFICATIONS.
- Checking brush for proper pressure using a spring pressure indicator, push the brush into the brush holder until its tip protrudes.08" (2 mm). (Scheme 28) Then measure the pressure of brush spring. See «BRUSH SPECIFICATIONS»(ref-167575-S01977977702004101900000) table under GENERATOR SPECIFICATIONS.
Scheme 27
Scheme 28
DIODE
| CAUTION | Never use a mega tester (measuring use for high voltage) or any other similar measure for this test; otherwise, the diodes may be damaged. |
- Check for continuity between the diode lead and positive side heat sink. (Scheme 29) The positive diode is in good condition if resistance is 1 ohms or less only in the direction from the diode lead to heat sink.
- Check for continuity between the negative side heat sink and diode lead. (Scheme 30) The negative diode is in good condition if resistance is 1 ohms or less only in the direction from the heat sink to diode lead.
Scheme 29
Scheme 30
ROTOR
- Inspect the slip rings for contamination or any roughness of the sliding surface. Repair the slip ring surface using a lathe or sand paper.
- Measure the slip ring outer diameter. See «ROTOR ASSEMBLY SPECIFICATIONS»(ref-167575-S18756080282004101800000) table under GENERATOR SPECIFICATIONS. If the slip ring is worn replace rotor assembly.
- Check the resistance between slip rings using circuit tester. (Scheme 31)
- Check the continuity between slip ring and rotor core or shaft. (Scheme 32) If resistance is 1 ohm or less, the rotor coil is grounded, and so replace the rotor assembly.
- Check the rear ball bearing. Replace if it is noisy or if the rotor does not turn smoothly.
Scheme 31
Scheme 32
STATOR
- Inspect the stator coil for continuity between each end of the lead wires. (Scheme 33) If resistance is 1 ohms or more, the lead wire is broken, and so replace the stator assembly.
- Inspect the stator coil for continuity between stator core and each end of lead wire. (Scheme 34) If resistance is 1 ohm or less, the stator coil is grounded, and so replace the stator assembly.
