Alternator
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| Bosch Alternator Coverage Chart | |||
| Caterpillar Part Number | Model Number | Nominal Voltage (V) | Nominal Current (A) |
| 8C-5535 Charging Alternator Gp | K1 | 12 | 32 |
| 7T-2876 Charging Alternator Gp | K1 | 12 | 55 |
| 3E-7295 Charging Alternator Gp | K1 | 12 | 55 |
| 9X-0341 Charging Alternator Gp | K1 | 12 | 90 |
| 9W-3043 Charging Alternator Gp | N1 | 24 | 52 |
| 2Y-4212 Charging Alternator Gp | K1 | 24 | 17 |
| 2Y-8310 Charging Alternator Gp | K1 | 24 | 21 |
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| Illustration 1 | g03224641 |
Alternators Sectional View (1) Pulley Nut (2) Through Bolt (3) Slip Ring (4) Brush | |
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| Illustration 2 | g03224642 |
Alternators End View | |
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| Illustration 3 | g03224643 |
Alternators Enclosed End View | |
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| Illustration 4 | g03224644 |
Alternators Enclosed End View (1) Pulley Nut (2) Through Bolt | |
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| Illustration 5 | g03224645 |
Alternator End View | |
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| ALTERNATOR SPECIFICATION | |||||||
| Cat Part Number | 8C-5535 | 7T-2876 | 9W-3043 | 2Y-4212 | 2Y-8310 | 3E-7295 | 9X-0341 |
| Model Number | K1 | K1 | N1 | K1 | K1 | K1 | K1 |
| Voltage Rating | 12V | 12V | 24V | 24V | 24V | 12V | 12V |
| Polarity | Neg. Grd. | Neg. Grd. | Neg. Grd. | Neg. Grd. | Neg. Grd. | Neg. Grd. | Neg. Grd. |
| Rotation | CW | CW | CW | CW | CW | CW | CW |
| Test Speed | 5000 rpm | 5000 rpm | 5000 rpm | 5000 rpm | 5000 rpm | 5000 rpm | 5000 rpm |
| Rated Output (Cold) | 29A | 55A | 52A | 17A | 21A | 55A | 90A |
| Output Voltage | 14.0 ± 0.5V | 14.0 ± 0.5V | 27.5 ± 1.0V | 27.5 ± 1.0V | 27.5 ± 1.0V | 14.0 ± 0.5V | 14.0 ± 0.5V |
| Rotor Field Winding Resistance | 3.4 to 3.7 Ω | 3.4 to 3.7 Ω | 9.0 to 9.9 Ω | 18 to 22 Ω | 14.4 to 17.6 Ω | 2.47 to 2.75Ω | 2.47 to 2.75Ω |
| Field Current (@ 28.0V to 14.0V) | 3.8 to 4.1A | 3.8 to 4.1A | 2.8 to 3.1A | 1.3 to 1.5A | 0.8 to 0.9A | 5.1 to 5.7A | 5.1 to 5.7A |
| Stator Winding Resistance | 0.14 to 0.15Ω | 0.14 to 0.15Ω | 0.20 to 0.22Ω | 0.41 to 0.51Ω | 0.34 to 0.42Ω | 0.14 to 0.15Ω | 0.55 to 0.56Ω |
| Turn On Speed (Max.) | 2000 rpm | 2000 rpm | 2000 rpm | 2000 rpm | 2000 rpm | 2000 rpm | 2000 rpm |
| Slip Rings (3) : Maximum Runout (TIR) | 0.03 mm (0.001 inch) | 0.03 mm (0.001 inch) |
0.03 mm (0.001 inch) |
0.03 mm (0.001 inch) |
0.03 mm (0.001 inch) |
0.03 mm (0.001 inch) |
0.03 mm (0.001 inch) |
| Minimum Diameter | 27.0 mm (1.06 inch) |
27.0 mm (1.06 inch) |
27.0 mm (1.06 inch) |
31.5 mm (1.24 inch) |
27.0 mm (1.06 inch) |
27.0 mm (1.06 inch) |
27.0 mm (1.06 inch) |
| Brush (4) Length: New | 17.0 mm (0.67 inch) |
17.0 mm (0.67 inch) |
17.0 mm (0.67 inch) |
10.0 mm (0.39 inch) |
13.0 mm (0.51 inch) |
17.0 mm (0.67 inch) |
17.0 mm (0.67 inch) |
| Brush (4) Length: Minimum | 11.5 mm (0.45 inch) |
11.5 mm (0.45 inch) |
11.5 mm (0.45 inch) |
8.0 mm (0.31 inch) |
8.0 mm (0.31 inch) |
11.5 mm (0.45 inch) |
11.5 mm (0.45 inch) |
| Brush Spring Force | 2.0 to 3.8 N (0.45 to 0.86 lb) |
2.0 to 3.8 N (0.45 to 0.86 lb) |
2.0 to 3.8 N (0.45 to 0.86 lb) |
2.0 to 3.8 N (0.45 to 0.86 lb) |
2.0 to 3.8 N (0.45 to 0.86 lb) |
2.0 to 3.8 N (0.45 to 0.86 lb) |
2.0 to 3.8 N (0.45 to 0.86 lb) |
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| ALTERNATOR TIGHTENING SPECIFICATION | ||||
| Cat Part Number | 8C-5535 2Y-4212 |
7T-2876 2Y-8310 |
9W-3043 | 3E-7295 9X-0341 |
| Pulley Nut (1) Torque | 35 ± 10 N·m (26 ± 7 lb ft) |
35 ± 10 N·m (26 ± 7 lb ft) |
50 ± 5 N·m (37 ± 4 lb ft) |
70 ± 5 N·m (52 ± 4 lb ft) |
| Through Bolts (2) Torque | 4.1 to 5.5 N·m (36 to 49 lb in) |
4.1 to 5.5 N·m (36 to 49 lb in) |
4.1 to 5.5 N·m (36 to 49 lb in) |
4.1 to 5.5 N·m (36 to 49 lb in) |
| Terminal Torques: B+ |
3.6 ± 0.8 N·m (32 ± 7 lb in) |
3.6 ± 0.8 N·m (32 ± 7 lb in) |
7.8 ± 0.8 N·m (69 ± 7 lb in) |
7.75 ± 0.25 N·m (69 ± 2.2 lb in) |
| B- | - | 2.25 ± 0.25 N·m (20 ± 2.2 lb in) |
3.6 ± 0.8 N·m (32 ± 7 lb in) |
3.25 ± 0.55 N·m (28.8 ± 4.9 lb in) |
| D+ | 2.25 ± 0.25 N·m (20 ± 2.2 lb in) |
1.70 ± 0.25 N·m (15.1 ± 2.2 lb in) |
1.70 ± 0.25 N·m (15.1 ± 2.2 lb in) |
3.25 ± 0.55 N·m (28.8 ± 4.9 lb in) |
| D- | 2.25 ± 0.25 N·m (20 ± 2.2 lb in) |
- | - | - |
| DF | 2.25 ± 0.25 N·m (20 ± 2.2 lb in) |
- | - | - |
| W | - | 2.25 ± 0.25 N·m (20 ± 2.2 lb in) |
2.25 ± 0.25 N·m (20 ± 2.2 lb in) |
6.35 ± 0.8 N·m (56.2 ± 7 lb in) |
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