Generations
| Model | Size | Built around | Used market | Enclosed cab |
|---|---|---|---|---|
| Komatsu WA420-1 | 200-300 hp | 1994 | known | 98% |
| Komatsu WA420-3 | 200-300 hp | 1998 | known | — |
| Komatsu WA420 | 200-300 hp | 1998 | known | 93% |
| Komatsu WA4203MC | 200-300 hp | 2000 | rare | — |
| Komatsu WA420-3H | 200-300 hp | 2001 | rare | — |