Komatsu introduces Tier 4 Final D155AX-8 crawler dozer

An automatic gearshift transmission and lock-up torque converter on the new Komatsu D155AX-8 crawler dozer reduces fuel efficiency while the Tier 4 Final engine ensures low emissions output.

Komatsu D155 Ax 8 Crawler Dozer 547378644c10b

Komatsu America Corp. announces the D155AX-8 crawler dozer with an operating weight of 89,300 lbs. Rated at 354 hp net, the D155AX-8 is powered by a Komatsu SAA6D140E-7 engine, which is EPA Tier 4 Final emissions certified. Komatsu’s Tier 4 Final engines were built on a solid foundation that started in 1996 with the introduction of Komatsu’s first Tier 1 engines. The resulting benefit today is a Tier 4 Final engine that is productive, dependable and efficient. This new crawler dozer leverages Komatsu’s leadership in technology and innovation by delivering a more environmentally friendly engine that provides high levels of performance while reducing fuel consumption and operating costs.

The D155AX-8 is equipped with the latest KOMTRAX technology. Data such as fuel levels, DEF levels, operating hours, location, cautions and maintenance alerts are relayed to the web application for analysis. A new Operator Identification System reports key operating information for multiple operators and a new Auto Idle Shutdown function helps reduce idle time as well as operating costs.

Key features of the new crawler dozer include:

Komatsu Tier 4 Final Emission Certified Engine Productive, Dependable, Efficient

Komatsu has built upon its strengths using a proven Tier 4 Interim foundation to integrate Selective Catalyst Reduction (SCR) that further reduces NOx emissions using Diesel Exhaust Fluid (DEF). The Komatsu EPA Tier 4 Final engine uses an advanced electronic control system to manage the air flow rate, fuel injection, combustion parameters and aftertreatment functions to optimize performance, reduce emissions and provide advanced diagnostic capability. The result is lower fuel consumption with no loss of performance. Komatsu continues to use a Komatsu Variable Geometry Turbocharger (KVGT) and Exhaust Gas Recirculation (EGR) valve with hydraulic actuator for more precise temperature and air management control as well as longer component life.

To ensure product reliability and durability in demanding conditions, Komatsu developed the entire system, including the control software, which is critical to the effective operation of the aftertreatment system. This control system is also integrated into the machine’s on-board diagnostics systems and KOMTRAX, Komatsu’s standard telematics system.

Innovative SIGMADOZER blade for unsurpassed productivity

The D155AX-8 is equipped with a 12.3 yd³ SIGMADOZER blade which gives the machine a high blade capacity. The SIGMADOZER dramatically improves dozing performance and increases productivity up to 15% over a conventional Semi-U blade. The blade features a frontal design concept adopted for digging and rolling material at the center of the blade. The unique blade shape increases soil holding capacity. Digging resistance is reduced for a smoother flow of material so larger amounts of soil can be dozed with less power.

For example, think of a conventional Semi-U blade as a flat shovel and the SIGMADOZER as a spade nose shovel. A spade nose shovel is easier to push through the soil and requires less energy. The SIGMADOZER works similarly to a spade nose shovel. 

Automatic transmission significantly improves fuel economy

The D155AX-8 has an automatic gearshift transmission and lock-up torque converter that greatly reduces fuel consumption and provides exceptional power train efficiency. The lockup torque converter automatically transfers engine power directly to the transmission, decreasing fuel consumption by up to 10% while machine power is maintained.

Ergonomic joystick controls for ease of operation and comfort

Komatsu’s ergonomically designed Palm Command Control System (PCCS) gives operators maximum control, offering a relaxed posture and superb fine control to eliminate operator fatigue. Thumb push buttons simplify transmission gear shifting. The electronic blade and ripper control joystick offer excellent machine control. Blade auto pitch function minimizes repetitive lever movements and reduces operator fatigue. The ripper now incorporates a new auto-return function to increase operator efficiency when ripping.

Electronic control powertrain for smooth operation

The D155AX-8 uses an electronic control powertrain system that significantly improves operation and productivity. Powerful turns under various work conditions are achieved with the Hydrostatic Steering System (HSS). Counter-rotation is available while in neutral for minimum turning radius, providing excellent maneuverability. When operating in adverse conditions such as uneven ground, a K-bogie undercarriage system keeps the correct alignment between the rollers and links for a smoother ride as well as longer component life.

Cab design creates optimal operator environment

The new crawler dozer’s more comfortable working environment allows the operator to concentrate on the work at hand for increased productivity. A high capacity air suspension seat with heat is standard. The large cab is integrated with the ROPS (Roll-Over Protection Structure) for excellent side visibility.  The dozer’s cab mounts reduce shocks and vibration even over adverse conditions and the interior cab decibel level is a very low for a noticeably quieter working environment. 

A new high-resolution large color 7-inch LCD monitor with pull-down menus enables quick operational adjustments and has enhanced service diagnostics capability. A rear view monitoring system is standard and can be set to synchronize with reverse operation.

All Komatsu Tier 4 Final construction machines come with Komatsu CARE complementary scheduled maintenance for three years/2,000 hours. Komatsu CARE work is performed by a skilled Komatsu certified technician and includes a 50-point inspection at each service and two complimentary KDPF exchanges and DEF tank flushes within the first five years.