The Caterpillar 904B is a compact wheel loader engineered for versatility and efficiency in demanding environments. It features a turbocharged MHI S4Q2 engine delivering 52 hp (39 kW) net power, ensuring reliable performance. The loader’s operating weight is 9,810 lbs (4,450 kg), with a rated bucket capacity of 0.8 cu yds (0.6 m³) and a bucket width of 5.9 ft (2 m). Breakout force reaches 8,003 lbs (3,630 kg), while hydraulic lift capacity is 7,464 lbs (3,386 kg). The machine is equipped with a closed-loop, two-speed hydrostatic single-path transmission, enabling smooth operation and a maximum travel speed of 12 mph (19 kph) in both forward and reverse. The fixed front axle and oscillating rear axle, with planetary gear reduction final drives, provide stability and maneuverability. The loader meets ROPS and FOPS safety standards (SAE J1040 MAY94, ISO 3471-1:1986, SAE J1231 JAN81, ISO 3449:1992), and its oil-immersed drop box combines service and parking brakes, meeting ISO 3450:1996. Key dimensions include a length with bucket on ground of 17.5 ft (5 m), a width over tires of 5.9 ft (2 m), and a height to the top of the cab of 7.9 ft (2 m). The hydraulic system offers a pump flow capacity of 22 gal/min (83 l/min) and a main relief setting of 3,002 psi. The loader’s dump clearance at max raise is 7.8 ft (2 m), and it features a 22-gal (83 l) fuel tank. The 904B is designed for ease of maintenance, with accessible service points and a robust build for heavy-duty applications.