The main parameter of the pressure testing machine is the large test force, that is, how much pressure the test object can withstand before it deforms or breaks. The pressure is usually expressed in kilograms, and the unit is Newton N, kilonew KN (also useful "kg KG, ton T , Kilopascal KP” to express).The test range is generally backward compatible with the large test force as the upper limit.The pressurizing device generally uses hydraulic pressure or pneumatic pressure.

　　1. The oil leakage of the system is serious, check the tightening joints

　　2. The oil viscosity is low, the oil viscosity must be adjusted

　　3. The belt driving the hydraulic pump slips or becomes loose due to oil and aging. Tighten the belt or replace the belt

　　4. There is dirt in the oil return valve, which makes the oil return valve core and valve port insufficiently sealed, and there is oil leakage in the oil return pipe during loading. The oil return valve should be cleaned.

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