Impact of construction machinery hydraulic oil quality factor

The quality of hydraulic oil , not only affects the normal operation of construction machinery , id cable ties and may cause serious damage to the hydraulic system components . Now summarize the work practice in the absence of dedicated instrumentation several cases , simple identification of hydraulic oil quality.
1 water . The amount of oil in the water content of water in accordance with GB GB/T1118.1-94 technical standards, and tested its quality indicators should be not more than traces if excessive moisture in the oil , it must be replaced ; Otherwise , not only will damage the bearings , but also to rusty steel surface , thus the hydraulic oil emulsion , deterioration and a precipitate , hinder thermal cooler , affect the valve , reducing the active area of ​​a filter , increasing the abrasive action of the oil .
( A ) visual method : If the oil is milky white turbid , then the oil contains large amounts of water .
( 2 ) combustion method: using a clean, dry cotton or tissue stained with a little oil to be detected , then the use of fire to ignite . If you find " crackling" sound or flash the burst phenomenon , then the oil contains more moisture
(2) oxidation. General construction machinery hydraulic oil operating temperature of 30-80 ℃, hydraulic oil temperature is closely related to their work life , experience tells us that when working oil temperature above 60 ℃ , each additional 8 ℃, oil life is halved , that is the life of the oil 90 ℃ 60 ℃ about 10% of oil , because the oil is oxidized. Oxygen and hydrocarbon oils reacting the oil slowly oxidized, black color , viscosity increase , and finally could not be serious enough to oxide dissolved in the oil , and brown mucus layer deposition to somewhere in the system , easily blocked element in the control oil passages , so that ball , valve, hydraulic pump piston wear increased , affecting the normal operation of the system . Acid oxidation also cause corrosion . Slowly began to carry out the oxidation process , when it reaches a certain stage, the oxidation rate will suddenly accelerated, will follow the sudden increase in viscosity , resulting in working oil temperature , the oxidation process faster , the accumulated sediment and acid will be more Finally the oil can not be reused.
3 impurities. Impurities can not only wear the moving parts , but once they are stuck in the spool or other deputy campaign , you will affect the normal operation of the whole system , Fixed Length plastic seals cause the machine to malfunction.
4 air . If the hydraulic oil containing gas , when the bubble wall and the overflow will impact the formation of cavitation generated elements , so that the system does not work , a little longer will result in component damage .
5 . Chemical reaction. Tank shall be cleaned of paint , etc., can cause chemical changes in the oil .