High pressure gear pump is one of the essential components of hydraulic system. This is also the reason why maintenance of hydraulic system components has become increasingly important, with the aim of reducing failures and increasing the service life of hydraulic systems. 80% of common malfunctions are caused by incorrect working conditions and maintenance.With the development of technology, the working efficiency of hydraulic pumps continues to improve, and their service life is also constantly shortening. The knowledge of users in hydraulic systems, usage experience, and operational choices (oil, usage methods, or non filter) can indeed affect the working life of hydraulic pumps. Hydraulic pumps do not suddenly malfunction, but they typically fail due to overheating, ripple pressure, flow loss, and other reasons. The following simple specifications can prevent these faults from occurring. In hydraulic systems, all equipment should be compatible and compatible with each other. (Cylinder, pump, power take-off, valve, flow limiting valve, fuel tank, hose, accessories, etc.)2. Select the appropriate pump model (gear pump, piston pump, bent shaft pump) based on the purpose of the vehicle's upper structure, ensuring that its performance values (pressure and flow) are correct.3. Determine sufficient types of connecting flanges. (UNI, ISO, SAE, Shaft, etc.)4. The rotation of the pump should be determined based on the rotation of the stimulating components used as power take-off and electric motor.5. All hoses and fittings in the hydraulic system should have the same size as the inlet and outlet fittings specified in the pump catalog. Even if the pump inlet joint is suitable, the diameter of the feed line should not be narrower than the specified one.6. When installing pump power components (electric motors, power take-off, etc.), there is no need to emphasize appearance. The nuts should be fully tightened and balanced, and the connection of hoses should be handled flexibly.