Porsche Super S 308
The Porsche Super S 308 is a tractor from Porsche-Diesel Motorenbau GmbH , which was based in Friedrichshafen on Lake Constance and produced the tractor model from 1957 to 1962. The Super S 308 is a tractor from the Super range from Porsche Diesel. The Porsche Super S 308 was a long version of the Porsche Super N 308 , which had comparable technical properties. The Porsche Super S 308 was the successor model of the Allgaier A 133 S, whereby the technical equipment corresponded to that of the Super N 308. The Super S 308 was later replaced by the more modern Porsche Super N 309 .
The Porsche 308 Super S had a standing four-stroke - three-cylinder diesel in-line engine with air cooling . The engine was equipped with pressure circulation lubrication and the swirl chamber method. As with the previous models, the innovative Porsche Optima combustion process with hanging valves was also used in the Porsche Super S 308. In addition, the engine of the Super S 308 had a Bosch injection system and a radial cooling fan with a modern thermostat control. With an output of around 28 kW, the tractor reached a maximum speed of 20 km / h .
The Porsche Super S 308 had a ZF or Getrag gear change transmission with a total of six gears. In addition, the model could be equipped with a crawler gear . A combined dry and oil-hydraulic double clutch made it possible to move off under high loads in all gears. This made it impossible for the engine to stall. The tractor also had a switchable PTO shaft as a ground and standard PTO shaft and another rear gear PTO shaft . Thanks to the double clutch technology, these could also be disengaged separately. The foot-operated inner-shoe brake on the rear wheel of the Porsche Super S 308 acted as a brake that could also be used individually as a steering brake. In addition, an independent lockable handbrake , which acted directly on the transmission , was installed. In addition, the tractor was equipped with a single- wheel sprung and extendable swing axle as the front axle. The rear axle , on the other hand, was designed in a portal design and had a differential lock that was operated by foot. The Porsche Super S 308, which weighs around 1,530 kg, could optionally be equipped with a hydraulic power lift with three-point hitch.
literature
- Armin Bauer: Porsche tractor 1937 to 1966. Schwungrad Verlag, Obershagen 2003, ISBN 3-933426-11-1 .