Generations
| Model | Size | Built around | Used market | Enclosed cab |
|---|---|---|---|---|
| Komatsu PC138US-2 | 12-20 t | 2001 | rare | — |
| Komatsu PC138USLC2 | 12-20 t | 2004 | known | 100% |
| Komatsu PC138USLC | 12-20 t | 2005 | rare | — |
| Komatsu PC138US | 12-20 t | 2005 | rare | — |
| Komatsu PC138USLC2E0 | 12-20 t | 2005 | known | 100% |
| Komatsu PC138US-2E | 12-20 t | 2006 | rare | — |
| Komatsu PC138USLC8 | 12-20 t | 2008 | rare | — |