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Komatsu D31EX-22, D31PX-22 Crawler Dozers Included in HST Dozer Fleet

Tue June 08, 2010 - National Edition
Construction Equipment Guide

Komatsu America Corp.’s D31EX-22 and D31PX-22 crawler dozers, equipped with Komatsu’s hydrostatic transmission (HST), are designed for work in general construction, site preparation, home building, forestry and utility applications. Building on the design of the D51-22 dozer series, the D31EX-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.

Outfitted with a fuel efficient 3.26 L, EPA Tier III emissions certified Komatsu SAA4D95LE-5 engine, these new models push with a net power of 78 hp (58 kW) at 2,200 rpm and range in operating weight from 17,020 to 18,827 lbs. (7,720 to 8,540 kg), depending on the machine version. With 86 in. (218 cm) of track on the ground both standard (EX) and low ground pressure (PX) models offer customers weight distribution and flotation options to best match their application, according to the manufacturer.

The D31-22 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 D31-22 dozers employ a large power angle tilt blade with a capacity of 2.09 to 2.11 cu. yd. (1.6 to 1.6 cu m), which results in more material staying on the blade and making it a more productive machine.

The new dozer is equipped with KOMTRAX technology, which sends machine operating information to a secure Web site utilizing wireless technology. Hour meter, location, cautions and maintenance alerts 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.

Features of the D31EX/PX-22 include:

Hydrostatic Transmission

Selection of either variable or quick-shift speed control allows the D31-22 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 as 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 on an LED monitor display and controlled by 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 provide 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 operators while moving them closer to the blade for improved visibility and increased comfort. Internal cab air pressure and air filters minimize dust inside 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 to provide efficient operation while enhancing 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 Equals Guaranteed Reliability

Acknowledging that maintenance is critical for successful equipment uptime, Komatsu designed the D31-22 with easy routine maintenance in mind. Daily engine checks are grouped at the left-hand side of the engine compartment for easy access, while the rear mounted swing-up electronically-controlled reversible hydraulic fan allows for easy checks of the radiator, oil cooler and charge air cooler. The D31-22 also boasts extended undercarriage life with large links and large diameter bushings for reduced undercarriage maintenance costs.

Other features that contribute to 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 with increased bushing diameter, improved seals, long link pitch and a lubricated track.
  • Large bolt-on center blade ball increases wear life.
  • Central cab monitor is equipped with onboard diagnostics to help speed repairs.
  • Heavy-plate steel and strong steel castings used throughout.

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