344K - LOADER, FOUR-WHEEL DRIVE 21 Vehicle Main Hydraulic System Parts group 21 Vehicle Main Hydraulic System 2161 Hydraulic Pumps And Drives . Hydrostatic Tandem Pump With Fittings Hydrostatic Pump Assembly Valve Regulator Pressure Regulating Valve Internal Gear Pump Forward / Reverse Solenoid Valve Hydrostatic Pump Splined Coupling and Flange 2163 Hydraulic Lines and Hoses . Pilot Accumulator, Hydraulic Hoses and Fittings Engine Cooling Fan Lines 2164 Hydraulic Reservoir, Filter and Cooler . Hydraulic Oil Reservoir Hydraulic Filter Select group 21 Vehicle Main Hydraulic System John Deere: 2161 Hydraulic Pumps And Drives 2163 Hydraulic Lines and Hoses 2164 Hydraulic Reservoir, Filter and Cooler