The MOOG D954-2065/F is a hydraulic pump. It's a Moog Radial Piston Pump (RKP), a high-performance, variable displacement pump. RKP pumps are durable, and quiet, and have served the industrial market for over three decades. Model HPR18A1RKP063TM35H1Z00 Moog 0 514 700 139 Applications PressesMachines for processing plasticMachine tools that clamp hydraulics How it works An eccentric shaft pushes radially positioned pistons outward to provide flow.When the pistons are drawn backward, a valve insides the piston opens to allow new fluid into the piston.The valve also stops the pressurized fluid from returning into the piston cavity. Fluid temperature The fluid temperature in the tank should not exceed the temperature of the pump by more than +25 °C (+77 °F).