6.5 Hydraulic station: Fault circumstance Cause Trouble-shooting methodThe system has no pressure, the pressure is insufficient, the flow is insufficient 1. Manual shutoff valve is not closed tight;2. Examine the rotation direction of motor to be correct or not; 3. The pressure of overflow valve is adjusted to be too low or fails4. Is there any smoke exhausting, is the internal leakage too great or not;5. Is the oil level normal or not, is the oil pump normal or not;6. Examine the system to have any external leakage or not; 7. Examine the flow adjustment valve to be normal or not;8. Examine the electricity to be normal or not; 1. Close tight the shutoff valve2. Adjust the operation direction3. Adjust the overflow valve, and repair or replace 4. Purge each element5. Add hydraulic oil, examine the oil pump6. Screw tight the connective screw of element7. Adjust the flow valve8. Adjust the electrical systemThe noise of oil pump is too big, the system vibrates, there is bubble in the oil, the oil is opal when serious, and system has no pressure 1. The oil level is low2. That is caused by suction void, and the pipe vibrates when serious3. The pump bracket or motor fixing bolt is not tight4. The riveting of plunger and slipper is loose, or the part in oil pump is damaged 1. Return oil to heighten the oil level2. Examine the oil pipe to have any air leakage or not, is the oil suction pipe orifice and pump oil-in blocked or not, and eliminate the cause after it is found3. Bolt tight the connective of element4.Riveting back on.,or replacethe partThe pressure retaining performance is lowered, the oil pump motor starts frequently 1. The shutoff valve is not closed tight2. There is varia at the sealing surface of magnetic ball valve 1. Close tight the shutoff valve, it that is not unavailable, it shall be dismantled for purging or repair 2. Start machine for many times to rinse off the varia External leakage of hydraulic oil from the hydraulic system 1. The screw that fastens the hydraulic element is not tight2. The seal loop is damaged or aged 1. Screw tight each screw or nut2. Replace the seal loop The working of oil pump exceeds its longest working time 1.The elastic cell of pressure controller is fatigued, or the flickering switch fails; 2. The overflow valve fails, the limit force of oil pressure system is too low;3. The pressure adjustment is too high; 1. Adjust the pressure again, if that is unavailable, it shall be repaired or replaced2. Adjust or purge the overflow valve, if that is unavailable, it shall be repaired or replaced 3. Adjust the overflow valve
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