Crawler Dozers feature hydrostatic steering system.

Press Release Summary:

Mid-Size Models D61 EX-15 and D61 PX-15 are standard- and low ground-pressure dozers, respectively, outfitted with Tier II compliant SA6D1 14E-2 engine. They push with 155 hp at 1,850 rpm and range in operating weight from 35,080-41,010 lb. Hydrostatic Steering System eliminates steering clutch and offers agile movement when dozing. Power angle tilt blade offers capacity of 4.4 yd³ for D61 EX-15 and 5.0 yd³ for D61 PX-15. Multi-shank rippers can rip over 2 ft below surface.

Original Press Release:

Komatsu Adds D61EX/PX-15 to its Mid-Size Dozer Line; Hydrostatic Steering System (HSS) Offers Contractors Agile, Powerful Dozing

o Hydrostatic Steering System provides superior control in varying conditions
o Palm Command Control System eases operation, enhances comfort

VERNON HILLS, Ill. - July 27, 2004 -Komatsu America Corp. (KAC) introduces the D6l EX-15 and D61 PX-15 crawler dozers -mid-sized machines for work in construction, site preparation, home building, forestry, utility and quarry applications. Outfitted with Komatsu's Tier II compliant SA6D1 14E-2 engine, the D61EX/PX-15 models push with 155 HP at 1,850 RPM and range in operating weight from 35,080- to 41,010-lbs, depending on model. Both standard (EX) and low ground pressure (PX) models are available to offer contractors weight distribution/flotation options to match their application.

Komatsu's Hydrostatic Steering System (HSS) eliminates the conventional steering clutch and offers faster, more agile movement when dozing - ultimately keeping more material on the blade and making operators more productive. The large power angle tilt blade offers a capacity of 4.4 yd³ for the D61EX- 15 and 5.0 yd³ for the D61PX- 15. Large multi-shank rippers capable of ripping over two feet below the surface add an extra dimension of productivity, making the D61 effective in even the hardest, rockiest conditions.

HSS Dozes Circles Around Competition
Komatsu's line of mid-sized dozers with HSS offers operators a machine with faster response to controls and quicker, more precise turning. Powered by an independent hydraulic pump with engine power transmitted to both tracks, the outside track is allowed to move faster than the inside track for smooth, continuous turns. Komatsu's D61 offers a reduced turning radius and the ability for counter-rotation under certain conditions, whereas competitive machines with conventional steering systems still rely on the cumbersome back-and-forth method of turning. A larger steering pump and motor capacity allows for the minimum turning radius along with greater steering forces, ultimately keeping more material on the blade.

Further aiding maneuverability, auto shift and auto down shift features monitor engine speed, travel gear and travel speed, downshifting when travel speeds are reduced to maintain optimum speed for efficient operation.

Komatsu's Palm Command Control System (PCCS), new to the D61, 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, and when combined with HSS allows for fine control of machine operations.

Komatsu's Torqflow transmission (planetary gear multi-disc, hydraulically actuated) automatically adjusts each clutch engagement per travel conditions such as gear speed, revolution and shifting patterns through Komnatsu's Electronic Controlled Modulation Valve (ECMV). ECMV provides smooth, shockless clutch engagement for improved component reliability, longer life, and a smoother ride for the operator.

Operator Comfort
The new hexagonal shape of Komatsu's dozer cab, designed with large, tinted glass windows, provides more room for the operator and expands front, side and rear visibility, increasing comfort and safety. Internal air pressure and air filters prevent dust from entering the cab, and new cab damper mounts suppress noise and vibration when traveling over rough terrain. A newly designed, fully adjustable, high back suspension seat offers improved fore and aft sliding rails, while a new suspension spring provides increased strength and rigidity. The seat is also adjustable 15 degrees to the right for increased visibility during reverse operations.

Focused on Your Success: Convenient Maintenance = Guaranteed Reliability
Knowing that preventative maintenance is critical for successful equipment upkeep, Kornatsu has added an on-board, self-diagnostic monitor that alerts the operator to potential problems before they happen. When turned ON, the monitor displays items that require attention before the machine is started. If abnormalities are found, warning lamps blink and buzzers sound before and during operation to prevent the development of serious equipment problems.

The D61 features conveniently located maintenance points for quick and easy inspection and maintenance. Transmission and HSS oil filters, power train oil level gauges and the hydraulic tank all are arranged on the right side of the machine. Access to the engine and critical filters is improved by gull-wing engine side covers. These side doors consist of a thicker, more durable one-piece structure to protect critical components. Other items aiding in maintenance efficiency and machine durability include:
o Longer intervals between engine and hydraulic oil changes (both over previous models and the competition), resulting in increased up time and productivity.
o Power train components sealed in a modular design, allowing components to be mounted and dismounted without spillage.
o Wet disc braking system, requiring less maintenance than conventional braking systems.
o Improved track life through increased bushing diameter, link height and a lubricated track for minimized wear.

Komatsu America Corp. (KAC) is the second-largest manufacturer and supplier of construction, mining and utility equipment and parts and services in North America. Visit Komatsu America's website at

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