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Construction Machinery: Self-Powered Scraper Caterpillar
| Model | Forward gears number | Reverse gears number |
|---|---|---|
| 657G | 8 | 1 |
| 657E | 8 | |
| 651E | 8 | |
| 637G | 8 | 1 |
| 637E | 7 | |
| 637D | 8 | |
| 631G | 8 | 1 |
| 631E | 7 | |
| 627G | 8 | 1 |
| 627E | 8 | 1 |
| 623G | 8 | 1 |
| 621S | 8 | |
| 621G | 8 | 1 |
| 621E | 8 | |
| 621B | 8 | |
| 615C serie II | 6 | |
| 613C serie II | 6 | 1 |