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2. Two-wheel tractor - Wikipedia

   en.wikipedia.org/wiki/Two-wheel_tractor

   Alternatively, the term "power tiller" or "rotary tiller" as is understood in Asia and elsewhere is the rubber- or iron-wheeled, self-propelled machines of 5–18 hp (3.7–13.4 kW) usually powered by heavy-duty single-cylinder diesel engines (and many Asian countries historically have had to pay a high luxury tax on petrol/gasoline).

3. Power steering - Wikipedia

   en.wikipedia.org/wiki/Power_steering

   Power steering is a system for reducing a driver's effort to turn a steering wheel of a motor vehicle, by using a power source to assist steering. [1]Hydraulic or electric actuators add controlled energy to the steering mechanism, so the driver can provide less effort to turn the steered wheels when driving at typical speeds, and considerably reduce the physical effort necessary to turn the ...

4. Small engine - Wikipedia

   en.wikipedia.org/wiki/Small_engine

   The combustion cycle can be either two-stroke (which results in a lighter engine for a given power output) [3] [4] or four-stroke (which produce lower levels of exhaust gas emissions). [5] [6] The fuel is usually either petrol or diesel. [7] In 1973, a small Wankel (rotary) engine manufactured by NSU was used in a lawn mower. [8]

5. International Harvester - Wikipedia

   en.wikipedia.org/wiki/International_Harvester

   Other diesel engines of this era were difficult to start in cold weather and using gasoline allowed the engine to thoroughly warm up first. In 1935, it was used in the WD-40, becoming the first diesel tractor on wheels in North America [ 17 ] (the world's first diesel tractor was Germany's Benz-Sendling BS 6 in 1922).

6. Steam tractor - Wikipedia

   en.wikipedia.org/wiki/Steam_tractor

   Later improvements included power steering, differentials, compounded engines, and butt-strap boiler design. The steam engine was gradually phased out by the mid-1920s as the less expensive, lighter, and faster-starting internal combustion (kerosene, petrol or distillate) tractors fully emerged after World War I.

7. Steering - Wikipedia

   en.wikipedia.org/wiki/Steering

   A Hydraulic Power Steering (HPS) uses hydraulic pressure supplied by an engine-driven pump to assist the motion of turning the steering wheel. Electric Power Steering (EPS) is more efficient than hydraulic power-steering, since the electric power-steering motor only needs to provide assistance when the steering wheel is turned, whereas the ...