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　　Before operation of vacuum oil filter:

　　1. Open the electrical box, check whether all electrical components are complete, whether they are loose or wet, and remove sundries.

　　2. Check whether the rotation direction of the motor is correct, and it shall conform to the direction of the indicating arrow.

　　3. Check whether the bolts and nuts of all parts of the machine are loose, and observe whether the vacuum pump oil window and vacuum oil reach the oil mark.

　　4. Connect the main power supply and ground wire.

　　5. Close the drain valve of the cooler, check whether the hose joints are loose, and connect the inlet and outlet oil pipes.

　　6. Check whether the primary filter and fine filter are installed properly.

　　7. Close all valves.

　　Note during operation of vacuum oil filter:

　　1. The working temperature of vacuum pump shall not exceed 75 ℃

　　2. The temperature of all motors shall not be higher than 60 ℃ under the condition of no abnormal noise.

　　3. Pay attention to observe the pressure gauge. If the pressure gauge exceeds the specified value, stop the machine and clean the filter screen.

　　4. If the oil intake is too small, check whether the primary filter and filter screen are blocked. If they are blocked, clean them with kerosene and continue to use them.

　　Causes of excessive pressure of vacuum oil filter and treatment methods:

　　Causes

　　1. There is too much water vapor in the exhaust gas of the vacuum pump with water in the filtered oil.

　　2. Because the altitude difference of the place of use does not affect the change of vacuum degree under the condition of standard atmospheric pressure.

　　3. Low vacuum oil level line in vacuum pump.

　　4. Water content of vacuum oil due to long service time.

　　5. There is air leakage at each connection.

　　6. Wearing parts of vacuum pump are worn.

　　Elimination method

　　1. It is a normal phenomenon and needs to be filtered many times.

　　2. It is normal to raise the temperature of oil, so that the water can evaporate.

　　3. Add vacuum pump.

　　4. The oil needs to be replaced.

　　5. Inspection and maintenance;

　　6. Replace vulnerable parts.

　　Other problems of vacuum oil filter:

　　1. The oil outlet pipe of the machine is too long, the delivery oil level is too high, and the oil outlet diameter is small or the pipe is too small.

　　2. There are many impurities in the oil filter.

　　Elimination method

　　1. Change the working environment.

　　2. Replace the filter paper or clean the filter element.

　　Vacuum pump start fuel injection

　　Causes

　　1. The filtered oil has a lot of water content, the oil float rises and is sucked into the vacuum pump, and the oil level of the vacuum pump rises.

　　2. The gasket in the vacuum pump is displaced or damaged.

　　Elimination method

　　1. The vacuum oil shall not be higher than the oil level line.

　　2. Maintenance.

　　Causes of insufficient oil output due to no pressure of oil drain pump:

　　1. The primary filter net is blocked;

　　2. Oil seal of oil drain pump leaks air;

　　3. The oil inlet pipe is blocked and the suction cylinder bottom;

　　4. The oil suction pipe is too thin or the suction head is too deep;

　　5. The injection hole in the vacuum cylinder is blocked.

　　Solution:

　　1. Clean the closed network.

　　2. Adjust the oil seal gland, if there is no need to change the oil seal.

　　3. Charlie.

　　4. Improve the environment.

　　5. Disassemble and wash.