Komatsu GS360-2(S/N 12001-UP)

The Komatsu GS360-2 (S/N 12001-UP) is a wheel-type self-propelled road and soil stabilizer/reclaimer, not a motor grader despite the GS designation. It runs a Komatsu S6D140-1 inline six-cylinder diesel, a mechanically-governed engine of roughly 15.2 liters displacement with no electronic engine controls or fault-code system, consistent with its late-1980s Japan-market production run. Full operating weight isn't published for this exact serial block; it sits at the large end of Komatsu's tire-mounted stabilizer line, riding on tandem drive wheels rather than tracks. The GS360-2 followed Komatsu's earlier first-generation GS360, and the S/N 12001-UP block represents a later production run within the -2 series rather than a separate model. Komatsu offered it with a standard mixing rotor rated to 400 mm (15.7 in) digging/mixing depth, plus an optional deep rotor extending to 700 mm (27.6 in), and a factory water injection system for dust control and bit life. A track-mounted sibling, the CS360-2, shared the same engine family but used a different undercarriage and belongs to a separate parts lineage.

Across its production run the GS360-2 line saw incremental running changes rather than a clean model-generation split; the S/N 12001-UP block marks one of those mid-run updates, though Komatsu's surviving public literature doesn't spell out exactly what changed at that break point. What stays constant is the machine's job: breaking pavement, digging, crumbling, and mixing in a single pass, work that on modern sites is usually split across separate mills, rippers, and reclaimers. In today's parts market the GS360-2 matters less as an active fleet machine and more as a legacy unit still doing farm and rural road subbase work in some regions. Its S6D140-1 engine was shared with other larger Komatsu wheel loaders and graders of the same era, so engine parts stay easier to source; the stabilizer-specific rotor, gearbox, and water injection components are the harder finds and drive most of the demand on the used-parts side.

Below: full specifications, fluids & capacities, the factory service schedule, common service parts, verified fault codes, what owners discuss, attachment guidance, the complete assembly directory, and a serial-number reference. Complete parts lists with full OEM part numbers, exploded diagrams, quantities, and fitment data are available free in Heavy Parts AI.