Tractor hydraulic valve


To convert hydraulic energy into mechanical energy, the hydraulic system needs to control the output hydraulic flow and pressure according to the operational requirements, and the Tractor Hydraulic Valve is one of the key components to control the output flow and pressure of the hydraulic system.

Reasons for the failure of tractor hydraulic valves

The hydraulic valve is used for too long, and the fitting clearance caused by wear, cavitation and other factors is too large, and the internal leakage increases.

The hydraulic oil is not clean, and the hydraulic valve spool is clamped or malfunctioning due to the deposition of pollutants.

Tractor hydraulic valve main maintenance content

1.The valve core and valve body bore of the spool of the spool assembly: when the gap between the two is 20%-25% larger than the assembly gap value specified in the product drawing, the valve core must be repaired after increasing the size.

2.Spool and seat of poppet valve components: When the conical seat seal is in poor contact, the poppet valve can automatically compensate for the gap under the action of the spring, so only grinding is required.

3.Repair of valve components such as jamming, brushing, grooves, etc.

4.Repair of pressure regulating springs.

5.Replacement of seals

Disassembly cleaning repair method of tractor hydraulic valve

Because 70% of the faults come from the unclean oil, so that the inside of the valve components is not clean, so disassembling and cleaning is one of the maintenance methods. For many faults caused by oil deposition caused by hydraulic oil pollution, or hydraulic valve core jamming caused by granular impurities in hydraulic oil, it can be eliminated after disassembly and cleaning, and the function of the hydraulic valve can be restored.

Check for cleanup. Remove the dirt on the surface of the hydraulic valve, use a brush non-metallic scraper, silk cloth to clean the dirt on the surface of the hydraulic valve, pay attention not to damage the surface of the hydraulic valve, especially do not scratch the installation surface of the plate valve.

Disassembly. Before disassembly, it is necessary to grasp the structure of the hydraulic valve and the connection between the parts, and remember to mark the position relationship between the parts when dismantling, and the forced disassembly may cause damage to the hydraulic valve.

Cleaning. Put the valve body, valve core and other parts on the tray of the cleaning box to heat and soak, enter the bottom of the cleaning tank with compressed air, and clean off the residual dirt through the agitation of the bubbles.

Finely washed. Cleaning with high-pressure positioning of cleaning liquid, and finally drying with hot air, existing cleaning agents can be used if possible, and organic cleaning agents can also be used in individual occasions, such as diesel and gasoline. Some inorganic cleaning liquid is toxic, heating volatilization can make people poisoned, should be used carefully, organic cleaning liquid is flammable, pay attention to fire prevention, pay attention to its corrosiveness when choosing cleaning liquid, avoid corrosion to the valve body, clean parts should be preserved, to avoid rust or re-pollution.

After the failure or failure of the hydraulic valve, most of the hydraulic system functions are restored by replacing new components, and the failed hydraulic valve becomes a waste product, in fact, most parts of these hydraulic valves are in good condition, and the function can be restored after local maintenance. The economic benefits are considerable.


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