The Caterpillar 312D is a compact hydraulic excavator powered by a Cat C4.2 ACERT engine delivering 90 net horsepower and 67 kilowatts, engineered for high efficiency and low emissions compliance. Weighing 28,484 pounds with an operating ground pressure of 6.1 psi, this machine excels in confined spaces and soft ground applications. The excavator features a 259.4 cubic inch displacement engine with a fuel capacity of 66.1 gallons and operates with a 42.8-gallon hydraulic system fluid capacity, producing a maximum hydraulic pump flow of 33.6 gallons per minute at 5,076 psi relief pressure. The 312D offers three configurable boom and stick combinations, accommodating varying project requirements. Option 1 provides a maximum reach of 26.9 feet along the ground with a cutting height of 27.9 feet, while Option 3 extends reach to 28.3 feet and cutting height to 28.6 feet, with maximum digging depths reaching 19.9 feet. The swing mechanism operates at 12.4 rpm with swing torque of 30,950 Newton-meters. Equipped with 19.7-inch triple grouser shoes and a track gauge of 6.6 feet, the machine achieves a maximum travel speed of 3.5 mph and provides 25,628 pounds of drawbar pull for enhanced mobility. The bucket capacity ranges from 0.4 to 1.0 cubic yard, with a standard reference capacity of 0.7 cubic yards. Standing 9.1 feet tall to the cab top with a tail swing radius of 7.1 feet, the 312D maintains a compact transport profile measuring 25 feet in length and 9.3 feet in height, making it ideal for transport and operation in tight job site conditions.