CATERPILLAR 311F CRAWLER EXCAVATOR

Technical Description

The Caterpillar 311F is a robust hydraulic excavator designed for versatility and efficiency in medium-duty applications. It features a Cat® C3.4B engine delivering 70 hp (52 kW) net power, compliant with Tier 4 Final emission standards, ensuring a balance between power and reduced environmental impact. The machine operates at an operating weight of approximately 30,600 lbs (13,900 kg), making it stable for heavy lifting and digging tasks. Equipped with a 4.3 meter (14'1") reach boom and a 2.8 meter (9'2") stick option, the 311F offers a maximum digging depth of 18.3 feet and maximum reach along the ground of 26.6 feet, providing a large working envelope suitable for a range of excavation operations. The bucket capacity is typically around 0.53 cubic meters, with bucket digging force rated at 89 kN (about 20,000 lbf) and stick digging force at 52 kN (approximately 11,690 lbf), enabling efficient penetration and material handling. Its hydraulic system delivers a main flow of up to 125 liters per minute per pump with maximum hydraulic pressures up to 4424 psi for equipment and 3336 psi for swing functions, ensuring responsive and smooth operation. The swing mechanism provides a speed of 10 rpm and torque of 30.9 kN·m, facilitating precise movements. The maximum travel speed is 5.4 km/h (3.4 mph), with a drawbar pull capacity of 114 kN. Structural durability is enhanced by thick multi-plate fabrications, baffle plates inside booms and sticks, and self-lubricated bearing surfaces, reducing maintenance and extending service intervals. Operator comfort is ensured with a pressurized cab and noise levels maintained at 72 dB(A). Overall, the Caterpillar 311F combines powerful performance, advanced hydraulic control, and durable construction for reliable excavation tasks.