The Komatsu D155AX-6 crawler tractor has a Komatsu SAA6D140E-5 direct injection, turbocharged, aftercooled, six-cylinder, diesel engine producing 354 flywheel horsepower (FWHP). It has a Torqflow transmission and an operating weight of 87,100 pounds (39,500 kg). It comes standard with a hydrostatic steering system, palm command control system, hydraulically driven radiator cooling fan, gull-wing engine side covers, spacious integrated ROPS cab, large LCD monitor, newly designed ripper, modular power train, wet disc brakes, closed-center load sensing hydraulic system, and double reduction, spur and planetary final drives. It also features KOMTRAX technology, which sends equipment information and diagnostics to a secure website to be analyzed.

The D155AX-6 has semi-U, full-U, and strengthened dozer blades and a SIGMADOZER, which is designed to reduce digging resistance and produce smoother material roll up to increase blade load. It also has completely protected blade tilt lines.

The D155AX-6 K-bogie undercarriage system has increased track strength and seven rollers.