![]() The top link is used for connecting the third hitch point of the implement and is adjustable for maintaining the implement level and suction angle. Any movement of the piston is transferred to the bottom links. The lift arms are directly mounted on a rockshaft, which is further connected to the piston rod. Both the bottom links are connected to two lift arms through lift links. The implement is connected to the tractor hydraulic system at two bottom links and one top link. Implement control: The tractor with a built in lift system is connected to the implement through a specific type of mechanical linkage termed as three point linkage and the system is known as mounted system. (4) Good balancing of attached implements. (3) Automatic hydraulic control of implements such as position control, draft control etc. Three-point linkage: It is a combination of three links, one is upper link and two are lower links, the links articulated to the tractor and the implements at their ends in order to connect the implement to the tractor. It is fitted at the rear part of the tractor. It consists of a crossbar with suitable holes, attached to the lower hitch links. Implements can be of Trailed, Semi-mounted and Mounted type.ĭrawbar hitch: Drawbar is a device by which the pulling power of the tractor is transmitted to the trailing implements. HITCH AND CONTROL BOARD OF TRACTOR HITCHįor the efficient and safe tractor operation, implements are to be hitched properly. The control system then raises the implement until the draft is back to the present level and the implement is at the original depth again using the draft control system. This increase is sensed through the top link or lower links. If any implement goes too deep its draft increases. The hydraulic control valve reacts to changes in the loading in either the top or lower links which arc due to changes in the draft or pull required by the implement. In this system the control valve can be operated directly by the driver to raise lower or hold an implement, mounted on the linkage at any chosen height.ĭraft control: In this system, the working depth of any implement can be controlled continuously without the need for a depth wheel on the implement. 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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