The position of the dust outlet should be at the lowest part of the filter, so as to ensure that the particulate matter and a small amount of rainwater can be completely discharged (the waterproofing of the air inlet cap and the air inlet intermediate interface should not be sloppy). When the rubber of the dust port loses its elasticity and cannot be closed, when the inside of the filter is under negative pressure, the air enters the filter from the dust discharge valve. Under the action of the internal and external pressure difference, not only the unfiltered air will directly enter the air filter element, but also the filtered dust cannot be discharged, resulting in a greatly reduced filtering effect and service life of the air filter. Operation in rainy days or in environments with high air humidity will cause the separated dust to condense with moisture and accumulate at the outlet of the dust discharge valve, so that the dust cannot be removed smoothly. You can often clean the dust discharge port and dust discharge channel to see if there is any poor dust discharge. Happening.
 

The filter paper of the safety filter element has high permeability, low resistance and low filtration efficiency. It is not allowed to start the engine when only the safety filter element is installed. The safety filter element does not need maintenance and cleaning, and the safety filter element is not allowed to be removed during maintenance. To prevent dust from entering the air intake (even if it is shut down). If dust is found on the safety filter element, it is most likely that the main filter element is damaged, and the main filter element and safety filter element should be replaced immediately. Of course, when the main filter element is cleaned and dust falls on the safety filter element, the safety filter element can be removed for cleaning. You can keep a safety filter that was replaced before. At this time, you can temporarily install it and replace it after cleaning.