EXHIBIT 32

CERTIFICATION OF CEO AND CFO 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 quarterly report of Bucyrus International, Inc. (the “Company”) on Form 10-Q for the period ended June 30, 2009, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Timothy W. Sullivan, as President and Chief Executive Officer of the Company, and Craig R. Mackus, Chief Financial Officer and Secretary of the Company, each hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of his knowledge:

(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 Company.

/s/ T. W. Sullivan

Timothy W. Sullivan

President and Chief Executive Officer

August 10, 2009

/s/ C. R. Mackus

Craig R. Mackus

Chief Financial Officer and Secretary

August 10, 2009

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