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Filter PL420 can't replace filters PL421

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Maintenance knowledge about fuel water separator

Maintenance knowledge about fuel water separator

One: start inspection and preparation 1: Before using the water separator equipment, the driver's consent should be obtained. 2: Check the line installation of the fuel water separator, whether the steering of the supporting pump is normal 3: Water is supplied to the fuel water separator, and the top air valve is opened to allow air to escape. 4: Check the oil and water separation in the marrow water inlet and outlet system without any leakage Two: precautions during operation 1: Adjust the drain valve opening degree and keep the pressure inside the separator to facilitate the elimination of the oil in the separator. 2: Observe whether the gauges such as pressure gauges and thermometers are normal. 3: Observe the working condition of the treated drainage water quality and oil concentration alarm 4: After the discharge is over, it should continue to be poured into clean water for 15 minutes to clean the separator. 5: Close the inlet and outlet after the pump is stopped, avoid the loss of clean water in the cylinder, reduce the oxidation and corrosion of the inner wall. 6: Each time the fuel water separator is used for discharge, it should be recorded in the oil beauty record book. Three: maintenance 1: Regularly clean the filter, open the bottom of the separator to vent, and remove the sediment deposited in the lower part, impurities 2: Clean the internal separation components of the separator in time, and avoid cleaning the inner wall and components of the separator with a cleaning agent. 3: When a fault occurs, the cause should be identified and the failed coalescing component should be replaced in time.

Filter PL420 can't replace filters PL421
2019-06-21

In the past, the PL420 was used as the first primary filter for the fuel tank girders. There is no pressure. The common rail is pressurized, and the PL420 is under negative pressure.


Before the appearance of the electronic pressure pump, the transparent cup is very safe, there is no pressure damage to the transparent cup, but with the advent of the electronic pressure pump, the engine's two coarse filters change from negative pressure to 4 positive pressures or even greater pressure. The old-fashioned PL420 transparent cup has the risk of oil leakage.


Some OEMs changed the PL420 on the engine to the PL421 without a cup. However, some OEMs did not consider this problem. They still loaded the PL420. (There are now Delong) there are design risks.


It is recommended to use the filter PL421 for models equipped with an electronic pump.


Filters PL420 and PL421, we can provide, if you need, please feel free to contact us.


Filters PL420 and PL421

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