Generations
| Model | Size | Built around | Used market | Enclosed cab |
|---|---|---|---|---|
| Case 621 | 100-150 hp | 1990 | common | 68% |
| Case 621ZF | 100-150 hp | 1991 | known | 71% |
| Case 621BXT | 100-150 hp | 1996 | known | — |
| Case 621B | 100-150 hp | 1996 | common | 62% |
| Case 621C | 100-150 hp | 1999 | common | 76% |
| Case 621CXR | 100-150 hp | 1999 | rare | — |
| Case 621CXT | 100-150 hp | 2000 | rare | — |
| Case 621D | 100-150 hp | 2004 | common | 73% |
| Case 621DXT | 100-150 hp | 2004 | known | — |
| Case 621DXR | 100-150 hp | 2008 | rare | — |
| Case 621E | 150-200 hp | 2009 | rare | — |