The WA313-8222-100 is a power take off hydraulic pump drive gear built for the 50/51 Series PTO line. This gear transfers rotational power from the PTO unit to a mounted hydraulic pump, keeping the drive train engaged when auxiliary hydraulic functions are running.Interchanges:MA-1688-22Features50/51 Series PTO hydraulic pump drive gearManufacturer part number WA313-8222-100Designed to drive a mounted hydraulic pump from a PTO unit