1, hydraulic oil impurities cloudy - hydraulic oil impurities are mainly three types, namely, solid impurities (debris, solid particles, solid impurities formed by the deterioration of hydraulic oil, etc.), liquid impurities (mainly water, followed by the formation of viscous impurities in the deterioration of hydraulic oil) and gaseous impurities (mainly air).
If the hydraulic oil appears white turbidity phenomenon, can exclude the possibility of solid impurities or liquid viscous impurities, can only be caused by water or air. Hydraulic oil can be sampled and tested. Oil samples dropped on a hot iron plate, if there are bubbles (water at high temperatures into water vapor to form bubbles), it can be determined that there is water in the hydraulic oil, otherwise the hydraulic oil contains air.
If the hydraulic oil is mixed with water to cause turbidity, the hydraulic oil will be static for a period of time, so that the water sinks to the bottom of the hydraulic oil tank, and then remove the water can be. However, if the water content is too high, resulting in emulsification of the hydraulic oil, you need to replace the new hydraulic oil. If it is determined that the hydraulic oil is mixed with air to cause turbidity, you should check whether the hydraulic system piping leakage, and cut off the source of air mixing.
2, the hydraulic oil temperature is abnormally high - hydraulic oil temperature abnormally high root causes are the following three aspects:
First, due to the safety valve pressure setting is too low, so that most of the hydraulic oil through the safety valve flow back to the tank, resulting in the hydraulic system work efficiency is too low, such as excessive load, most of the energy will be converted into the thermal energy of the hydraulic oil, resulting in a very high temperature.
Secondly, due to the poor cooling effect of the cooling system, resulting in high temperature of the hydraulic oil.
Third, the hydraulic oil circulates too frequently in the oil circuit (often caused by insufficient oil), resulting in heat dissipation difficulties and high temperatures.
Troubleshooting should be from easy to difficult, first check the oil volume in the hydraulic oil tank, if the oil volume in the tank is insufficient, it should be added to the standard level in a timely manner. Refill should pay attention to the use of the same grade of hydraulic oil, should also be filtered before use.
If the oil quantity is appropriate, you need to check whether the oil cooling system is blocked. If you find out that the oil cooling system is blocking the air flow, you should clean it in time to ensure the normal flow of air and facilitate heat dissipation. Sometimes the fan tape is too loose and slippery, which will also lead to lower fan efficiency and poor cooling effect, it should be checked and adjusted in time, and replaced with a new tape if necessary. If there is no problem with the oil volume, oil cooling system and fan tape, it can be determined that the main safety valve set pressure is lower than the standard value. The pressure setting of the main safety valve should be adjusted again to the standard value.
3, the hydraulic oil is too dirty - hydraulic oil dirty, dirty, may be the fluid due to long-term use of chemical changes; may also be too many impurities in the physical changes. As long as you find the causes of these two changes, you can take appropriate measures. In the absence of the necessary testing equipment, equipment, to determine whether the hydraulic fluid is a chemical change or physical change, a relatively simple and practical method is to use filter paper testing. Sampling of hydraulic oil, oil drops to the filter paper, observe the formation of the oil halo, if the oil halo appeared in the stratification, circle phenomenon is more obvious (the middle of the dirtier, the more the edge of the clearer), indicating that the hydraulic oil deterioration, must be replaced with new oil; if the oil halo uniformly spread out, indicating that the hydraulic oil is too much impurity content, we must check the oil filter in a timely manner to replace the filter, change the cartridge, replace the new hydraulic oil, if necessary.
