| 27-SI Alternators | ||
|---|---|---|
| Part Number | Nominal Voltage | Nominal Current |
| 9L-5938 Alternator Gp | 12 V | 58 A |
| 3T-7070 Alternator Gp | 12 V | 58 A |
| 9W-1082 Alternator Gp | 12V | 83 A |
| Specifications for 27-SI Alternators (1) | |||
|---|---|---|---|
| CAT Part Number | 9L5938 | 3T7070 | 9W1082 |
| Torque of Pulley Nut (4) | 100 ± 7 N·m (75 ± 5 lb ft) | 100 ± 7 N·m (75 ± 5 lb ft) | 100 ± 7 N·m (75 ± 5 lb ft) |
| Torque of Four Through Bolts (3) | 6.2 ± 0.6 N·m (5.5 ± 5 lb in) | 6.2 ± 0.6 N·m (5.5 ± 5 lb in) | 6.2 ± 0.6 N·m (5.5 ± 5 lb in) |
| Torque of “B+” Terminal (Nut) (1) | 7.1 ± 0.9 N·m (63 ± 8.0 lb in) | 7.1 ± 0.9 N·m (63 ± 8.0 lb in) | 7.1 ± 0.9 N·m (63 ± 8.0 lb in) |
| Torque of “B-” Terminal (Bolt) (2) | 2.3 ± 0.6 N·m (20 ± 5 lb in) | 2.3 ± 0.6 N·m (20 ± 5 lb in) | 2.3 ± 0.6 N·m (20 ± 5 lb in) |
| Voltage Rating | 12 V | 12 V | 12 V |
| Rated Output Current | 58 A | 58 A | 83 A |
| Polarity | Negative Ground | Negative Ground | Negative Ground |
| Rotation | CW or CCW | CW or CCW | CW |
| Test Speed | 5000 rpm | 5000 rpm | 7000 rpm |
| Rated Output Current at the Test Speed | 37.0 A | 47.8 A | 61.1 A |
| Output Voltage at 25 °C (77 °F) |
27.4 ± 0.6 V | 27.4 ± 0.6 V | 14.0 ± 0.3 V |
| Resistance of Rotor Field Winding at 27 °C (81 °F) |
2.4 to 2.7 ê | 2.4 to 2.7 ê | 2.2 to 2.7 ê |
| Current of Rotor Field Winding at the Voltage Rating and 27 °C (81 °F) |
3.3 to 3.8 A | 2.5 to 2.8 A | 5.7 to 7.1 A |
| Turn-On Speed at 25 °C (77 °F) |
2000 rpm | 2000 rpm | 2000 rpm |
| ( 1 ) | Refer to Illustration 1. |