Maintenance procedures for mini excavators' dry air filters

  • The engine's performance and longevity are greatly influenced by the air filter. Good daily maintenance of the air filter can not only effectively prevent abnormal wear of the engine, but it can also effectively extend the life of the engine and air filter as a result of its effectiveness. Its usefulness is determined by the number of hours spent on the job. A brief introduction to the classification and structure of air filters, as well as the cleaning frequency and cleaning methods, as well as the proper replacement and installation methods of dry air filters for small excavators, is provided, and potential maintenance misunderstandings and misunderstandings are identified and discussed. And put forth the most appropriate and effective methods of maintenance. It is critical for the engine's air intake system to have a clean air filter hydraulic breaker. As a result, it is capable of separating dust that enters engine air to the greatest extent possible, which helps to reduce early wear on engine cylinders, pistons, and piston rings in the process. A malfunctioning air filter will result in an insufficient amount of air being drawn into the engine, insufficient combustion, a reduction in power, black smoke, or even scrapping. However, this will not only have an impact on the engine's power and efficiency, but it will also have an impact on the environment. Emissions from engines pollute the atmosphere. It is therefore critical to perform regular inspections and maintenance on the air filter in order to ensure the stable and dependable operation of the engine and, ultimately, the dependable operation of the entire machine.

    1 An overview of the air filter

    According to whether or not the air is oiled, the air filters that are commonly used on diesel engines can be classified as dry or wet. Wet air filters are currently used in agricultural machinery and small and medium-sized mining machinery due to the limitations of their own use; however, dry air filters are gradually replacing wet air filters in construction machinery such as small excavators, particularly in China. The rotating dust-collecting dry dual-core air filters used by the majority of small excavator manufacturers are the most common type. Most of this article is devoted to explaining the most common maintenance misunderstandings and the proper maintenance methods for rotating dust-collecting dry dual-core air filters for small excavators (also referred to as dry air filters).

    1) The dry air filter's composition

    There are several parts to the dry air filter, including a shell, a safety filter element (also known as an inner filter element), a main filter element (also known as an outer filter element), a dust exhaust valve, and an end cover. It is common to use hydraulic breaker for mini excavator dry air filters because of their many advantages, including ease of installation, high filtration efficiency, large ash holding capacity, low environmental pollution, and ease of maintenance.

    2) Dry air filter operation principle

    Pre-filter device (located between the housing and the main filter element) for the dry air filter, which can cause air entering the air filter to generate a swirling flow, which, due to the action of centrifugal force, will separate heavier dust particles from the intake air and collect them in the dust valve. The high-performance dry air filter has a pre-filtering capacity of more than 85% and allows less than 15% of the dust to pass through to the second-stage filter area (main filter element). Under normal operating conditions, the filtration efficiency of the main filter element can reach as high as normal. Or greater than 99.9%In addition to the main filter element, there is a first-level safety filter element within it. If everything goes according to plan, the pre-filter and the main filter element will complete the dry air filter's dust filtering function. Only when the main filter element is not properly maintained, poorly sealed, or damaged does the safety filter element fail. The engine can be protected by using a safety filter if necessary. When compared to the main filter element, the safety filter element has a higher permeability, a lower flow resistance, and a lower filtration efficiency than the primary filter element. It will have no effect on the overall filtration efficiency and will only provide a protective layer of defense. As a result, starting the engine with only the safety filter best mini excavator element installed is not permitted.

    2 Misconceptions about dry air filter maintenance, as well as the proper maintenance methods

    It is common for people to overlook the importance of daily maintenance on the dry air filter, which has a significant impact on the engine's life, power, and economy. Besides affecting the filtration efficiency and life of the air filter, this will also allow dust to enter the engine, resulting in wear and tear on the engine's internal parts. The following are some of the most common misconceptions about dry air filters, as well as the correct maintenance methods to use on a daily basis:

    1) How often should the dry air filter be cleaned? 2.

    Many users believe that cleaning the air filter on a regular basis will extend the service life of the filter element, but in reality, this is a common maintenance misconception. In addition, because dry air filters have an initial filtration efficiency of around 99.5%, the filtration efficiency of dry air filters will continue to improve over time as more and more dust adheres to the filter paper, ultimately reaching more than 99.99%.

