As the "heart" of the field of construction machinery, the stability of the hydraulic system is directly related to the operation efficiency and construction safety of the excavator. Recently, industry technical experts pointed out that the "invisible fault" of hydraulic oil overheating is becoming a potential risk that threatens the life of equipment. According to statistics, about 30% of hydraulic system failures are related to abnormal oil temperature, but its concealment causes many users to fail to intervene in time.

The heat set off a chain of crises

Every 10℃ increase in the temperature of the hydraulic oil, the risk of thermal deformation of the precision components of the system increases significantly. Different material parts due to the difference in expansion coefficient, may lead to the imbalance of the matching tolerance, causing the valve body stuck, oil leakage and other problems. At the same time, high temperature leads to the decrease of oil viscosity, the attenuation of lubrication performance is accelerated, and the wear rate of components is increased by 2-3 times. More dangerous is that high temperature will induce cavitation phenomenon, produce corrosive bubbles, metal surface corrosion speed up by 40%, and accompanied by strong vibration and noise, forming a "vicious circle".

Four lines of defense build strong operation and maintenance barrier

In view of this industry pain point, experts put forward systematic solutions:

Operation environment control: avoid continuous high load operation in high temperature period, and increase forced heat dissipation device if necessary;

Dynamic oil management: check the oil level daily, replace the standard hydraulic oil and filter element every 2000 hours, it is strictly forbidden to mix different marks of oil;

Strict prevention and control of pollution: sealed equipment is used in the oil injection process, and the cleanliness of the oil is regularly tested. The pollution degree should be controlled within the level 8 of NAS 1638 standard.

Intelligent monitoring upgrade: install oil temperature sensor and early warning system to realize fault pre-processing.

A service director of a construction machinery manufacturer said: "Hydraulic oil management has entered the 'era of minimal invasiveness', predicting system health through oil sample analysis can detect potential failures 600 hours in advance." With the popularization of Internet of Things technology, more and more construction enterprises begin to use intelligent operation and maintenance platforms to realize the whole life cycle management of oil temperature, oil quality and fuel consumption.

Industry analysis points out that behind the problem of hydraulic oil overheating, it reflects the transformation demand of equipment management concept from "passive maintenance" to "active prevention". In the future, combined with digital technology and fine operation and maintenance, the systemic risk caused by hydraulic oil overheating is expected to be reduced by more than 70%, providing double protection for engineering efficiency and equipment life.