... . Sauer PV of PV20,PV21,PV22,PV23,PV24 hydraulic axial variable displacement piston pump1. Heavy duty hydraulic piston pump2. Completely interchangeable ... , aviation and transport machinery etc.4. The hydrostatic hydraulic transmission drive in close system, consisting of SAUER PV20/21/22/23 ... : Sauer PV of PV20,PV21,PV22,PV23,PV24 hydraulic axial variable displacement piston pump