UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

AMENDMENT NO. 9

TO

SCHEDULE TO

Tender Offer Statement under Section 14(d)(1) or 13(e)(1)

of the Securities Exchange Act of 1934

GEHL COMPANY

(Name of Subject Company (Issuer))

Tenedor Corporation

and

Manitou BF S.A.

(Names of Filing Persons (Offerors))

Common Stock, par value $0.10 per share

(Title of Class of Securities)

368483103

(CUSIP Number of Class of Securities)

Marcel Claude Braud

Bruno Fille

Manitou BF S.A.

Tenedor Corporation

Z1 430 Route l’Aubiniere

BP 249

Ancenis Cedex, France 44158

+33 (2) 40-09-10-11

(Name, Address and Telephone Numbers of Person Authorized

to Receive Notices and Communications on Behalf of Filing Persons)

Copy to:

Ethan A. Klingsberg, Esq.

Cleary Gottlieb Steen & Hamilton LLP

One Liberty Plaza

New York, New York 10006

(212) 225-2000

CALCULATION OF FILING FEE

Check the appropriate boxes below to designate any transactions to which the statement relates:

Check the following box if the filing is a final amendment reporting the results of the tender offer:  ¨

This Amendment No. 9 to Schedule TO (this “Amendment No. 9”) amends and supplements the Tender Offer Statement, Rule 13e-3 Transaction Statement and amended Schedule 13D Beneficial Ownership Statement initially filed with the Securities and Exchange Commission on September 8, 2008 on Schedule TO, as previously amended (the “Schedule TO”). This Amendment No. 9 and the Schedule TO relate to the offer by Tenedor Corporation, a Wisconsin corporation (“Purchaser”) and a direct wholly-owned subsidiary of Manitou BF S.A., a French limited company (Société Anonyme) (“Parent”), to purchase all outstanding shares of common stock, par value $0.10 per share (the “Shares”), of Gehl Company, a Wisconsin corporation (the “Company”), at a price of $30.00 per Share, net to the seller in cash, without interest thereon and less any required withholding taxes, upon the terms and subject to the conditions set forth in the Offer to Purchase dated September 7, 2008 and in the related Letter of Transmittal (which, together with any amendments or supplements thereto, collectively constitute the “Offer”), which are annexed to and filed with the Schedule TO as Exhibits (a)(1)(A) and (a)(1)(B), respectively.

This Amendment No. 9 and Schedule TO also relate to the Agreement and Plan of Merger, dated as of September 7, 2008, among Parent, Purchaser and the Company pursuant to which, after the completion of the Offer and the satisfaction or waiver of certain conditions, Purchaser will be merged with and into the Company and the Company will be the surviving corporation and a subsidiary of Parent.

This Amendment No. 9 is being filed on behalf of Parent and Purchaser to amend and supplement Items 1 and 4 of the Schedule TO and to amend and supplement the exhibit index in order to file additional material as an exhibit to the Schedule TO.

Item 1 is amended and supplemented by replacing the last sentence in the first paragraph under the question “What Are the Most Important Conditions to the Offer?” under the subsection entitled “Summary Term Sheet—Questions and Answers” (on page 3 of the Offer to Purchase) with the following text:

We estimate based on the number of outstanding Shares as of October 13, 2008, approximately 6,293,219 Shares not owned beneficially by Parent, Purchaser or their respective wholly-owned subsidiaries would have to be tendered in order to satisfy the non-waivable Minimum Tender Condition (after giving effect to the cancellation of outstanding awards of restricted stock under any of the Company Stock Plans that have not previously vested immediately prior to the acceptance by Purchaser for payment of the Shares tendered pursuant to the Offer).

Item 4 is amended and supplemented by replacing the sixth paragraph under the section entitled “Introduction” (on pages 8 and 9 of the Offer to Purchase) with the following text:

The Offer is subject to the non-waivable condition that there shall have been validly tendered and not properly withdrawn before the Offer expires that number of Shares which, together with the number of Shares, if any, then owned beneficially by Parent, Purchaser and their respective wholly-owned subsidiaries, constitutes at least a number of Shares equal to the sum of (i) the number of Shares that represents two-thirds of the voting power of the total number of then-outstanding Shares entitled to vote on a fully diluted basis (after giving effect to the cash-out of options and restricted shares that will occur in connection with Purchaser’s acceptance of the tendered Shares) plus (ii) one Share entitled to vote. If the Minimum Tender Condition is not satisfied, the Offer will be terminated, and all Shares previously tendered will be returned to tendering shareholders. If the Minimum Tender Condition is satisfied and the Offer is consummated, Parent is obligated to cause the consummation of the Merger as soon as practicable thereafter and after satisfaction or waiver of the conditions to the Merger set forth in the Merger Agreement. Purchaser estimates that, based on the number of outstanding Shares as of October 13, 2008, approximately 6,293,219 Shares not owned beneficially by Parent, Purchaser or their respective wholly-owned subsidiaries would have to be tendered in order to satisfy the non-waivable Minimum Tender Condition (after giving effect to the cancellation of outstanding awards of restricted stock under any of the Company Stock Plans that have not previously vested immediately prior to the acceptance by Purchaser for payment of the Shares tendered pursuant to the Offer). The offer is subject to certain additional conditions. See “Other Matters Relating to the Offer and the Merger—Certain Conditions to the Offer.” Purchaser has expressly reserved the right to amend or make changes to the terms and conditions of the Offer, provided that, without the prior written consent of the Company, Purchaser will not do any of the following: (i) decrease the Offer Price or change the form of consideration payable in the Offer; (ii) decrease the number of Shares to be purchased by Purchaser pursuant to the Offer; (iii) amend or waive the Minimum Tender Condition; (iv) add to the conditions to the Offer specified in the Merger Agreement (see “Other Matters Relating to the Offer and the Merger—Certain Conditions to the Offer”); (v) modify the conditions to the Offer in a manner materially adverse to the holders of Shares; or (vi) extend the expiration date of the Offer except as required or permitted by the Merger Agreement.

Item 12 is amended and supplemented to include the following exhibit:

SIGNATURE

After due inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Dated: October 14, 2008

EXHIBIT INDEX