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Views: 266 Author: Site Editor Publish Time: 2020-11-23 Origin: Site
The tractor hydraulic system is an important source of power for farm implement operations. Understanding the technical characteristics of the main components of the tractor hydrostatic drive systems and using the hydraulic system correctly can effectively reduce the tractor hydraulic system failures and increase productivity. Today we will introduce some main components of tractor hydraulic system.
The plunger oil pump is mainly composed of pump body, plunger, plunger spring, eccentric wheel, steel ball and one-way valve. Because the control valve and safety valve are also installed on the pump body, the structure is compact and the oil leakage is less.
The entire oil pump and control valve are fixed on the front cover of the gearbox with 3 bolts. An eccentric wheel is made on the L shaft of the gearbox, and a 108 ball bearing is installed on it. The plunger spring keeps the plunger in contact with the 108 ball bearing.
There is a ring groove in the middle of the plunger, which communicates with the oil inlet and the oil return. A hole drilled in the groove communicates with the axial hole in the center of the plunger to form the oil inlet of the oil pump.
A steel ball is installed above the axial hole. In order to limit the lifting height of the steel ball during the oil suction stroke of the plunger, a stop pin is installed above the steel ball.
There is a one-way valve above the plunger, which is composed of a one-way valve, a one-way valve spring and a one-way valve screw cover. It is a one-way oil valve used to control the oil chamber and high-pressure oil circuit of the plunger pump. The one-way valve opens when the plunger supplies oil and closes when the oil is sucked.
The safety valve is installed on an oil passage parallel to the main oil passage on the side of the oil pump. It can limit the maximum working pressure of the hydraulic system to protect the mechanical parts from damage.
The control valve of a small tractor is a rotary valve type directional control valve, which is used to control the flow direction of oil. It has three positions of lifting, neutral and descending, which can realize the three working conditions of lifting, maintaining at a certain height and descending of the agricultural tools.
The control valve is installed in the seat hole on one side of the pump body. The valve core has a special cross-sectional shape, forming two arc-shaped grooves and two flanges. The valve core is also drilled with a radial hole and an axial hole.
The hydraulic oil cylinder is installed in the oil tank and consists of a cylinder block, a piston, a piston rod, a drain valve and a limit plate. Two O-shaped oil-resistant rubber seals in the piston ring groove can seal the matching gap between the cylinder and the piston.
The fuel tank is composed of a back cover, a back cover bottom plate and a refueling vent plug. It is fixed on the upper rear of the gearbox housing, replacing the rear axle upper cover.
The refueling vent screw plug on the upper rear of the fuel tank can keep the tank always open to the atmosphere, ensuring that the pressure above the liquid level is always equal to the atmospheric pressure, so as not to change the pressure in the tank when the oil temperature changes and affect the fuel supply. Unscrew the refueling vent plug to fill the oil tank with hydraulic oil.
JAZZY is a professional hydraulic system components supplier with good-quality hydraulic hose fitting, sae hydraulic adapter, hydraulic quick release coupling, one piece hydraulic hose fitting and so on. If you have any need about any kind of hydraulic system component, you are welcome to contact us.
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