Cummins QSL9G4 vs John Deere 6090CG550
The Cummins QSL9G4 and John Deere 6090CG550 are both diesel generator engines in a similar power class. Both are rated at roughly 301 kVA. Displacement is 8.8 L versus 9 L. The table below compares their full specifications side by side.
| Specification | Cummins QSL9G4 | John Deere 6090CG550 |
|---|---|---|
| Headline rating | 300 kVA | 301 kVA |
| Standby (50 Hz) | 240 kWe | 241 kWe |
| Prime (50 Hz) | 220 kWe | 218 kWe |
| Standby (60 Hz) | 275 kWe | 241 kWe |
| Prime (60 Hz) | 250 kWe | 218 kWe |
| Displacement | 8.8 L | 9 L |
| Configuration | L6 | L6 |
| Cylinders | 6 | 6 |
| Rated speed | 1,500 / 1,800 RPM | 1,500 / 1,800 RPM |
| Fuel | Diesel | Diesel |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | U.S. EPA Tier 3 / EU Stage IIIA / China III | Euro Stage V / U.S. EPA Final Tier 4 |
| Dry weight | — | — |
| Origin | United States / United Kingdom | United States |
Choosing between Cummins QSL9G4 and John Deere 6090CG550
Use this comparison as an engineering shortlist, then confirm the complete generator package against load profile, voltage, 50/60 Hz frequency, duty class, emissions rules, cooling margin, altitude, ambient temperature, enclosure design, controller features, and alternator sizing. The John Deere 6090CG550 has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.