Position control: In this system, constant depth of ploughing is maintained by automatic adjustment of draft of tractor. There are three important methods in hydraulic control system: Oil filter: It is small filter, located at a convenient position in the passage of the oil. Thus the control valve is to perform three functions: In some tractors, separate tank is there for hydraulic oil.Ĭontrol valve: Control valve is a type of valve, which controls the movement of hydraulic oil to have desired direction, magnitude and speed of lifting. In some tractors, transmission chamber itself works as a hydraulic tank and same oil is used for transmission system as well as hydraulic system. Hydraulic tank: Hydraulic tank is used for storing hydraulic oil for the system. The lifting arms are raised by the hydraulic pressure while raising the implement but it is lowered by its own weight. Piston moves in the hydraulic cylinder and causes reciprocating motion in the cylinder. The connecting rod transmits power from the piston to the lifting arms. Hydraulic cylinder: It is a bigger size cylinder, fitted with a piston and a connecting rod. The oil pressure in the pump varies from 150 to 200 kg/cm 2.Schema Gear pump can flow a bigger amount of oil, compared to plunger pump. Hydraulic pump: There are several types of hydraulic pump, such as gear pump, plunger pump, vane pump, and screw pump. It is separate from the transmission chamber. (ii) There is a special tank for hydraulic oil. (i) There is a common oil reservoir for hydraulic system and the transmission system in some tractors, There are two types of arrangements for storing hydraulic oil in the system: The hydr aulic pump is operated by suitable gears, connected with engine. The lifting arms are attached with implements. From the control valve, the oil goes to the hydraulic cylinder to operate the piston, which in turn, raises the lifting arms. Operation: The hydraulic pump draws up oil from the oil reservoir and sends it to the control valve under high pressure. Small force acting on small area can produce higher force on a surface of larger area This law states that the pressure applied to an enclosed fluid is transmitted equally in all directions. Working principle: The working principle of hydraulic system is based on pascal's law.
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