FILE PHOTO: New excavators are seen at a port in Yokohama, south of Tokyo February 10, 2011. REUTERS/Toru Hanai/File Photo

(Reuters) - Caterpillar Inc CAT.N said on Wednesday said that the ongoing investigation related to its tax and export activities will not have a material adverse effect on its results.

In March, U.S. law enforcement officials had raided three of the heavy machinery manufacturer’s Illinois facilities as part of an Internal Revenue Service probe related to profits earned by the company’s Swiss unit.