Gear pump troubleshooting: Gear pumps are widely used in the machining of automotive hardened steel parts, especially in applications involving PCBN cutting tools and CNC wire EDM for spline hole processing. In certain scenarios, such as when the motor rotation direction needs to be changed quickly, it's essential to explore innovative design and development in China’s machinery products. The current status and challenges in micro-hole processing technology also require attention. Proper selection and maintenance of cutting fluids, along with rational choices of indexable milling cutters, are critical for efficient operations. The key technology of spindle speed, strengthening of the cutting edge, and advancements in CVD diamond dressing tools are all important areas of focus. China’s CNC machine tool industry is expected to experience a golden development period over the next 15 years. Tool manufacturers must continuously improve their processes, as seen in research conducted at the Chengdu Institute of Tools. Two projects involve identifying and integrating loading/unloading systems into machines, while others focus on self-bolt drilling rigs, three-axis CNC systems, PDM health "egg" solutions, and hydraulic pump gearboxes in Anhui forklifts. In addition, there is ongoing work on low-voltage electrical reliability, welding teaching reforms, and innovations from thinkers and practitioners. CB-B type gear pumps are commonly used in dump trucks and construction machinery. Below are common failure causes and troubleshooting methods for reference. 1. Causes of Vibration and Noise and Their Resolution (1) Air Ingestion ① The pump body and covers use hard seals that may not be flat enough, leading to air intake during operation. If the flatness is insufficient, grinding on a flat steel plate using an "8" shaped pattern with sandpaper or a surface grinder can help. Ensure the flatness does not exceed 5μm and maintain perpendicularity between the plane and the hole. ② If the oil seal is damaged or aged, replace it. ③ Low oil levels or improperly submerged suction nozzles can cause air ingestion. Add oil to the tank and ensure return pipes are below the oil level. ④ High pump installation above the oil surface may reduce suction efficiency. Adjust the height accordingly. ⑤ A clogged or undersized oil filter can increase suction resistance. Clean or replace the filter. (2) Mechanical Issues ① Misalignment between the pump and coupling can cause vibration. Adjust the coupling. ② Contaminated oil can damage internal components. Replace oil, clean the pump, and check for wear. ③ Worn gears or bearings can lead to noise. Repair or replace damaged parts. ④ Small assembly gaps or burrs can cause internal leakage. Increase axial clearance and remove burrs. (3) Other Factors High viscosity oil can also cause noise. Choose oil with the correct viscosity. 2. Insufficient Output Flow ① High oil temperature reduces viscosity and increases internal leakage. Check for seal damage. ② Incorrect oil viscosity can affect flow. Use qualified oil. ③ Reversing the pump can cause flow issues. Check the rotation direction. ④ Low engine speed reduces output. Identify and fix the issue. 3. Poor Rotation ① Excessive axial or radial clearance can cause poor rotation. Adjust and repair. ② Dirt inside the pump should be removed. ③ Assembly errors, such as incorrect pin placement, can prevent movement. Ensure proper alignment. ④ Coaxiality between the pump and engine should be within 0.1mm. ⑤ Undemagnetized parts can cause problems. Demagnetize all components before assembly. ⑥ Damaged needle sleeves or broken needles should be replaced. ⑦ Blocked oil outlets need to be cleared. 4. Overheating ① Poor rotation due to various reasons can cause overheating. Address the root cause. ② Incorrect oil viscosity can also lead to overheating. Choose the right oil. ③ Severe friction between side panels, bushings, and gears requires repair or replacement. ④ High ambient temperatures or poor cooling systems can cause heat. Improve cooling. 5. Main Parts Repair (1) Gears ① Tooth shape repair involves removing burrs and polishing. Replace severely worn gears. ② End face repair uses grinding and polishing. Ensure perpendicularity and parallelism within 5μm. ③ Exchange meshing positions to extend gear life. (2) Pump Body Wear on the cavity can be repaired by flipping symmetrical bodies or plating bronze on asymmetrical ones. (3) Bearing Race Worn bearing races can be polished or replaced. Maintain precision within 10μm. (4) Shafts Minor wear can be polished, while severe cases require chrome plating or rework. Ensure parallelism and symmetry meet specifications.

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