The maintenance of the control system of the hydraulic universal testing machine needs to be approached from three aspects: hydraulic, electronic, and mechanical, to ensure equipment accuracy and service life: 1. Hydraulic system maintenance: Regularly check the cleanliness of hydraulic oil, and ensure that the oil contamination level is below NAS level 8. It is recommended to replace it every 12 months or after 2000 hours of operation, with a filtration accuracy of not less than 10 μ m. Focus on the inspection of oil pump, valve group and pipeline interface. If the oil is turbid, foam increases or abnormal temperature rises (oil temperature>60 ℃) are found, shut down for maintenance immediately. Regularly clean the fuel tank respirator to prevent dust from entering and contaminating the oil. 2. Maintenance of electronic measurement and control system: Sensors are the precision core, and force sensors need to be calibrated by measuring institutions every year. Displacement encoders need to be checked for secure cable connections to avoid signal interference. The controller host should clean the internal dust every quarter to ensure the normal operation of the cooling fan and prevent components from overheating and aging due to dust accumulation. The software system needs to regularly backup test data, close non essential background programs, and avoid system lag. If there is an abnormal sensor signal, priority should be given to checking whether the wiring terminals are loose, and then gradually inspecting the amplifier board and analog-to-digital converter. 3. Mechanical structure maintenance: Lithium based grease should be applied to the ball screw and guide rail every two weeks. If there is any abnormal noise or jamming during operation, the parallelism of the guide rail and the coaxiality of the screw should be checked. Regularly tighten the bolts of the servo motor and reducer coupling to avoid a decrease in transmission accuracy caused by vibration. Clean the metal debris from the jaws and workbench promptly after each test to prevent corrosion from affecting the clamping force. 4. Environmental and safety management: The equipment should be placed in a clean environment with a temperature of 15-25 ℃ and humidity of ≤ 60%. The power supply should be equipped with a voltage regulator (fluctuation ≤ ± 10%). When shutting down for a long time, the piston should be lowered to the bottom of the oil cylinder, the power should be disconnected, and a dust cover should be covered. Maintenance records should provide detailed records of maintenance time, replacement parts, and calibration data to provide a basis for preventive maintenance. Through periodic and refined maintenance, the failure rate of the control system can be effectively reduced, ensuring the accuracy of test data and the stability of equipment operation.