1 Pump damage, sliding shoe damage or ski and column ball joint seal damage; Swash plate wear; Plunger and cylinder hole wear; Variable mechanism failure; Oil distribution plate wear or cylinder oil distribution end face wear; Pump LS valve wear, pressure block valve wear, constant power valve wear. Solution: Replace the pump.
2 pressure true and false judgment. There is actual pressure, but it is not displayed. The pressure gauge switch is not turned on. Turn on the pressure gauge switch. A large number of pressure gauges show lower pressure, change the range of suitable pressure gauges. If the pressure gauge is damaged, replace the pressure gauge.
3 The motor steering is not correct to change the motor steering, the pump steering is not correct, oil cannot be sucked, and the system has no pressure. Motor steering wrong, some hydraulic system will cause damage to the pump. Therefore, before starting the new pump, the correct steering of the pump should be clarified, and the pump shaft should be climbed by hand to fill the suction pipe of the pump with oil. Between the inlet and outlet of the pump, a single reverse short-circuit valve with appropriate diameter is connected.
The hydraulic cylinder has been used for a long time and may leak or string cavities.
5 The pressure regulating valve adjusts the pressure range of the hydraulic press. If it fails, it will also cause pressure reduction.
6 four-column hydraulic pressIf the pressure relief valve is broken, there will be a pressure drop.
7 The oil inlet valve leaks, causing the upper chamber oil to flow back.
8 hydraulic check valve wear, reverse leakage pressure drop.
Solution: replace the pump; check the oil level and replenish the oil; check the oil inlet and outlet pipes for leakage. If there is any leakage, it should be eliminated.