    If the dry air filter is cleaned too frequently, the filtering capacity of the filter element will not be fully utilized, which will not only increase the amount of dust that enters the engine, but it will also increase the likelihood of filter element damage as the number of cleanings is increased. It is important to note that if the filter element becomes damaged and is not discovered in time, it will exacerbate engine wear and shorten the engine's life significantly. As a result, after the differential pressure alarm sounds, it is necessary to clean the dry air filter. This not only reduces the workload, but it also improves the engine's protection and saves money on operating expenses. According to calculations and experimental verification, the dust-holding capacity of the main filter element will be reduced by 20%-40% after each cleaning. Thus, as the frequency of cleaning increases, the dust holding capacity of the main filter element of the dry air filter will gradually diminish. When the main filter element has been cleaned up to six times, the dust-holding capacity of the filter element has been reduced to nearly nothing. If a new main filter element is not installed immediately, the resistance of the intake system will increase, which will have a negative impact on the engine's performance and fuel economy.

    2) Techniques for cleaning the primary filter element.

    Tapping the main filter element of a dry air filter is a common method of cleaning the filter element. In spite of the fact that this is a simple and convenient method, it is not only easy to cause damage to the main filter element, but it will also allow a significant amount of dust to enter the inner side of the main filter element, allowing dust to enter the engine. Cleansing should be done in the following manner:

    (1) First, carefully remove the main filter element from the camera. Then, using a soft brush, brush away any dust that has accumulated mini excavator supplier on its surface in the direction of the crease. Finally, gently tap the end surface of the main filter element to make any remaining dust fall off the main filter element. When performing the aforementioned operations, use a clean cloth or rubber plug to block both ends of the main filter element in order to prevent splashed dust from falling into the inner surface of the main filter element during the operation. You can also use compressed air or an air pump (the air pressure should not exceed 0.2-0.3 MPa to avoid damage to the filter paper) to blow air from the inside of the main filter element to blow away dust that has adhered to the outer surface of the main filter element (this will help prevent damage to the filter paper). When cleaning the main filter element, do not use any liquid. Prevent the liquid from sticking to the main filter element during the cleaning process; otherwise, the filter element will become clogged, increasing the air intake resistance.

    (2) Inspect the main filter element to see if it is damaged, whether the upper and lower end faces are not flat, whether the rubber sealing ring is damaged, or whether there is dust inside the main filter element. If such issues arise, the main filter element should be replaced as soon as possible, even if the replacement time has not yet expired.
    If the safety filter element is damaged, check it with a bright flashlight to make sure. At this time, do not disassemble the safety filter element for inspection. Immediately replace any safety filter elements that have been damaged.

    The shell and dust valve should be cleaned.

    The ash holding capacity of the dry air filter itself is made up of three components: the ash holding capacity of the main filter element, the ash holding capacity of the shell, and the amount of dust discharged through the dust exhaust valve mini excavator supplier​ (if applicable). As a result, the overall dust holding capacity of a dry air filter will be significantly reduced if the filter housing is not cleaned at the same time the filter element is cleaned or if the dust exhaust valve does not function properly. If only the main filter element is cleaned, and neither the air filter housing nor the dust exhaust valve is cleaned, the service life of this series of air filters will be significantly reduced. In order to properly clean the air filter housing, use a clean cloth to carefully clean the inner wall of the air filter housing, and then check to see if the dust exhaust valve is functioning properly. First, on rainy days or in an environment with extremely high air humidity, the dust separated by the air filter becomes damp and adheres to the port of the dust valve, preventing it from properly discharging dust. Second, on hot days or in an environment with extremely high air humidity, the dust separated by the air filter becomes dry and adheres to the port of the dust valve, causing it to properly discharge dust. Second, when the end cover of the air filter is installed, the dust exhaust valve is not vertically downward, resulting in the separated dust being unable to be eliminated smoothly. When cleaning the shell and main filter element of the air cleaner, make sure that the shell and dust exhaust valve are also cleaned in order to ensure smooth dust exhaust; when installing the air filter end cover, make sure that the dust exhaust valve is pointing downwards or deflected left and right. To ensure that the separated dust can be removed normally, the temperature should not be higher than 15 degrees.