The Case 621E XR is a mid-sized articulated wheel loader powered by a Case Family IV 667TA/EDB Tier III certified turbocharged diesel engine with 6 cylinders, delivering 146 net horsepower at 1800 rpm and 508 lb-ft of torque at 1300 rpm with 33% torque rise. The machine features a 4-forward/3-reverse proportional transmission with electronic control module, torque sensing autoshift, and manual shift capability, enabling a maximum forward speed of 24 mph and reverse speed of 15.6 mph. The hydraulic system utilizes a closed-centered pressure/flow compensated pump with 45.2 gallons per minute capacity and 3600 psi relief setting, delivering rapid cycle times: 6.3 seconds raise, 1.3 seconds dump, and 4.7 seconds lower. The 2.5-3.0 cubic yard general-purpose bucket provides 23,925 lbs of breakout force and 10.6 feet dump clearance at maximum raise. Operating at 27,604 lbs, the loader features external planetary axles, limited-slip differentials, and hydraulic wet disc brakes with spring-applied parking brake and limp-home mode. Dimensionally, the unit measures 25.6 feet in length, 8.3 feet width over tires, and 11.2 feet to cab top with 16.9-foot turning radius. Standard equipment includes a ROPS/FOPS enclosed cab with air conditioning, automatic height control, positive float lock, and automatic return-to-dig position. The 65-gallon fuel capacity supports extended operational intervals with 24-volt electrical system and 65-amp alternator.