Generations
| Model | Size | Built around | Used market | Enclosed cab |
|---|---|---|---|---|
| Komatsu PC40-2 | 0-6 t | — | rare | — |
| Komatsu PC40-3 | 0-6 t | 1987 | rare | — |
| Komatsu PC40MRX | 0-6 t | 1990 | rare | — |
| Komatsu PC40-6 | 0-6 t | 1991 | common | 98% |
| Komatsu PC40 | 0-6 t | 1992 | common | 98% |
| Komatsu PC40-7E | 0-6 t | 1996 | rare | — |
| Komatsu PC40FR | 0-6 t | 1996 | rare | — |
| Komatsu PC40R | 0-6 t | 1997 | rare | — |
| Komatsu PC40R-8 | 0-6 t | 1998 | rare | — |
| Komatsu PC40MR-1 | 0-6 t | 2001 | known | — |
| Komatsu PC40MR | 0-6 t | 2002 | rare | — |
| Komatsu PC40MR-2 | 0-6 t | 2005 | rare | — |