Tractor hydraulics harshit

hydraulic system

1. By- Harshit joshi Guidance by – dr. r.n. Shrivastava dr. preeti Jain College of Agricultural Engineering Jabalpur

2. Tractor Hydraulics

3. Content Introduction Working principle Why Hydraulic System Parts of Hydraulic System Types Of Hydraulic System (a) Based on center system (b) Based on control Types of hydraulic pump Maintenance and Repair

4. Introduction A unit responsible for lifting and lowering an agricultural implement Fluid is confined inside pipelines, reservoir and cylinders Hydraulic pumps transfer the fluid from the reservoir to the hydraulic system. This transfer raises the energy level of the fluid by increasing its pressure . The motor provide the power source for the pump

5. Working Principle The working principle of hydraulic system is based on pascal’s law. This law states that the pressure applied to an enclosed fluid is transmitted equally in all directions . Small force acting on small area can provide higher force on a surface of larger area.

6. Why hydraulic system Simpler than mechanical linkage systems System is flexible enough Power can be engaged or disengaged using a simpler valve Input heavy force can be controlled easily A good range of speed operation is possible Is safer than mechanical system

7. Parts of hydraulic systems Reservoir Pump Distributer Valves Fluid Motor Hose Filter Cylinder

8. Reservoir It contains sufficient oil to move the piston for lifting the load. Hydraulic filter Hydraulic filters are used to protect your hydraulic system component from damage due to contamination of oils caused by particles

9. Relief valve Relief valve are used in hydraulic systems to limit the system pressure to a specific set level. If this set level is reached ,the pressure relief valve responds and finds the excess flow from the system back to the tank .

10. Pump It forces the fluid from the reservoir to the cylinder . Control valves Control valve is a type of valve which control the movement of hydraulic oil to have desired direction ,magnitude and speed of lifting.

11. Hydraulic Motor A hydraulic motor converts hydraulic energy into mechanical energy: A rotating shaft .It uses hydraulic pressure and flow to generate torque and rotation. Hydraulic Hose Hydraulic hose is specifically designed to convey hydraulic fluid. It is typically flexible, often reinforced and usually constructed with several layers of reinforcement since hydraulic system frequently operated at high or very high pressures .

12. Types of hydraulic system Open center system Close center system Close center system

13. 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 as a system is known as mounted system . The implement is connected with tractor hydraulic system at two bottom links and one top link .Both the bottom link are connected with two lift arms through lift links .the lift arm is directly mounted with rockshaft ,which is further connected with piston rod.Any movement of the piston is transferred to the bottom links .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.Load sensing for the draft control can also be done through the top link,which is spring loaded. In some tractor the lower links are spring loaded for draft sensing. Depending upon the soil condition and type of operation, the mounted implement can be controlled either by potion control or draft control.

14. Position control In this system, constant depth of ploughing is maintained by automatic adjustment of draft of tractor. 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. Draft Control Under this system of control, the implement is set for a particular draft(drawbar pull) rather than depth. In varied soil conditions the implement automatically takes more or less depth to maintain the predetermined draft.

15. Maintenance and repair of hydraulic system For successful operation of any hydraulic system, cleaning and periodic maintenance is very essential .If the operation is alert and keeps the machine clean ,refills clean oil, replaces or clean the filter regularly,keeps the tubes and rubber hose tight and protect the system from dust and other contaminants , the system will undoubtedly work efficient with less trouble.

16. Thank You