The John Deere 120D is a mid-size hydraulic excavator powered by a Tier III certified 4045H turbocharged engine delivering 93 net horsepower at 2,000 rpm, with a displacement of 276 cubic inches. This compact machine features an operating weight of 12,926 kg and exceptional digging capabilities with a maximum depth of 18.3 feet and reach of 27 feet along the ground, making it ideal for confined work spaces and precision excavation tasks. The hydraulic system operates at 4,980 psi with a combined pump flow capacity of 55.5 gpm, providing robust arm breakout force of 57.0 kN for demanding digging applications. The boom configuration offers flexible working heights, with maximum cutting heights ranging from 28.2 to 29.2 feet depending on arm length selection, and maximum loading heights of 20.3 to 21.3 feet. Equipped with a variable bucket capacity ranging from 0.5 to 1.1 cubic yards, the 120D accommodates diverse material handling requirements. The swing mechanism operates at 13.3 rpm with 34,000 Nm torque, enabling efficient repositioning on job sites. The undercarriage features 44 shoes per side with a 23.7-inch shoe size and 6.5-foot track gauge, generating ground pressure of only 5.4 psi for minimal surface disturbance. With a maximum travel speed of 3.5 mph and drawbar pull of 24,729 pounds, the 120D combines mobility with substantial pulling power. The 66.1-gallon fuel capacity supports extended operating periods, while the 35.1-gallon hydraulic system fluid capacity ensures reliable performance in various working conditions.