Description

The 320 DL crawler excavator model is manufactured by Caterpillar. 

Equipped with a powerful Caterpillar engine, this 320 DL 21.5t machine can provide 103kW or 138 horsepower for the crawler excavator. The 320 DL is categorised in the medium-sized machine segment in the crawler excavators category. The 320 D L’s size is 2.98m x 8.96m x 3.12m. The bucket of 320 DL has a capacity of 1m³ which is average for this type of machine.

Building on the solid performance of its 320D predecessor, the new 320D Series 2 Hydraulic Excavator is an exceptionally reliable, highly productive machine that lowers operating costs through reduced fuel consumption and simplified routine maintenance. The 320D Series 2 machine features a new engine, powerful hydraulic system, durable main structures and a refined operator station. 

The new engine, rated at 104 kW (139 hp), uses an electric governor to control the mechanically actuated, low-pressure, fuel-injection system. The new system ensures optimum performance and reliability in areas where fuel quality is less than premium. A new filtration system uses a primary fuel filter/water separator and a secondary fuel filter to ensure clean fuel throughout the system.

The field-proven C7.1 engine is designed for ease of service and can work efficiently at altitudes up to 4,000 meters (13,120 feet). Compared to its predecessor, the new engine uses approximately 3 to 5 per cent less fuel, depending on the work mode. An automatic engine-speed control lowers engine rpm during no-load or light-load conditions to minimize fuel consumption.

Hydraulics, structures, operator environment

The 320D/D L Series 2 implement the hydraulic system, with a main-relief pressure of 35 000 kPa (5,076 psi) and maximum oil flow of 2 x 202 L/min (53 GPM), providing high hydraulic horsepower for digging and lifting, as well as for using heavy-duty, hydraulically powered work tools. 

The pilot-type hydraulic system provides low-effort operation and precise control and maximizes efficiency. Boom and stick regeneration systems save energy during boom-down and stick-in operations, reducing cycle times and adding to overall fuel efficiency.

The 320D/D L Series 2 features a durable mainframe, track frames, and front linkage. Depending on the regional offering, three boom types—reach, mass excavation and super long reach—work with specifically engineered sticks to tailor machines to the application. They feature high strength steel and box-section construction with internal baffles for added durability. The super long reach boom and stick are designed for applications that require a large working envelope.

The ergonomically designed operator station is both quiet and comfortable, and it features a full-colour LCD (Liquid Crystal Display) monitor with a choice of 28 languages. The standard suspension seat is adjustable to accommodate a wide range of operators and to enhance operator comfort and efficiency.

Large windows ensure all-around visibility and promote job-site safety. Viscous rubber cab mounts dampen both vibration and sound transmitted to the operator station, to further enhance operator comfort and productivity. New for the Series 2 is a large metal roof hatch that can be opened for added visibility and air circulation.

Work tools, serviceability

The versatile 320D/D L Series 2 can use a wide range of buckets, either pin-on or coupler-type, along with a selection of ground-engaging tools, to fit the machine to its digging environment for optimum performance and durability. Buckets feature precise geometry for easy loading, which speeds digging cycles, increases production, and conserves fuel. The selection of Series 2 work tools includes grapples, shears, hydraulic hammers, multi-processors, pulverizers, vibratory-plate compactors, rippers and rip-and-load packages. 

The 320D Series 2 features ground-level access to most routine service points, including the pumps, pilot filter and fuel filters, which are conveniently located behind a service door on the right side. The left, rear service door allows easy access to the radiator, oil cooler, air-to-air aftercooler, and AC condenser.

A reserve tank and drain valve attached to the radiator simplify service, and a central grease block on the boom allows easily lubricating of hard-to-reach locations on the front linkage. The Series 2 also is equipped with S•O•S™ (Scheduled Oil Sampling) ports that ensure quality samples from circulating fluid in the engine oil, hydraulic and cooling systems. Convenient hydraulic test ports allow safe, accurate checks of system pressures.