Reasons for higher hydraulic oil temperature of grader       

In the use of a PYl 65B grader, the hydraulic pump, hydraulic tank and other hydraulic components surface hot phenomenon.

In order to ensure the good working performance of the grader, the temperature of the hydraulic oil should be controlled at about 55 degrees centigrade, and the maximum temperature should not exceed 85 degrees during the continuous operation. Such as hydraulic pump, hydraulic oil tank and other components of the surface feels hot, that high temperature system, may cause the decrease of hydraulic oil viscosity, the system leakage increased significantly: lubrication performance of hydraulic oil, causing friction between each pair element increases, in turn, further promote the temperature of non metallic elements will in the system of accelerated aging, the deterioration of oil.

The reason of high oil temperature may be that the flow capacity of the selected hydraulic valve is insufficient, causing the local pressure loss is too large, resulting in excessive heat in the hydraulic system. In addition, the hydraulic system diagram of the grader shows that the hydraulic oil of the work and the steering hydraulic system does not pass through the cooler, and the oil temperature of the hydraulic system is also increased due to the heat dissipation of the oil tank surface.

Through the above analysis, the oil temperature in the high plains may take the following measures:

(1) increasing the surface area and volume of the fuel tank, fuel tank design and Hunchun internal structure, increase the partition and enlarge the heat radiation area. In this way, the hydraulic oil can be extended to the oil suction pipe from the outlet of the oil return pipe to prolong the residence time of the hydraulic oil in the oil tank, effectively play the heat dissipation effect of the oil tank wall, and facilitate the analysis of the bubbles in the hydraulic oil. If the leveling machine is limited, it is impossible to increase the fuel tank and other measures, should be installed by the oil cooler to heat dissipation.

(2) in the hydraulic system of pipeline design and installation should be reasonable. The grader on various pipeline is longer, so to rationally design and layout of pipeline, pipe diameter selection right, bending as grass cut pipe, thereby reducing the pipeline for installation of substandard and increased heat hunchun.

(3) of the hydraulic steering device and the hydraulic valve, especially overflow valve valve in the test, in accordance with the requirements of the pressure and flow of hydraulic oil, according to the data of the test, a reasonable choice of relief valve type: should also consider the minimum stable flow throttle valve: maximum flow valve should be according to other meat the access circuit required for selection. At the same time, the pressure of each valve should be adjusted reasonably.

(4) regular cleaning of the relevant components of the hydraulic system to avoid the abnormal wear and oil temperature rise due to various impurities in the system.