Cummins 4B3.9-G12 vs John Deere 3029TFG89
The Cummins 4B3.9-G12 and John Deere 3029TFG89 are both diesel generator engines in a similar power class. Both are rated at roughly 38 kVA. Displacement is 3.9 L versus 2.9 L. The table below compares their full specifications side by side.
| Specification | Cummins 4B3.9-G12 | John Deere 3029TFG89 |
|---|---|---|
| Headline rating | 38 kVA | 38 kVA |
| Standby (50 Hz) | 30 kWe | — |
| Prime (50 Hz) | 25 kWe | — |
| Standby (60 Hz) | 35 kWe | 30 kWe |
| Prime (60 Hz) | 28 kWe | 29 kWe |
| Displacement | 3.9 L | 2.9 L |
| Configuration | L4 | L3 |
| Cylinders | 4 | 3 |
| Rated speed | 1,500 / 1,800 RPM | 1,800 RPM |
| Fuel | Diesel | Diesel |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | Unregulated | U.S. EPA Tier 3 |
| Dry weight | — | — |
| Origin | China | United States |