transmission steering clutches/brakes, preset travel speed selection function and auto-shift down function. Upgrades made within the cab also included a new suspension seat and upgraded displays and monitoring systems. These models were produced between the years of 2001 and 2007 and 11 machines were built. 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. Production All Komatsu bulldozers are identified by the letter D (for Dozer) followed by the model number (575A). Following that, the series is represented (-2 or -3) and finally the configuration (SR or SD). Each machine had its model number and serial number stamped onto a personal identification plate that was located inside the cab. Serial Numbers 10001 – 10043 were A2 machines. Serial numbers ceased at 10043 and started back up at 10101 when the A3 series machine production begun. Serial Numbers 10101 – 10112 were A3 machines. Serial numbers 10004 and 10013 were not produced due to the bad luck associated with both numbers (#4 and #13) in Japanese culture. Production numbers were as follows: D575A-2SR = 17 machines D575A-2SD = 24 machines D575A-3SR = 2 machines D575A-3SD = 10 machines Total -2 Machines = 41 machines Total -3 Machines = 12 machines Total SR machines = 19 machines Total SD machines = 34 machines Overall total = 53 machines Specifications A 12-cylinder, four-stroke, water-cooled, direct injected, turbocharged, intercooled, Komatsu SA12V170E diesel engine powers the D575A-3. The D575A-3SD measures tall, long has a ground clearance of . The D575A-3SD features a Super Dozer blade designed to dump, dig or carry that measures high and wide. It has a capacity of 90yd3 (69m3). The D575A-3 could be optioned with a Semi-U blade or a U-dozer blade. Either could be ordered with single or dual tilt cylinders. The Semi-U has a capacity of 44.5y3 (34m3) while the U-dozer blade has a capacity of 58.8yd3 (45m3). The D575A-3SD has a ground contact area of and exerts an average ground pressure of . The D575A-3 Super Ripper weighs 289,570 lb (131,350kg). The D575A-3SD weighs 336,420 lb (152,600kg). Applications From new, North American companies purchased 31 machines, 14 machines were sold to Australia and 8 machines were sold within Japan. Within the United States, the D575A bulldozers were primarily used in surface mines in West Virginia, mostly operating for Alpha Natural Resources and