переведите текст
Components of Tractors
Nowadays tractors are widely used in agriculture and in industry. In agriculture tractors are used in such jobs as plowing, planting, cultivating, fertilizing, harvesting, transport works, etc.
In different branches of industry tractors are used as road transport tractors hauling heavy loads. They are also used for different building purposes.
Tractors may be agricultural tractors, road transport tractors and special tractors.
Agricultural tractors are subdivided into: the general tractors designed for hauling agricultural machinery; cultivators designed for specific agricultural jobs; tractors for operation on soft boggy ground.
Road transport tractors are equipped with a load carrying platform.
Special tractors are usually equipped with auxiliary devices. Tractors may belong either to wheeled-typetractors or totrack-layingtype tractors.
The construction of a tractor includes the following main units:
1.Power unit which includes the engine with all auxiliary devices – a radiator, a fan, a starter device, a fuel tank, a pump, etc.
2.Transmission which consists of a clutch, a speed control unit, universal joints, gearing mechanisms, shafts, steering mechanisms, a final drive, axles.
3.Driver which includes driving, supporting and controlling mechanisms.
4.A steering unit.
5.The tractor frame.
6.Working and auxiliary equipment.
Tractor engines have internal combustion engines as the source of power. Tractor engines requirements differ considerably from the requirements of the automotive engines. Automotive engines are generally unsuitable for tractors.