The Case 621C XT wheel loader features a turbocharged 6T-590 engine with a displacement of 359.1 cubic inches, delivering a gross power of 139.5 hp (104 kW) and a net power of 130.1 hp (97 kW) at 2000 rpm. It provides a torque of 424.8 lb-ft at 1400 rpm with a 31% torque rise, supporting heavy-duty operations. The machine's operating weight is approximately 28,810 lbs (13,068 kg), with a fuel capacity of 51 gallons (193 liters). The loader is equipped with a bucket offering a heaped capacity of 2.4 cubic yards (2 m³) and a struck capacity of 2 cubic yards (2 m³), with a breakout force of 27,809 lbs (12,614 kg), making it well-suited for robust material handling. The bucket width spans 8.4 ft (2 m). Key dimensions include a ground clearance of 1.4 ft (0.4 m), height to the top of the cab at 10.7 ft (3.3 m), hinge pin max height of 12.7 ft (3.9 m), a wheelbase of 9.6 ft (2.9 m), and width over tires at around 8 ft (2.4 m). It features 20.5 R25 tires and a turning radius of 17.1 ft (5.2 m). The hydraulic system has a pump flow capacity of 61.6 gallons per minute (231 l/min), with operating times of 1.7 seconds dump, 4.4 seconds lower, and 5.4 seconds raise. The wheel loader uses a 4-speed forward and 3-speed reverse mechanical transmission with electronic control. Fluid capacities include 40.5 gallons hydraulic fluid, 4 gallons engine oil, and 6.9 gallons cooling fluid. Electrical supply is 12V with a 65A alternator.