<DOCUMENT>
<TYPE>EX-99
<SEQUENCE>3
<FILENAME>repexh99-1.txt
<DESCRIPTION>EX99-1, CERTIFICATION CEO
<TEXT>


                                                                    Exhibit 99.1


                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002



     In  connection  with  the  annual  report  of  the  Terex  Corporation  and
Affiliates'  401(k)  Retirement  Savings  Plan for  Represented  Employees  (the
"Plan") on Form 11-K for the period  ending  December 31, 2002 as filed with the
Securities and Exchange Commission on the date hereof (the "Report"),  I, Ronald
M. DeFeo,  Chairman,  President and Chief Executive Officer of Terex Corporation
(the "Company"), certify, to the best of my knowledge, pursuant to 18 U.S.C. ss.
1350, as adopted pursuant to ss. 906 of the Sarbanes-Oxley Act of 2002, that:

(1)  The Report fully complies with the  requirements  of Section 13(a) or 15(d)
     of the Securities Exchange Act of 1934; and

(2)  The information  contained in the Report fairly  presents,  in all material
     respects, the financial condition and results of operations of the Plan.



                                                        /s/ Ronald M. DeFeo
                                                        Ronald M. DeFeo
                                                        Chairman, President and
                                                        Chief Executive Officer
                                                        Terex Corporation

                                                        June 27, 2003









A signed  original of this written  statement  required by Section 906, or other
document authenticating,  acknowledging or otherwise adopting the signature that
appears in typed form within the  electronic  version of this written  statement
required  by Section  906,  has been  provided  to  provided to the Plan and the
Company and will be retained  by the Plan and the Company and  furnished  to the
Securities and Exchange Commission or its staff upon request.

</TEXT>
</DOCUMENT>
