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The high-temperature gear oil pump is used for the transportation and pressurization of media such as residual oil, coal tar, spilled oil, foam raw materials, and additives. It is an ideal pumping and pressurization equipment for the glass, foam, building materials, chemical construction, petroleum, and grain and oil industries. The high-temperature gear oil pump consists of components such as gears, shafts, pump body, pump cover, and shaft end seals. All parts are made from suitable temperature-resistant materials. The moving parts inside the pump are lubricated by the medium it pumps. The high-temperature gear oil pump is suitable for pumping high-temperature liquids that contain no solid particles or fibers and are non-corrosive. The medium temperature can reach up to 250°C, with a viscosity ranging from 5 to 1500 cSt. Measures to extend the service life of high-temperature pumps: 1. Since the pump operates at high temperatures, hinge supports should be installed on the piping during installation in a cold state to prevent the piping from shifting as the temperature rises. 2. The coupling must be thermally aligned after the pump body has been heated up, to prevent the generation of additional torque during operation. 3. An interlock stop alarm must be installed at the outlet pressure measurement point of the CQB-G high-temperature magnetic pump. Otherwise, if the discharge pipeline becomes blocked, it may easily lead to damage to the pump body. 4. When starting the pump, do not blindly increase the speed when no pressure has been built up at the outlet, to prevent premature damage to the shaft or bearings. 5. When cleaning the pipette, do not use the pump to deliver the cleaning solution. Instead, remove the internal components and reinstall them after the pipetting is completed, to prevent foreign substances from getting into the pump. 6. The temperature of the heat medium jacket in the pump body can be slightly lower than that of the heat media in the front and rear jackets. Since the melt viscosity decreases as the shear rate increases, the compression by the gears and the shear forces from the bearings cause the melt temperature to rise by 3–5°C after passing through the pump; reducing the temperature of the heat transfer medium can prevent degradation of the melt. Data shows that by reducing the temperature in the bearing area, it is possible to **increase the load-bearing capacity of the bearings; there is no need to replace pumps with higher capacity. By simply increasing the rotational speed, the output capacity of gear pumps can be increased by 50%. Common faults of gear oil pumps and their corresponding solutions are as follows: (1) Fault symptom: The pump fails to discharge fluid. Causes: a. Opposite rotation direction; b. Inlet or outlet valves are closed; c. No fluid at the inlet or insufficient pressure; d. Excessively high viscosity, preventing the pump from gripping the fluid. Solutions: a. Verify the rotation direction; b. Check whether the valves are closed; c. Inspect the valves and pressure gauge; d. Check the fluid viscosity to see if flow occurs at a low speed proportional to the rotational speed; if there is flow, it indicates insufficient inflow. (2) Fault symptom: Insufficient pump flow. Causes: a. Inlet or outlet valves are closed; b. Low inlet pressure; c. Clogged outlet pipeline; d. Leakage in the packing box; e. Too low rotational speed. Solutions: a. Check whether the valves are closed; b. Verify that the valves are open; c. Confirm that the discharge volume is normal; d. Tighten any loose connections; if there is severe leakage that affects production, stop the pump and disassemble it for inspection; e. Check the actual rotational speed of the pump shaft. (3) Fault symptom: Abnormal noises. Causes: a. Large eccentricity of the coupling or poor lubrication; b. Motor failure; c. Abnormalities in the reducer ； d. Poor installation at the shaft seal ； e. Countermeasures for shaft deformation or wear ； a. Align or fill with grease ； b. Check the motor; c. Check the bearings and gears; d. Check the shaft seal ； e. Parking disassembly inspection (4) Fault symptom: Excessive current.