How to reduce the pollution of gear pump hydraulic oil

Because the causes of gear pump oil pollution are complex, and hydraulic oil is constantly polluting, fully resolving the hydraulic oil pollution problem is extremely difficult. It is a more practical approach to manage the pollution of hydraulic oil within a particular limit in order to extend the life of hydraulic parts and ensure the reliable functioning of the hydraulic system. The following steps are frequently done to decrease the pollution of gear pump hydraulic oil:

Hydraulic parts and systems are cleaned to remove impurities that have remained after processing and assembly

After each processing step, hydraulic parts should be purified and thoroughly cleaned. The tank and piping must be cleaned before the assembly of the system. Pickling is followed by the mechanical removal of residues and surface oxides. After assembly, clean the system completely. Instead of kerosene, it’s recommended to use the system’s original oil. Except for the ventilation openings in the fuel tank (including a dust cover), everything must be shut for cleaning. Cleaning should involve increasing the flow as much as possible and flushing with hot oil if possible. Mechanical oil viscosity at 80°C is 1/8 that at 25°C, so thermal-mechanical oil at 80°C can wash away any impurities that can’t be washed away with water. A high-efficiency oil filter should be used when flushing the system, and the hydraulic parts should oscillate, as well as the welding joints and connecting parts, which should be hammered with a copper hammer.

Prevent the intrusion of pollutants from the outside

Because the hydraulic oil will be polluted by the environment throughout the working process, you can either place a high-efficiency air filter on the oil tank’s breathing hole or use a sealed oil tank to prevent dust, abrasives, and coolant from getting in. The hydraulic fluid becomes contaminated during shipping and storage, therefore it must sit for a few days before being injected into the system via an oil filter. A dust seal should also be fitted on the end of the piston rod, which should be examined and replaced regularly.

Use a suitable filter

This is an important method for regulating the level of pollution in hydraulic oil. Filters with various filtering precisions and structures should be chosen based on the system’s circumstances and should be checked and cleaned regularly.

Control the temperature of hydraulic fluid

Hydraulic oil with an excessive operating temperature is bad for hydraulic equipment, and the hydraulic oil itself will speed up oxidation and deterioration, create microorganisms, and limit its service life. In general, the hydraulic system’s working temperature should be kept below 65°C, and the machine tool’s hydraulic system should be smaller.

Check and refill hydraulic fluid on a regular basis

Sample the oil in the system at regular intervals to see if the contamination level is still within the system’s allowed use limit. It must be replaced immediately if it does not fulfill the standards. When the oil becomes sufficiently contaminated that the system stops working, it should not be replenished. The entire system must be cleaned before installing new hydraulic oil.

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