Hydraulic oil filters are responsible for filtering the hydraulic oil from impurities in it. These hydraulic filters prevent impurities that cause the failure of the filtration process, which is due to about 75% of the reasons for its failure due to contamination and reduces the life of the equipment and also reduces the pressure of the hydraulic oil in the circuit. There are two methods for filtration of fluids using hydraulic filters. The first is to filter a portion of the oil coming out of the pump and is called the partial oil filtration circuit. As for the second method, hydraulic filters work to filter the entire oil and is called the total oil filtration circuit. Among the factors for choosing hydraulic oil filters are the type and number of particles in terms of their size and condition, as well as the speed of the liquid passing through the elements, as well as the pressure of the cycle, as well as the clearances and installation conditions.