The newest additions to Caterpillar’s D-Series line of excavators, the 320D L, 320D LRR and 321D LCR, feature greater performance and versatility than the C-Series machines they replace. The machines also feature the Tier III-compliant Cat C6.4 engine with ACERT Technology, providing 148 net hp for fuel-efficient operation and emissions compliance.
The 320D L has a standard tail swing radius of 9 ft. It is designed for heavy and general construction and offers the largest digging envelope, more undercarriage and front linkage options and ground-level access to all major service points.
The reduced radius design of the 320D LRR has a tail swing radius of 6 ft 7 in., making it well-suited for work in areas with restricted space, such as in cities and in industrial and demolition applications.
With a tail swing radius of 5 ft 6 in., the 321D LCR has been designed to excel in road construction requiring work adjacent to active traffic lanes and in tunneling and other underground applications.
The excavators have about 7% more engine power and increased hydraulic pressure for increased breakout force, greater lift force and a 5% increase in drawbar pull, which combine to deliver faster cycle times and superior productivity. The heavy lift circuit is now standard on D-Series models.
A new, spacious cab promotes operator comfort in the 320D L and 320D LRR, and a new cab layout aids operators in the 321D LCR. The seat and armrests are easy to adjust to suit the operator. A new, optional air suspension seat with heater is available. The fully automatic climate control adjusts temperature and airflow.