DRIVE BELT TENSION
Prior to any maintenance, check drive belt and pulley for wear, cracks and fraying. Replace if necessary. Using a belt tension gauge, measure drive belt tension midway on longest belt run. See GENERATOR DRIVE BELT TENSION table. Adjust drive belt as necessary.
Scheme 5
| Application | Lbs. (N) | |
|---|---|---|
| New Belt | 86-104 (383-463) | |
| Used Belt | 68-86 (302-383) | |
GENERATOR DRIVE BELT TENSION
| Application | In. (mm) |
|---|---|
| New Belt | 0.31-0.35 (8-9) |
| Used Belt | 0.35-0.39 (9-10) |
GENERATOR DRIVE BELT DEFLECTION
BEARING
Check for abnormal noise, looseness and insufficient lubrication. Replace bearing(s) if necessary.
BRUSH
New brush length is .846" (21.5 mm). Minimum brush length is .315" (8.0 mm). If brushes are worn beyond limit, replace them.
BRUSH SPRING
Measure force of brush spring with a spring pressure gauge. See BRUSH SPRING SPECIFICATIONS .
| Application | Lbs. (N) |
|---|---|
| Standard Force | 0.71-0.93 (3.1-4.1) |
| Minimum | 0.36-0.52 (1.6-2.3) |
BRUSH SPRING SPECIFICATIONS
RECTIFIER
Using ohmmeter, check for continuity between each diode. See DIODE CONTINUITY table. (Scheme 6) If continuity is not as specified, replace rectifier.
| Negative Terminal | Positive Terminal | Continuity |
|---|---|---|
| E | PN, P1, P2 & P3 | No |
| B | PN, P1, P2 & P3 | Yes |
| T | PN, P1, P2 & P3 | Yes |
| PN, P1, P2 & P3 | E | Yes |
| PN, P1, P2 & P3 | B | No |
| PN, P2 & P3 | T | No |
| PN | T | Yes |
DIODE CONTINUITY
Scheme 6
ROTOR
Using ohmmeter, measure resistance between slip rings. If resistance is not 3.5-4.5 ohms, replace rotor. Check for continuity between slip ring and core. If continuity exists, replace rotor. If slip ring surface is rough, smooth with a lathe or fine sandpaper.
STATOR
Using ohmmeter, check continuity between stator coil leads. If continuity does not exist, replace stator. Check continuity between stator coil leads and core. If continuity exists, replace stator.