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How often should I change the hydraulic fluid? china hydraulic valve block manufacturers,china high pressure hydraulic manifold blocks manufacturers

 

Previously introduced “hydraulic oil types and uses” and “how to choose hydraulic oil”. Next introduce how often to change the hydraulic oil is more appropriate, how to change the hydraulic oil. china hydraulic valve block manufacturers,china high pressure hydraulic manifold blocks manufacturers

 

After using hydraulic oil at high temperature and high pressure for a certain time, it will gradually deteriorate, and the following conditions will occur.

 

(1) State change of hydraulic oil. This refers to the aging phenomenon of oil products such as color, smell and appearance change of hydraulic oil. It can be smelly, dark and black, cloudy or precipitated. china hydraulic valve block manufacturers,china high pressure hydraulic manifold blocks manufacturers

 

(2) The flash point decreases.

 

(3) The acid value changed significantly.

 

(4) Increase of mechanical impurities.

 

(5) The deemulsification and anti-foam properties become poor.

 

(6) Stability deteriorates. china hydraulic valve block manufacturers,china high pressure hydraulic manifold blocks manufacturers

 

The deteriorated hydraulic oil cannot meet the requirements of the hydraulic transmission system and must be replaced. At present, there are three kinds of oil change cycle: empirical method, fixed cycle method and oil change method. china hydraulic valve block manufacturers,china high pressure hydraulic manifold blocks manufacturers

 

The experience method is based on the experience of the operator and the field technical personnel, through “look, smell, touch, shake” and other simple methods, stipulate that when the hydraulic oil becomes black, dirty, cloudy to a certain degree, it must be changed. Table 1-1 lists the hydraulic oil deterioration items to be identified on site.

Site identification of hydraulic oil deterioration items

Table 1-1 Onsite identification of hydraulic oil deterioration items

 

The fixed cycle method is based on different equipment and oil products, and the oil is changed after half a year, one year or 1000h ~ 2000h operation.

 

These two methods are widely used, but they are not very scientific, not very economic. The third method is the oil quality oil change method, it is by regularly taking oil samples for testing, measuring the necessary items, in order to continuously monitor the deterioration of the oil, according to the physical and chemical properties of hydraulic oil index changes in the actual situation to determine when to change the oil, this method is more scientific, but requires a set of physical and chemical testing instruments. china hydraulic valve block manufacturers,china high pressure hydraulic manifold blocks manufacturers

 

Determine the index of hydraulic oil change

 

Although the replacement indexes of hydraulic oil are different among different countries and companies, the control items are almost the same but differ a little. The indexes of L-HL and L-HM hydraulic oil formulated in China are shown in Table 1-5.

Site identification of hydraulic oil deterioration items

The list of the hydraulic oil deterioration items is continued

Table 1-5 Onsite identification of hydraulic oil deterioration items

 

The steps and methods of changing hydraulic oil

 

(1) When changing oil, the remaining hydraulic oil in the hydraulic transmission system should be emptied.

 

(2) Identify the type and grade of hydraulic oil, and confirm that the type and grade are consistent with the requirements. The hydraulic oil stored too long must also be tested to confirm whether it can be used. china hydraulic valve block manufacturers,china high pressure hydraulic manifold blocks manufacturers

 

(3) The whole process from taking oil to filling oil should keep the mouth of the barrel, the mouth of the pot, the funnel and other vessels clean.

 

(4) Oil injection should be filtered.

 

(5) When refueling, special refueling trolley should be used to add to the specified height through the refueling port with refueling filter.

 

(6) Close the sealing cover. china hydraulic valve block manufacturers,china high pressure hydraulic manifold blocks manufacturers

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