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Komatsu Launches New Crawler Dozer With Tier II Engine

Wed November 08, 2006 - National Edition
Construction Equipment Guide

Komatsu America Corp. has introduced the D475A-5E0 crawler dozer with Tier II engine. Developed to provide increased productivity, reliability and operator comfort for the mining, quarry and large construction industry, the powerful dual-tilt dozer makes dozing and ripping operations easy and smooth with less operator fatigue.

The new Tier II D475A-5E0 has an operating weight of 238,960 lbs. (108,390 kg) and features a powerful, clean SAA12V140E-3 turbocharged, air to air after-cooled diesel engine which provides a maximum net output of 890 hp (664 kW) — with hydraulic fan maximum speed: 860 hp (641 kW).

The new engine is Tier II EPA and EU emissions certified while continuing to provide reliability and fuel economy. Machine matched large blade capacities of 35.6 cu. yd. (27.2 cu m) Semi-U dozer and 45 cu. yd. (34 cu m) U dozer yield increased productivity.

Optimum blade heel angles, moldboard profile and machine balance facilitates an aggressive digging, highly productive and easily controlled machine.

Additional high-tensile strength steel has been incorporated into the front and sides of the blade for increased durability. The D475A-5E0 incorporates an updated eight roller, K-Bogie undercarriage, which significantly reduces vibration experienced by the operator while also providing increased track on ground.

The new dozer is equipped with the latest VHMS technology, which sends machine operating information to a secure Web site utilizing wireless technology. Data such as operating hours, cautions, maintenance alerts and system trend data are relayed to the Web application for analysis.

The VHMS fleet monitoring system allows for remote diagnosis by the distributor, increases machine availability and provides a wealth of other information to drive business efficiently and productively.

Special features of the D475A-5E0 include:

• Easy Operator Control

Komatsu’s ergonomically designed Palm Command Control System (PCCS) gives operators maximum control, offering a relaxed posture and fine control to further reduce operator fatigue. PCCS provides precise and responsive control to both the tracks and blade in direct proportion to control lever PCCS movement.

Thumb push buttons and preset travel speed selection simplifies transmission gear shifting. The preset travel speed selection function enables the operator to select fore and aft travel speed from the preset patterns, which reduces manual gear shifting frequency during machine operations. Combined with the auto-downshift function, gear shifting time during repeated round trip operations is thus significantly reduced.

• Lock-Up Torque Converter

The D475A-5E0 features a lock up torque converter that greatly reduces fuel consumption and offers greater power train efficiency.

The lockup mode allows the system to automatically engage the torque converter lockup clutch for greater efficiency during long pushes. The lockup mechanics of the torque converter automatically transfers engine power directly to the transmission, increasing ground speed and therefore achieving efficiencies equal to a direct drive. This results in reduced fuel consumption and faster cycle times.

• Improved Eight Roller K-Bogie Undercarriage

Komatsu further enhances the innovative K-bogie undercarriage by incorporating a new eight-roller undercarriage.

The additional roller increases the amount of track on ground and significantly reduces vibration and shock when traveling over rough terrain. The improved K-Bogie undercarriage system oscillates with two fulcrums so track roller vertical travel is greatly increased. Since the track rollers are always in contact with the track link, there is reduced impact load and improved durability on the undercarriage components.

A standard track shoe slip control system reduces operator fatigue, improves ripping performance and lowers fuel and repair costs.

• Electronic Control Power Train for Smooth Operation

The D475A-5E0 uses a new powertrain electronic control system that greatly improves operation and productivity.

Electronic Controlled Modulation Valve (ECMV) ensures comfortable and productive dozing. The ECMV automatically controls stroke ratio of steering clutches and brakes depending on degree of load, enabling smooth dozing and turning. When dozing downhill, the ECMV automatically controls steering clutches and brakes depending on incline of machine and load, reducing counter-steering and producing smooth dozing operation.

• Cab Design Keeps Noise Levels at Bay

The D475A-5E0 features a 70 dB(A) low-noise design with a high quality cab interior that is fully lined with sound absorbing material.

The cab features an insulated double floor to reduce power train noise, thicker glass in the door and increased pressurization from improved window seals. Cool air inlet ducts are lined with sound absorbing material that direct the air to the hydraulic fan.

Engineered baffles on the machine absorb and reduce the fan noise, while a double insulated engine hood is equipped with additional sound absorbing material to further reduce engine noise.

For more information, visit

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