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Komatsu Adds Two Crawler Dozers to Its HST Fleet

Fri August 22, 2008 - National Edition
Construction Equipment Guide

Equipped with Komatsu’s Hydrastatic Transmission (HST), the D39EX-22 and D39PX-22 crawler dozers are designed for work in general construction, site preparation, home building, forestry and utility applications. Building on the success of the D51-22 dozer series, the D39EX-22 machines feature a super-slant nose coupled with a new cab forward design that moves the operator closer to the blade while improving machine balance, ride and stability, according to the manufacturer.

Outfitted with a fuel efficient 4.5-L, EPA Tier III emissions certified Komatsu SAA4D107E-1 engine, these new models push with a net power of 105 hp (78 kW) at 2,400 rpm and range in operating weight from 20,834 to 21,804 lbs. (9,450 to 9,890 kg), depending on the machine version.

Both standard (EX) and low ground pressure (PX) models are available to offer customers weight distribution and flotation options to best match their application.

The D39-22 steering system provides smooth agile movement when dozing, even in gradual turns, permitting the operator to approach dozing objects accurately in corner grading and sidewall operations. The D39-22 dozers employ a large power angle tilt blade with a capacity of 2.89 to 3.01 cu. yd. (2.2 to 2.3 cu m), which results in more material staying on the blade.

The new dozer is equipped with the latest Komtrax technology, which sends machine operating information to a secure Web site utilizing wireless technology. Hour meter, location, cautions and maintenance alerts — to name a few of its features — are relayed to the web application for analysis. The Komtrax fleet monitoring system increases machine availability, reduces the risk of machine theft, allows for remote diagnosis by the distributor, and provides a wealth of other information to drive business efficiency and productivity.

Special features of the D39EX/PX-22 include:

• Hydrostatic Transmission

Selection of either Variable or Quick-shift speed control allows the D39-22 dozers to achieve maximum efficiency during fine or rough grading operations with optimal travel speeds to match job conditions and operator preferences. Switching between modes is simple as pushing a button.

When the Variable speed is selected, travel speed is adjustable through a 20 incremental speed range. Travel speed is shown by an LED monitor display, and is controlled by utilizing the shift buttons on the PCCS travel control. The Quick-shift Speed Selection enables the operator to select three predetermined speed settings to match job conditions. A separate brake and decelerator pedal are provided for easy predictable operation.

• Blade Visibility and Comfortable Ride

The new cab forward, integrated ROPS / FOPS dozer cab, designed with large glass windows, provides more room for the operators while moving them closer to the blade, improving blade visibility and increasing comfort. Internal cab air pressure and air filters minimize dust entering the cab, and new cab damper mounts suppress noise and vibration when traveling over rough terrain.

• Palm Command Control System (PCCS)

Komatsu’s low-effort Palm Command Control System (PCCS) is ergonomically designed not only to provide efficient operation, but also enhances operator comfort. The Palm Command Control System travel joystick allows the operator to maintain a relaxed posture without sacrificing control. The blade control joystick utilizes the Proportional Pressure Control (PPC) valve for fine control of machine operation.

• Convenient Maintenance

Komatsu has designed the D39-22 with easy routine maintenance in mind. Daily engine checks are grouped at the left side of the engine compartment for easy access. While the rear mounted swing-up electronically-controlled reversible hydraulic fan allows for easy checking of the radiator, oil cooler and charge air cooler. The D39-22 also boasts extended undercarriage life with large links and large diameter bushings for reduced undercarriage maintenance costs, according to the manufacturer.

Other items aiding in maintenance efficiency and machine durability include:

• Ground level daily checks for easy maintenance.

• Hydraulic dynamic braking system, requiring less maintenance than conventional braking systems.

• Improved track life through increased bushing diameter, improved seals, longer link pitch and a lubricated track.

• Large center blade ball increases wear life.

• Central cab monitor is equipped with onboard diagnostics which help speed repairs.

• Heavy-plate steel and strong steel castings used throughout.

For more information, visit

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