The new Cat® 349D2 hydraulic excavator, with an operating weight ranging from 45,382 to 48,185 kg (100,100 to 106,200 lb), features heavy-duty major structures that allow the new model to take on the most severe applications. Three undercarriage options and various boom-and-stick combinations allow the 349D2 to be tailored to its task, ensuring optimum performance and durability. The fuel-efficient, 301-kW (403-hp) Cat C13 engine combines with a powerful, precise hydraulic system to ensure high production in all applications, whether the machine is working with a bucket or any of the extensive range of Cat work tools.
Electronic controls govern the C13 mechanically actuated unit-fuel-injection system, which operates at high pressure to ensure complete combustion and optimum fuel economy.
349D2 owning & operating costs have been reduced by reverting to optimized Economy Mode each time the machine is started regardless of what mode the operator had previously selected. This reduces fuel consumption as much as 9 percent to better meet customer needs. The exclusive Caterpillar ADEM™ A4 electronic control module allows the engine to respond quickly to varying conditions with optimum performance and economy.
Undercarriage options include the standard length configuration (349D2) with a track length of
5 070 mm (16.6 ft.) and the long undercarriage configuration (349D2 L) with a track length of 5 360 mm (17.6 ft.). Track chains for all options are greased and sealed to reduce travel noise and to reduce internal pin/bushing wear for lower operating costs.
Also available for all undercarriages is the Cat Positive Pin Retention 2 (PPR2) track system, designed for high-impact/high-travel applications. The system mechanically locks the link to the pin, reducing link movement to tightly control seal motion for maximum grease retention. Stronger track links in the PPR2 system resist fatigue and crack formation, and optional cast idlers are designed for extended life in these applications.
The 349D2 upper main frame is robotically welded to ensure consistent, high quality welds and features box-section main channels connected by a massive tube at the boom foot for rigidity and strength. Curved side rails in the outer frame resist bending and torsional loads. Pentagonal-section track frames for undercarriage are fabricated of thick steel plate for optimum durability.
To accommodate a wide range of digging, loading, trenching and work-tool applications, various boom-and-stick combinations are available. The standard reach boom works with the 2.9 meter (9.5 ft.), 3.35 meter (11 ft.) or 3.9 meter (12.8 ft.) stick. The mass-excavation boom has two stick choices with lengths of 2.5 and 3.0 meters (8.2 and 9.8 ft.).
An extensive range of Cat work tools—including buckets, hammers, grapples, shears, multi-processors and rippers—enhances versatility and utilization. The new Cat Pin Grabber Coupler meets or exceeds all global industry standards including EN474, ISO13031 for coupler safety. Field-installed hydraulic kits for work tools feature pre-made hoses and pre-bent, pre-painted tubes as well as comprehensive instructions to simplify installation.
The pilot-operated hydraulic system—providing low-effort, proportional control of implement, swing and travel functions—uses two main pumps that use all of the power output of the engine in all operating situations for maximum efficiency. Oil-regeneration systems for the boom and stick circuits shorten cycle times, reduce the load on the main pumps, and conserve fuel.
The system provides priority for boom-up and swing operations by automatically assigning oil flow based on lever movement, eliminating the need for work-mode buttons. Cylinder snubbers cushion end-of-stroke shock for reduced sound levels and extended component life.