The oil bath air filter removes some of the dust from the dusty air entering the oil tank, which is further filtered through the filter element. The oil droplets and trapped dust return to the oil tank together, ultimately completing the filter's filtration.

Working principle of oil bath air filter
The oil bath air filter is divided into upper and lower shells. The upper shell contains components such as a metal wire wound filter screen, while the lower shell contains an oil pool, which contains a certain amount of engine oil.
The working principle of the filter is: air enters the air filter housing from the intake port, rushes towards the surface of the oil along the intake pipe, changes direction, and reaches the outlet through the filter screen.
After the air enters the intake, some of the dust in the dusty air is adhered to by oil, while another part of the dust collides with the oil surface with the airflow, producing oil mist. As the engine continues to run, oil mist gradually forms oil droplets and falls, washing away the dust adhering to the metal mesh, forming a circulation of oil flow and forming an oil bath phenomenon, enhancing the filtration effect.

Oil bath air filter maintenance
On forklifts, oil bath air filters cannot be used alone, and together with dry air filters, form an intake filtration system with secondary filtration function.
When using an oil bath air filter, it is necessary to maintain the specified oil level height to prevent oil loss during operation. Generally, filters do not require additional oil during the second maintenance period, unless the oil is sucked into the engine. Pay attention to regularly checking the changes in oil level and quality. When the dust in the oil pool exceeds half of the depth of the oil pool or the viscosity of the oil increases, it is necessary to clean and replace the oil in a timely manner.
The oil bath air filter is sensitive to inclination, and the installation inclination angle of the air filter after maintenance should be less than 30 °. Excessive tilt angle may reduce the filtering efficiency of the filter and even cause the oil to be sucked into the engine. Compared to dry air filters, oil bath air filters require more frequent maintenance.