Hydraulic gear pumps with external gearing are used for pressurized supply of oil medium to the hydraulic system, or just pumping and filtering oil. The hydraulic gear pump can be in different sizes with the required oil flow of 1.4-13.8 ccm/rev, according to the customer's wishes. These hydraulic pumps with external gearing work with a continuous pressure of up to 250 bar. GHP 1 - D - 6 Marzocchi gear pump