1. Most Common Fault: Oil Pump Motor Does Not Work
Troubleshooting Steps:
Step 1: Check if the power plug is securely inserted and if internal wiring is loose. Reconnect any loose wiring.
Step 2: Check if the microswitch is damaged. Replace it if necessary; if damaged, replace it directly.
Step 3: Measure if the motor capacitor is faulty. A bulging capacitor or insufficient capacity will prevent the motor from starting. Replace it with a capacitor of the same specification.
If the motor makes a humming sound but does not rotate after power is applied: Check if the hydraulic oil level is sufficient. If insufficient, add the same brand of hydraulic oil. After ruling out insufficient oil, check if the oil pump is stuck due to impurities. Disassemble and clean the impurities to repair.
2. Core Fault: Oil Pump Works but Cylinder Does Not Move
This is the most frequent fault on-site. Troubleshooting in the following order will quickly locate the problem:
Step 1: Check the hydraulic oil level. If insufficient, add oil to the rated level.
Step 2: Check the hydraulic pressure regulating valve. If it is too loose, insufficient pressure will prevent the cylinder from moving. Adjust the pressure clockwise to the standard pressure.
Step 3: Check the oil filter. A blockage will obstruct the oil flow. Remove and clean or replace the filter element to restore flow.
Step 4: Check the quick-connect fittings. Blockages or poor seals at the fittings will cause insufficient oil pressure. Clean or replace the fittings.
Step 5: Confirm that the pressure relief valve is closed. If the pressure relief valve is not closed, the entire oil circuit cannot build pressure. Closing it will allow normal operation.
3. Pressure Abnormalities: Unstable Pressure/Pressure Drop/Insufficient Pressure
If the pressure is still insufficient after adjustment: First, check for leaks in the hydraulic lines. Cracked oil pipes/aged seals causing leaks will lead to pressure loss. Replace the corresponding oil pipes or seals.
If there are large pressure fluctuations and frequent pressure drops: This is usually due to impurities stuck inside the relief valve. Disassemble the relief valve and clean the impurities to repair it. If the problem persists, replace the relief valve.
If the cylinder is crawling and vibrating: This is mostly due to air mixed in with the hydraulic oil. Open the oil circuit vent valve to release the air; also check for wear and internal leakage in the seals. If worn, replace the seals.
4. Oil Leakage Faults: Oil leakage at interfaces/high-pressure pipes.
Quick-connector oil leakage: This is usually due to aging and deformation of the interface gasket. Replacing the gasket with one of the same size will solve the problem.
High-pressure pipe body oil leakage and bulging: This indicates that the oil pipe is aging. It must be replaced directly with a new hydraulic oil pipe of the same pressure rating to avoid the risk of pipe bursting.
Cylinder end cap oil leakage: This is due to wear and aging of the cylinder seal ring. Disassembling and replacing the seal with one of the corresponding size will solve the problem.
