New assembly factory was completed in 2005 and foundry in 2006.

The company invested over to double its capacity with new assembly factory and foundry, there by enabling it to meet steadily rising demand for its products. In 2007 also sheet metal, painting factory and wooden pattern mold factory was completed.The monthly production capacity of these plants is 1800 tons.

​Okamoto promotes the start-to-finish integrated production system.