Keck-Gonnerman Farm tractors by power
Keck-Gonnerman manufactured tractors, steam engines, and other farm machinery in Indiana. Growing out of a blacksmith shop, Keck-Gonnerman began manufacturing kerosene tractors in 1917. Several standard-tread tractor designs followed, but Keck-Gonnerman tractor designs did not keep up with the rapid changes of the 1920s and tractor production ended by 1937. Production of other equipment, including combines, continued until 1955.
| Model | Power | Years |
| 12-24 | 13 hp[B] | 1917 - 1918 |
| 15-30 | 16 hp[B] | 1920 - 1927 |
| 18-35 | 38 hp[B] | 1928 - 1937 |
| 25-50 | 55 hp[B] | 1928 - 1937 |
| 30-60 | 66 hp[B] | 1928 - 1937 |
[B]: Engine power estimated from belt horsepower. See individual tractor data listing for power details.