Identification and troubleshooting of oxidative emulsification deterioration of hydraulic oil!
November 10, 2022
The quality of hydraulic oil will not only affect the normal operation of construction machinery, but also damage the parts of hydraulic system. The students of Business Opportunity Park summarized the identification methods of hydraulic oil quality change in practice for reference:
1. Identification of oil in oil pump: take out a small amount of measured oil from the oil pump. If it is found that it is milky white and turbid (sometimes like yellowish milk), and it contains a lot of water when identified by combustion method, and it is felt that it has lost its viscosity with your hands, it indicates that the oil has been thoroughly emulsified and deteriorated and should not be reused.
2. Identification of oil in oil tank: take out a little measured oil from the oil tank and filter it with filter paper. If there is black residue on the filter paper and there is a pungent smell, it means that the oil has been oxidized and deteriorated. You can also directly take out part of the precipitated oil sludge from the bottom of the oil tank. If there are many asphalt and gum deposits, put them on your fingers and pinch them. If you feel a lot of gum and strong adhesion, it means that the oil has been oxidized and deteriorated.
Deterioration of hydraulic oil (that is, performance degradation) refers to the gradual deterioration (aging, pollution, etc.) of hydraulic oil during its use, which results in the decline of its main performance indicators beyond the service limit. It is called hydraulic oil degradation. When the hydraulic oil deteriorates, its performance will change, resulting in failure. 1. Faults caused by low viscosity: 1) The pump is noisy and the oil discharge is insufficient, resulting in abnormal wear. Cause - The oil temperature is not strictly controlled, and the oil temperature rises. Troubleshooting - Take freezing measures or repair the cooling system. 2) The internal leakage increases, and the action of the actuating element is abnormal. Cause - The hydraulic oil deteriorates and the viscosity becomes low. Troubleshooting - change the oil 3) The pressure control valve is unstable, and the pressure change pointer swings. Cause - viscosity becomes low. Troubleshooting - change the oil. 4) Due to poor lubrication, its lubricating surface has abnormal wear. Cause - the hydraulic oil is polluted and deteriorated. Troubleshooting - replace the hydraulic oil. 2. Faults caused by higher viscosity: 1) The pump is blocked due to poor oil suction. Cause - The viscosity of the oil is too high. Troubleshooting - change the oil 2) Cavitation is caused by pump oil suction resistance. Cause - The low temperature characteristics of the hydraulic oil are poor. Troubleshooting - Set the heater for temperature regulation. 3) The resistance of the oil filter increases and causes failure. Cause - Poor oil temperature control at low temperature. Troubleshooting - Repair the control. 4) The pressure loss caused by the relevant impedance reduces the output force. Cause - The viscosity of the hydraulic oil is too high. Troubleshooting - replace the hydraulic oil or blend the low viscosity hydraulic oil. 5) The action of the control valve is delayed or poor. Cause - The viscosity used is too high. Troubleshooting - change the oil.
