Kramer GL-Reihe
6 models in this series
Kramer GL: the first tractors from Gutmadingen – single-cylinder engines with 6.6 to 13 kW (9 to 18 hp), 942 to 1,639 cm³ displacement, evaporative cooling
In 1925 the Kramer brothers began building small engines and tractors in Gutmadingen, Baden — the GL series is among the earliest models from these founding years, well before the company headquarters moved to Überlingen in 1952.
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The register lists 6 live models, from the GL 9 to the GL 18, built between 1933 and 1936. Output ranges from 6.6 to 13 kW, or 9 to 18 hp, weight from 1,100 to 1,300 kg, displacement from 942 to 1,639 cm3, all with single-cylinder engines.
With their single-cylinder hot-bulb or early diesel engines and modest output under 20 hp, the GL tractors targeted small farms switching from horse-drawn to engine-powered work for the first time.
As one of the oldest series in the register, the GL series marks the starting point of Kramer's tractor history, which continued until the company gave up tractor building in 1973 in favour of construction machinery.
The evaporative cooling noted in the register needed no pump or radiator: water heated in the engine evaporated in an open tank, carrying away heat, and had to be topped up regularly. With output under 20 hp, the GL models fell into the smallest three-point category 0 under ISO 730. As one of the oldest recorded designs, the GL series likewise has correspondingly limited parts availability. Restorations therefore often rely on home-made replacements for smaller wear parts.
Sources: SpecCodex register, model data: Kramer GL-Reihe
Models compared
6 of 6 models.
| GL 101935–1936 | GL 11/121936 | GL 141933–1936 | GL 161933–1936 | GL 181933–1936 | GL 91933–1935 | |
|---|---|---|---|---|---|---|
| Power | 6.6 kW | 8 kW | 10 kW | 12 kW | 13 kW | 6.6 kW |
| Rated speed | 1,500 rpm | 1,500 rpm | 1,500 rpm | 1,500 rpm | 1,500 rpm | 1,500 rpm |
| Cylinders | 1 | 1 | 1 | 1 | 1 | 1 |
| Displacement | 1,126 cm³ | 1,126 cm³ | 1,639 cm³ | 1,639 cm³ | 1,126 cm³ | 942 cm³ |
| Forward gears | 3 | 3 | 4 | 4 | – | 3 |
| Reverse gears | 1 | 1 | 1 | 1 | – | 1 |
| Top speed | 8 km/h | 8 km/h | 8 km/h | 8 km/h | 8 km/h | 8 km/h |
| Wheelbase | 1,700 mm | 1,700 mm | 1,800 mm | 1,800 mm | – | 1,700 mm |
| Length | 2,200 mm | 2,200 mm | 2,400 mm | 2,400 mm | 2,400 mm | 2,200 mm |
| Width | 1,300 mm | 1,300 mm | 1,300 mm | 1,300 mm | 1,300 mm | 1,300 mm |
| Height | 1,300 mm | 1,300 mm | 1,300 mm | 1,300 mm | 1,300 mm | 1,300 mm |
| Unladen weight | 1,100 kg | 1,100 kg | 1,300 kg | 1,300 kg | 1,300 kg | 1,100 kg |
Models
Tractor in 3D section
Turn the model, look inside and click an assembly — each one is explained.
GL 10
The GL-Reihe series from Kramer includes the GL 10. Production: 1935–1936. The engine delivers 9 hp (6.6 kW), has 1...
GL 11/12
The Kramer GL 11/12 belongs to the GL-Reihe series. Production: 1936. The engine delivers 11 hp (8 kW), has 1...
GL 14
The Kramer GL 14 is a model in the GL-Reihe series. Production: 1933–1936. The engine delivers 14 hp (10 kW), has 1...
GL 16
With the GL 16, Kramer offers a model from the GL-Reihe series. Production: 1933–1936. The engine delivers 16 hp (12...
GL 18
The GL 18 from Kramer is part of the GL-Reihe series. Production: 1933–1936. The engine delivers 18 hp (13 kW), has...
GL 9
The GL-Reihe series from Kramer includes the GL 9. Production: 1933–1935. The engine delivers 9 hp (6.6 kW), has 1...