The Cummins/Onan QSK78 engine line groups 5 variant designations. Parts and fitment are pooled here so a cross-reference found on one variant surfaces for the whole family.
| Part # | Description | Category |
|---|---|---|
| 0140-3963 | Filter, Air - Standard Duty | Air filter |
| A034R952 | Filter, Air - Heavy Duty | Air filter |
| A034R957 | Element, Primary - Heavy Duty | Air filter |
| A034R963 | Secondary, Primary - Heavy Duty | Air filter |
| 908-0600 | Cummins QSK78 Series Engine Operation and Maintenance Manual | Service part / kit |
| A041X654 | Element, Replacement - Crankcase Breather | Service part / kit |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.