Analysis of the reasons for the short service life of the hydraulic pump

The hydraulic pump is the most important component of the hydraulic system and any hydraulic pump-related malfunction can cause severe damage to the entire system, affecting performance and productivity. A hydraulic pump's short life can be a burden to machine operators and can be costly due to frequent repairs or replacements. There are many reasons for a hydraulic pump malfunction. But the frequent occurrence of pump problems requires a complete check of the system. The reasons may be contamination, incorrect selection of components, incorrect selection of oil, etc. The causes of hydraulic pump problems are discussed in this article.

Pollution: Contaminants in the hydraulic system will change the properties of the oil and cause the oil to be polluted. In addition, sludge or varnish accumulated due to lack of maintenance or prolonged operation will also contaminate the liquid. These contaminants will reach the hydraulic pump through hoses/tubes when the system is running. Particulate matter and oil contamination will increase the friction between the pump parts, which will lead to wear and other wear that shortens the life of the pump. Undesirable changes in fluid properties (especially VI, flame retardant, compressibility, emulsibility, material compatibility, etc.) will also affect pump performance. For example, high fluid viscosity will lead to mechanical-hydraulic inefficiency and low fluid viscosity will cause leaks.

Incorrect pump selection: Rexroth hydraulic pumps

are of different types and the ideal pump selection is required for smooth and long operation. Pumps can be mainly classified into piston, vane and gear pumps. Factors to consider when choosing a pump are pump inlet operation, working environment, flow rate and pressure, material compatibility, and more. The compatibility of materials is analyzed with the help of chemical compatibility tables.

Incorrect assembly of components: Improperly assembled hydraulic components can damage the pump. Incorrect assembly means incorrect insertion depth, incorrect valve settings, incorrect pump shaft rotation and more. Among these factors, incorrect hose insertion depth is the most serious concern. he is called; When fixtures are not connected properly, there is a strong possibility that fixtures will explode when exposed to high pressure. It is also necessary to check the pump pressure compensator and relief valves.

Piping geometry: The geometry of the pipes/hoses in the hydraulic circuit must be considered when the hydraulic pump encounters any problem. Many twists and turns in the circuit will affect fluid flow and cause poor system performance.

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