Caterpillar has released the 390D L, a new 90t hydraulic excavator, which replaces the 385C L. The new machine incorporates a refined design that according to Cat provides greater hydraulic power, stronger structural components, added safety and convenience features, plus improved serviceability. The net result states Caterpillar “is a more productive, more durable, more efficient machine that is comfortable to operate and can take on the toughest jobs in a range of heavy construction and mining applications.”Powering the new 390D L is an 18.1l Cat C18 ACERT diesel engine, which is EU Stage IIIA and US EPA Tier 3 compliant and rated at 390kW. The C18 features advanced electronic control, precise fuel delivery and refined air management for optimum performance, fuel efficiency and emissions control. The engine’s torque characteristics allow full power at maximum rpm, resulting in efficient hydraulic pump operation and positive hydraulic response. Refinements in the crankcase, cylinder heads and proprietary MEUI (Mechanical Electronic Unit Injector) fuel system provide enhanced performance and durability for the C18.

Design enhancements in the 390D L’s implement hydraulic system allow the new model to deliver significantly greater digging and lifting forces than its 385C predecessor. Increased breakout force promotes faster trenching and loading cycles plus stronger performance at the quarry face. In addition, lifting capacity over the end is increased by 14% with over-the-side capacity up nearly 14%, the result of stronger hydraulics and a heavier counterweight.

An improved undercarriage for the 390D L features redesigned links that operate with lower stress, forged idlers for improved durability and heavy-duty track rollers and carrier rollers. In addition, the recoil spring has been lengthened, giving the recoil mechanism greater impact-absorbing capability to protect the undercarriage system from shock loads.