8 Impacts caused by oil source failure of hydraulic universal test

There is oil leakage at the joints of each oil pipe of the hydraulic universal test machine, the viscosity of the hydraulic oil is low, dirt is blocked in the oil supply valve, air exists in the oil passage, and the oil supply valve, and the piston of the overflow valve is overturned or installed in reverse. The following 8 situations may occur
1. During loading test, it stops and stops
2. Numbers repeatedly jump during the test (not due to sample deformation or reaching the yield point)
3. Pointer stirs when loading
4. The swing rod back-return buffer fails
5. Swing rod backward hysteresis
6. The pointer back to zero process is unstable
7. When the working piston floats out of no load, the pointer swings or indicates a certain force value.
8. The working piston will be unloaded after it rises and cannot be freely lowered.