| 词条 | Fortschritt ZT 300 | |||||||||||||||||||||||||||||||||
| 释义 |
|name = Fortschritt ZT 300 |image = GDR tractor ZT 300 (aka).jpg |caption = ZT 300 |manufacturer = Traktorenwerk Schönebeck |production = 1967–1984 |length = 4690 mm |width = 2020 mm |height = 1800 mm |weight = 4820 kg |propulsion = Tyres |type = agricultural |preceded = RS14 |succeeded = Fortschritt ZT 320 | engine_model = 4 VD 14,5/12-1 SRW | gross_power = | flywheel_power = 74 kW | drawbar_pull = On wet surfaces: ZT 300: 13 kN ZT 303: 18 kN At slopes, ZT 303: 34 kN[1] | speed = 28,84 km/h }} ZT 300 is a series of 20-kN-tractors produced from 1967 to 1984 by the VEB Traktorenwerk Schönebeck. It succeeded the RS14 Famulus series and unlike the Famulus, the ZT 300 series was sold under the brand name Fortschritt. ZT 300 stands for the ZT 300 series tractors as well as the initial tractor Fortschritt ZT 300. In total, 72.382 tractors were made. The most built model was the ZT 303 introduced in 1972 with automatic all-wheel-drive; in the early 1980s it would cost 81.000 Mark. Starting in 1983, the ZT 300 series was succeeded by the ZT 320. ChronologyThe following tractors were ZT 300 series models:
Some tractors were converted into road-rail-vehicles. They were mainly used in small DDR-plants to rank freight waggons. Technical descriptionThe ZT 300 series tractors construction is based on a combination of the frameless block construction for the rear part and a half frame for the front. This makes the rear axle a rigid axle, while the front axle is a rigid swing axle. The ZT 300 has a three-point-linkage with a lifting force of 17,65 kN and a PTO as well as a hydraulic system. Starting in 1974, an optimised hydraulic system was used, that automatically increased the weight on the rear axle by slightly lifting the farm implement attached to the three-point linkage. This resulted in better traction and therefore greater drawbar pull force.[1] All ZT 300 tractors have a manual three-speed semi powerspeed transmission with three groups and two extra reverse groups, this results in a total of nine forward and six reverse gears. It allows speeds between 3,1 and ca. 30 km/h. A pneumatic two stage clutch of the type DK 80 is used to transmit the torque to the gearbox. The first clutch stage connects the gearbox, the second stage connects the PTO shaft(s), hydraulic system and the load stage of the gearbox. The load stage increases the torque transmitted to the wheels. It can be switched without having to stop the tractor by moving the load stage lever and pressing the clutch pedal. The rear axle also has a differential lock. The engine is the 4 VD 14,5/12-1 SRW, an inline four-cylinder direct-injected diesel engine with a displacement of 6560 cm3. Initially it was detuned to produce 66 kW at 1500 min−1,[3] but in 1973 the power was increased to 68 kW and in 1978[1] to 74 kW at 1800 min−1.[3] The maximum torque is 422 N·m at 1350 min−1. The specific fuel consumption is rated 238 g/kWh at 1350 min−1. The initial ZT 300 models have a rack-and-pinion steering, while later models have a fully hydraulic steering system. Only the rear wheels have brakes. All tractors may pull trailers with a maximum payload of 24.000 kg if the trailer has a pneumatic brake system. All wheel drive systemThe all wheel drive system enables itself automatically using a roller-type overrunning clutch if the wheel slip is greater than 7–8%. The front axle is same as in the IFA W50 LA, this results in less ground clearance compared to the rear wheel drive ZT 300 tractors. As well as the rear axle, the AWD front axle has a lockable differential. The ZT 305 also has brakes for the front wheels, bigger tyres and rear twin tyres, it was developed for slopes with gradients of up to 45 %. Forward and reverse speeds
PaintworkThe ZT 300 series tractors were made with four different paintworks:
ReferencesBibliography
External linksZT 300{{Commonscat|Fortschritt ZT300}}ZT 303{{Commonscat|Fortschritt ZT303}} 1 : Tractors |
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