Don't forget about time difference!
Very important remark: The CAT equipment prefix (first three figures and numbers in serial number) is absolutely necessary information for correct engine identification. But your additional information (full serial number, arrangement number, where the engine is installed etc.) will help to avoid mistakes and save our and your time. Sometimes the full serial number is absolutely essential information also (modification is inside the prefix).
| ID | Model | Description |
| 1825000 | CATERPILLAR WHEEL SKIDDER | |
| 1825010 | 2HD | 508 WHEEL SKIDDER 2HD |
| 1825011 | 9NC | 508 WHEEL SKIDDER 9NC |
| 1825012 | 4LR | 515 WHEEL SKIDDER 4LR |
| 1825013 | 50S | 518 WHEEL SKIDDER 50S |
| 1825014 | 55U | 518 WHEEL SKIDDER 55U |
| 1825015 | 94U | 518 WHEEL SKIDDER 94U |
| 1825016 | 95U | 518 WHEEL SKIDDER 95U |
| 1825017 | 1CL | 518C WHEEL SKIDDER 1CL |
| 1825018 | 9HJ | 518C WHEEL SKIDDER 9HJ |
| 1825019 | 1DN | 525 WHEEL SKIDDER 1DN |
| 1825020 | 3KZ | 525B WHEEL SKIDDER 3KZ |
| 1825021 | 525 | 525C WHEEL SKIDDER 525 |
| 1825022 | 51S | 528 WHEEL SKIDDER 51S |
| 1825023 | 78W | 528 WHEEL SKIDDER 78W |
| 1825024 | 96C | 528 WHEEL SKIDDER 96C |
| 1825025 | 97C | 528 WHEEL SKIDDER 97C |
| 1825026 | 8SJ | 528B WHEEL SKIDDER 8SJ |
| 1825027 | 5BK | 530B WHEEL SKIDDER 5BK |
| 1825028 | AAE | 535B WHEEL SKIDDER AAE |
| 1825029 | 535 | 535C WHEEL SKIDDER 535 |
| 1825030 | MCT | 535C WHEEL SKIDDER MCT |
| 1825031 | 2FZ | 545 WHEEL SKIDDER 2FZ |
| 1825032 | 545 | 545C WHEEL SKIDDER 545 |