Komatsu Service Manuals, Fault Codes and Wiring Diagrams

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   The history of one of the largest manufacturers of mechanical engineering Komatsu begins in 1921. On January 19, 1921, Takeuchi Mining Industry opens Komatsu Steel Works to manufacture machine tools and mining equipment. In May, Komatsu Iron Works departed from Komatsu Iron Works to become Komatsu Ltd. The official date of birth of the company is May 13, 1921.


When, back in 1917, the Japanese entrepreneur Meitaro Takeuchi founded his small repair and technical workshop, he originally intended it for servicing mining equipment. The Japanese hieroglyph "Komatsu" itself can be translated as "little pine tree" - this is the name of the small town where the workshop began.


Since then, almost a hundred years have passed, and now Komatsu is famous all over the world for the excellent quality of its equipment. The main component of Komatsu's industrial production is equipment for road construction works, in particular, bulldozers. The first, in the history of export deliveries to the USSR, a komatsu bulldozer as part of a whole batch of cars appeared in the 60s of the last century, when the construction of grandiose oil and gas pipelines from the Asian to the European part of the Soviet Union and further to Western Europe began. It was Komatsu bulldozers that proved to be the most adapted to the harsh conditions of Siberia.


The company took up bulldozers relatively late: the first-born of the enterprise, the D50 bulldozer, was produced only in 1947, but even now this model can be found in the ranks of existing machines of a number of domestic road-building organizations.

The modern line of standard sizes for such a direction as the komatsu bulldozer is represented by 9 models of mainly medium and heavy machines. This is the Komatsu Vanguard 2, 3 and Super series, which have been produced for the past ten years. The mass of the machines is from 36 to 148 tons with an engine power from 238 to 858 kW.


Komatsu bulldozers gained such great popularity due to:

a double skewed blade system;

built-in torque converter with a unique automatic locking system;

four-valve turbodiesel engine;

the patented TORQFLOW transmission system;

the presence of an elastic suspension of the balance bar;

original and extremely efficient disc brake design.

Any general reasoning is of little use until we consider it in relation to one of the modern models. As an example, consider a komatsu bulldozer of the D 375A-3 brand, the capabilities of which allow its successful and high-performance operation (see Fig. 4).


Bulldozer D 375A-3 weighing 66 tons belongs to the heavy class of machines. It has a modular design (another "trick" from Komatsu!), Which allows you to quickly and easily change the body of the bulldozer, adapting it to specific production needs, and also facilitates machine maintenance. The modularity of the bulldozer, all the units of which (as well as others, by the way) are developed and manufactured at the enterprises of the company, which determines, firstly, reliability, as well. secondly, perfect compatibility of individual modules. The D 375A-3 bulldozer can not only move up to 22 m3 of bulk materials, soil, gravel and stone (including especially hard and frozen rocks), but also successfully carry out a variety of overburden operations.


Any manufacturing company will be successful if it does not stop there, but continues its movement along the path of technological progress. Komatsu is no exception.