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Komatsu Launches D155AX-8 Crawler Dozer

Komatsu's D155AX-8 is powered by a Komatsu SAA6D140E-7 engine which is EPA Tier IV Final emissions certified.

Mon July 14, 2014 - National Edition
Construction Equipment Guide

With an operating weight of 89,300 lbs. (40,506 kg) and a net 354 hp, Komatsu’s D155AX-8 is powered by a Komatsu SAA6D140E-7 engine which is EPA Tier IV Final emissions certified.
With an operating weight of 89,300 lbs. (40,506 kg) and a net 354 hp, Komatsu’s D155AX-8 is powered by a Komatsu SAA6D140E-7 engine which is EPA Tier IV Final emissions certified.

With an operating weight of 89,300 lbs. (40,506 kg) and a net 354 hp, Komatsu’s D155AX-8 is powered by a Komatsu SAA6D140E-7 engine which is EPA Tier IV Final emissions certified.

The D155AX-8 is equipped with the latest KOMTRAX remote monitoring technology with data access via the web or via KOMTRAX Mobile on your smart phone. In addition to providing data such as fuel levels, operating hours, location, cautions and maintenance alerts, KOMTRAX has been further enhanced to monitor AdBlue/DEF levels, ambient air temperatures and pressures. A new operator identification system reports key operating information for multiple operators. A new auto idle shutdown function helps improve operating costs by reducing unnecessary idle time.

Key features of the new crawler dozer include:

Komatsu Tier IV Final Emission Certified Engine — Productive, Dependable, Efficient

Komatsu’s EPA Tier IV Final engines are built on the strength of its Tier IV Interim foundation. By integrating selective catalyst reduction (SCR), the Tier IV Final engine further reduces NOx emissions using AdBlue/DEF. The Komatsu Tier IV Final engine uses an advanced electronic control system to manage the air-flow rate, fuel injection, combustion parameters, and after treatment 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 an exhaust gas recirculation (EGR) valve 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 also is integrated into the machine’s on-board diagnostics systems and KOMTRAX, Komatsu’s standard telematics system.


The D155AX-8 is equipped with SIGMADOZER blade, which gives the machine a high blade capacity of 12.3 cu. yds. (9.4 cu m). The SIGMADOZER improves dozing performance and increases productivity up to 15 percent 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 new blade 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, according to the manufacturer.

Automatic Transmission Improves Fuel Economy

The D155AX-8 has an automatic gearshift transmission and lock-up torque converter that reduces fuel consumption and provides increased power train efficiency. The lock-up torque converter automatically transfers engine power directly to the transmission, decreasing fuel consumption by up to 10 percent 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. 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 power train system that 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 added 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 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) for added side visibility. The dozer’s cab mounts reduce shocks and vibration even over adverse conditions and the interior cab decibel level is very low for a noticeably quiet working environment.

A newly enhanced high-resolution large color 7 in. LCD monitor in the cab displays all machine information. A rear view monitoring system is standard and can be set to synchronize with reverse operation.

All Komatsu Tier IV machines come with Komatsu Care. Komatsu Care provides complimentary scheduled maintenance for the first three years or 2,000 hours (whichever occurs first.) It also includes a 50-point inspection at each service and two complimentary KDPF exchanges in the first five years.

For more information, visit

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