Caterpillar unveils new heavy excavators at ConExpo show.
Caterpillar has used the ConExpo show in Las Vegas to unveil a pair of uprated models in its excavator line: the Cat 374D and the 390D. The new Cat 374D hydraulic excavator, a direct replacement for the model 365C, combines added horsepower, stronger hydraulics and greater operating weight to boost overall performance, whether trenching, loading, lifting or handling attachments. Complementing these design basics are undercarriage improvements, a new range of buckets, operator-convenience features, safety enhancements and serviceability improvements. The 374D weighs 71,132 kg.
Rated at 355 kW, the Tier 3/Stage IIIA-compliant Cat C15 engine provides the 374D with 18 percent more power than its predecessor, the 365C.
The 374D implement hydraulic system features a 10-percent increase in flow and a 9-percent gain in main pressure, resulting in a significant boost in hydraulic horsepower. The added hydraulic power combines with larger digging arm and bucket cylinders to yield 17 percent higher digging arm forces and 12 percent higher bucket forces on machines with the standard (reach) boom and arm configuration. For units in the mass excavation configuration, digging arm forces also are up by 17 percent and bucket forces by 5 percent. The net result is shorter cycle times and increased bucket fill factors.
A new line of buckets for the 374D are designed for added strength and durability to accommodate the higher digging forces of the new machine. Bucket types include general duty, heavy duty, severe duty and extreme duty. All Cat buckets feature K Series™ GET (Ground Engaging Tools). Work tools for the 374D extend the machine application into such operations as demolition, scrap processing and quarry work.
The new 90 tonne Cat 390D L Hydraulic Excavator, which replaces the 385C L, incorporates a refined design that provides greater hydraulic power, stronger structural components, added safety and convenience features, plus improved serviceability.
Design enhancements in the implement hydraulic system allow the 390D L to deliver significantly greater digging and lifting forces than its 385C predecessor. Main relief pressure in the implement circuits has been increased to 35,000 kPa, up nearly 10 percent from that of the 385C.
A universal quick-coupler circuit is available for factory installation and is compatible with both dedicated and pin-grabber type couplers. The system features an offset lifting eye and easy-to-use controls.
