Solution to the heating failure of hydraulic system of excavator
Excavator hydraulic system heating failure: For such failures, generally speaking, the first step should start from the internal analysis of the external hydraulic system. The internal reason is mainly caused by unreasonable system design. Such as the unreasonable matching between the components, the pipeline channel is too thin, the elbow is too many, the bending radius is small, and the fuel tank volume is not enough. Such problems should be fully considered in the design stage, otherwise the hydraulic system of the excavator will be congenital insufficiency, which will be difficult to overcome after the product is made. (1) Excavator driving wheel heat caused by external causes of the hydraulic system: such as Komatsu PC200-5 excavator hydraulic pump engine is connected through the shock absorber in the shock absorber box. When dealing with the heat failure of the hydraulic system of an excavator, it was found that the oil level in the shock absorber tank was much higher than the observation oil level screw (usually about 1.5L), and the excessive oil was accompanied by the rotation of the shock absorber damper. In the process, a large amount of heat is generated and transferred to the hydraulic pump, and the driving wheel of the excavator is too hot, which causes the system to heat up. At this time, after draining the shock absorber oil to the standard oil level, the fault can be eliminated. There are two reasons for the high oil level of the shock absorber. One is that the operator blindly refuels; the other is the aging of the oil seal at the shaft end of the hydraulic pump, which causes the hydraulic oil to leak. The latter should remove the plug and replace the oil seal. (2) Poor heat dissipation performance of the radiator causes excessive oil temperature: The main forms of poor heat dissipation performance of the radiator are: deformation or clogging of the external radiating fins, poor cooling effect; insufficient cooling fans; blockage of the internal pipes of the hydraulic oil radiator. In addition to the intuitive judgment of the first two, it can also be known from the little change in the temperature difference between the upper and lower tubes of the radiator. At this time, the heat sink should be cleaned, and the fan belt should be tightened. To judge the internal pipeline blockage of the hydraulic oil radiator, you can install a pressure gauge at the inlet and outlet oil passages of the radiator to check the pressure difference between the driving wheel of the excavator and the driving wheel of the excavator. The oil temperature is about 45oC and the pressure difference is 0.12. Below MPa, it is normal. If it is higher than 0.12MPa, it means that the oil pipe is seriously blocked. The upper and lower covers of the radiator should be removed and the pipes should be cleared.