310E - BACKHOE, LOADER 21 MAIN HYDRAULIC SYSTEM Parts group 21 MAIN HYDRAULIC SYSTEM 2160 HYDRAULIC SYSTEM . Hydraulic Oil Filter Main Hydraulic System Main Hydraulic System Main Hydraulic System Reservoir Hydraulic Oil Cooler and Hoses (With Air Conditioning) (High Ambient) Hydraulic And Transmission Oil Coolers (With And Without Air Conditioning) Main Hydraulic Pump Main Hydraulic Pump Ride Control Select group 21 MAIN HYDRAULIC SYSTEM John Deere: 2160 HYDRAULIC SYSTEM