EXHIBIT 23 CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS We have issued our reports dated February 20, 2004, accompanying the consolidated financial statements and schedule included in the Annual Report of A.S.V., Inc. on Form 10-K for the year ended December 31, 2003. We hereby consent to the incorporation by reference of said reports in the Registration Statements of A.S.V., Inc. on Forms S-8 (File No. 33-94248, effective June 30, 1995, File No. 33-94250, effective July 3, 1995, File No. 333-43075, effective December 23, 1997, and File No. 333-64291, effective September 25, 1998). /s/ GRANT THORNTON LLP Minneapolis, Minnesota February 20, 2004