Komatsu D575A

The D575A-3 SD Super Dozer can move 125 cubic yards (96 m3) of material per pass if equipped with an optional blade.

[4][5] Surface mine operators in the United States, Australia and Japan were the primary users of the D575A, although they were sometimes used in heavy construction applications and quarries as well.

Komatsu first showed a 1,000 horsepower (750 kW) bulldozer prototype, the D555A, to the public at the Conexpo equipment exhibition in Houston, Texas in 1981.

A successor to the D555A prototype, the D575A-2 SR Super Ripper, began field testing in North America in 1989 by the Cooney Brothers Coal Company in PA where over 1000 hours were logged.

The first D575A-2 SD Super Dozer was purchased and placed into service by the Princess Beverly Coal Co. in Cabin Creek, West Virginia.

In 2012, a custom order was placed by Alcoa in Australia and a final machine was built taking the total A3 build number to 12.

Overall total = 53 machines A 12-cylinder, four-stroke, water-cooled, direct injected, turbocharged, intercooled, 1,150 horsepower (860 kW) Komatsu SA12V170E diesel engine powers the D575A-3.

Alcoa, located in Western Australia purchased 5 machines and used them to rip large areas where they couldn't blast due to the proximity to residential housing and they were often operated by Remote Control.

The machines were operated out of Stockton coal mine in the West Coast region of New Zealand's South Island.

These machines were used to rip above areas where abandoned mine shafts existed and were also often operated via Remote Control.

A successor to the D555A, the D575A-2 SR Super Ripper began field testing in 1989 and was the first model to enter production beginning in 1991.

The D575A-3 is an 1,150 horsepower (860 kW) dozer/ripper weighing 131,350 kilograms (289,580 lb) and capable of moving up to 90 cubic yards (69 m3) of material per pass.

[3] In comparison to its predecessor, the D575A-3 SD includes a significantly re-designed operator cabin and powertrain electronic control system to increase productivity and a number of durability improvements including reinforced undercarriage roller guards, simpler hydraulic plumbing and longer-life hoses, seals, wiring harnesses, and connectors.

Komatsu were happy to absorb this cost as the dozer sales across the entire product line were good so the D575A ran at a loss.

In the early 90's when it was introduced to the market, it was also competing (although actually in a separate weight, power and size class) against the CAT D11N.

At the time, the D475A only held an approximately 35-40% market share when compared to the D11N/R so adding another competitor to their line also in a way, divided sales.

Early machines suffered from catastrophic failures including some burn outs due to powerline and / or engine issues.

At times, new parts would have to be cast and replaced which could take weeks to deliver to job sites on the other side of the world.

After many years without orders, the manufacturing plant in Osaka asked management what to do with the parts jigs and moulds etc that were taking up space.