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Fault 1: Unstable hydraulic pressure or inability to generate pressure properly in the pressure calibrator. Causes: 1. Insufficient oil level in the tank. 2. Damage to the pipeline connections during transportation caused leakage. 3. The sealing ring of the quick-connect fitting in the “○” shape is damaged. 4. There is too much air in the system or it has not been completely removed. Pressure calibrator handling method: 1. Loosen the fuel tank cap or refill the fuel tank. 2. Tighten the pipeline connections. 3. Replace the “○” ring. 4. Pump the oil filling pump repeatedly to expel the air in the system along with the oil. Solution: It is necessary to determine whether the instrument is operating under normal atmospheric pressure based on the actual local atmospheric pressure; if pressure cannot be generated, it may feel as though there is air compression in the pressure generation pump. Fault 2: The negative pressure generated by the pressure calibrator does not meet the standard. Reasons: 1. The directional valve does not switch properly, resulting in air leakage. 2. The positive pressure check valve or negative pressure check valve fails to return to its original position after moving, resulting in air compression. Procedure for using the pressure calibrator: 1. The directional valve must be switched to its correct position; the valve stem must not remain suspended in mid-air. 2. Check whether the seat holes of the positive pressure and negative pressure check valves meet the requirements. 3. The spring is severely tilted, preventing the check valve spool from sliding freely. For more information, please visit the company’s official website at http://www.yb1518.com/. Please retain this link when reproducing the content! http://www.yb1518.com/UploadFiles/2017413155219276.jpg