The CASE 521E is a medium-sized articulated wheel loader designed for high productivity in construction, agriculture, and material handling applications. Powered by a turbocharged Case 445TA/EGE Tier 3 engine, this four-cylinder unit delivers 129 hp (96 kW) gross power and 118 hp (88 kW) net power at 1800 rpm, with a torque rise of 19% and peak torque at 1300 rpm. The loader features a robust hydraulic system with a pump flow capacity of 35.4 gal/min (132 l/min), enabling fast cycle times: 5.6 seconds to raise, 2.7 seconds to lower, and 1.1 seconds to dump. The operating weight is 23,069 lbs (10,464 kg), with a static tipping weight of 18,620 lbs (8,446 kg). The loader is equipped with a Z-bar or XT tool carrier linkage, offering high breakout force and excellent visibility. Bucket capacity ranges from 1.8 cu yds (struck) to 2.2 cu yds (heaped), with a width of 8.4 ft (2 m) and a dump clearance of 9.1 ft (3 m) at maximum raise. The machine has a hinge pin height of 11.9 ft (3 m), a wheelbase of 9.1 ft (3 m), and a turning radius of 16.4 ft (5 m). Transmission options include four forward and three reverse gears, with a maximum forward speed of 22.3 mph (35 kph) and reverse speed of 14.1 mph (23 kph). The 521E also features selectable power curves and work modes for optimized fuel efficiency and performance, along with a comfortable, isolation-mounted cab and advanced operator adjustments.