Exhibit 23(a) CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS As independent public accountants, we hereby consent to the incorporation by reference in this Amendment No. 2 to S-3 Registration Statement of our report dated January 21, 1999 included in Case Corporation's Form 10-K/A for the year ended December 31, 1998 and to all references to our Firm included in this registration statement. Arthur Andersen LLP Milwaukee, Wisconsin April 19, 1999