The CASE 521E XR is a high-performance articulated wheel loader designed for demanding construction and material handling applications. Powered by a turbocharged 4-cylinder 445TA/EGE engine with 274 cu in displacement, it delivers 129 hp (96 kW) gross power and 118 hp (88 kW) net power at 1800 rpm, with peak torque at 1300 rpm and a 19% torque rise for responsive operation. The loader features a robust hydraulic system with a 35.4 gal/min (132 l/min) pump flow, 3625 psi relief valve setting, and fast cycle times—5.6 sec raise, 2.7 sec lower, and 1.1 sec dump. It has a 2.2 cu yd (2 m³) heaped bucket capacity, 1.8 cu yd (1 m³) struck, and an 8.4 ft (2 m) bucket width, providing excellent reach and dump clearance at maximum lift. The machine’s dimensions include a 22.9 ft (7 m) length with bucket on ground, 10.8 ft (3 m) cab height, 13.1 ft (4 m) hinge pin max height, and 8.2 ft (2 m) width over tires. With a 9.1 ft (3 m) wheelbase and 16.4 ft (5 m) turning radius, it offers maneuverability in tight spaces. The 521E XR operates at 24 volts, has a 50 gal (189 l) fuel tank, and a 23,442 lb (10,633 kg) operating weight. It is equipped with 17.5 x 25 L3 tires, a 4-speed forward and 3-speed reverse transmission, and a 24° rear axle oscillation for stability. The loader also features a 15,819 lb (7,176 kg) static tipping weight and a 1.3 ft (0 m) ground clearance, making it suitable for a wide range of job site conditions.