Read the text and decide if the following sentences are true (T) or false (F)

Tractor is useful when it supplies power to machines. Power can be supplied by the tractor in various forms. The tractor can pull or push machines, it can supply power to machines from the power take-off shaft and it can drive machines by means of a belt from a belt pulley. The tractor power is produced by the engine and is measured by horse powers (hp) or kilowatts. There are tractors with engine power from 3 to 300 hp. Tractors are classified according to the maximum power that their engine can produce. The crawlers or track laying tractors are large. They are used for heavy operations, such as road making or dam building. Large tracks increase the grip of the tractor on the ground and the crawlers are able to push or pull heavy loads and machines. Most of the tractors have tyres which can be placed closer or farther apart according to the distance between the rows that must be cultivated. Wheeled tractors may have mounted implements and machines on them. This is done by the three-point linkage, There are tractors with diesel or gasoline engines. The diesel engine will use less fuel than the gasoline engine for the same work done. The regular servicing of tractors is necessary because it provides the tractor’s useful work. The fuel should be clean and have no water. If the engine is water-cooled one must be sure that there is water in the radiator, The radiator should be clean. The oil has to be changed regularly.