Gear pumps are mechanical hydraulic pumps that deliver constant oil flow using external gear technology, commonly used in fluid power systems. This category comprises Parker Hannifin PGP series external gear pumps, including PGP502, PGP511, PGP517 and PGP620. Parker PGP gear pumps are engineered for fixed displacement duty with defined operating pressures, speeds and connection standards. Units are supplied with standardized mounting interfaces, shaft designs and housing options to support system integration. Original Parker components are provided with technical guidance and global express logistics.