FOURTH SUPPLEMENTAL INDENTURE


                  FOURTH  SUPPLEMENTAL  INDENTURE,  dated as of March __,  2001,
between  TEREX  CORPORATION,   a  Delaware  corporation  (the  "Company"),   the
SUBSIDIARY  GUARANTORS (as defined below) and UNITED STATES TRUST COMPANY OF NEW
YORK, a New York corporation, as trustee (the "Trustee").

                  WHEREAS, the Company, and Terex Cranes, Inc., Koehring Cranes,
Inc.,  PPM  Cranes,  Inc.,   Payhauler  Corp.,   Terex-Telelect  Inc.,  Terex-Ro
Corporation,  Terex Mining Equipment,  Inc., O & K Orenstein & Koppel, Inc., The
American Crane  Corporation,  Amida Industries,  Inc., and Cedarapids,  Inc., as
guarantors  (collectively,  the  "Subsidiary  Guarantors"),  and the Trustee are
parties  to an  Indenture  dated  as of  March  9,  1999,  as  amended  by First
Supplemental  Indenture  dated as of April 1, 1999,  and as  further  amended by
Second  Supplemental  Indenture dated as of July 29, 1999, as further amended by
Third Supplemental Indenture dated as of August 26, 1999 (said Indenture,  as it
may  heretofore  or  hereafter  from time to time be amended,  the  "Indenture")
providing for the issuance of the Company's 8-7/8% Senior Subordinated Notes due
2008 (the "Notes");

                  WHEREAS,  the  Company  has  acquired  all of the  outstanding
capital  stock  of  BL-Pegson  (USA),  Inc.,  Benford  America,   Inc.,  Coleman
Engineering,  Inc., EarthKing,  Inc., Finlay Hydrascreen USA, Inc.,  Powerscreen
Holdings USA, Inc.,  Powerscreen  International LLC,  Powerscreen North America,
Inc.,  Powerscreen USA, LLC, Royer  Industries,  Inc.,  Standard  Havens,  Inc.,
Standard Havens Products,  Inc. and Terex Bartell,  Inc. (each  individually,  a
"New Subsidiary") and collectively, the "New Subsidiaries");

                  WHEREAS,  pursuant  to the  terms  of the  Indenture,  the New
Subsidiaries each have become a Restricted  Subsidiary  organized under the laws
of the United States and, as such,  the Company is required to cause each of the
New  Subsidiaries  to  execute  and  deliver a  supplemental  indenture  and the
Subsidiary Guarantee endorsed on the Notes; and

                  WHEREAS,  the  Company,  the  Subsidiary  Guarantors  and  the
Trustee desire to amend the Indenture to add the New  Subsidiaries as Subsidiary
Guarantors under the Indenture.

                  NOW, THEREFORE,  the Company, the Subsidiary  Guarantors,  the
New  Subsidiaries  and the  Trustee  agree as follows  for the equal and ratable
benefit of the Holders of the Notes.

                                    ARTICLE 1
                           AMENDMENT TO THE INDENTURE

                  Section 1.01. Each New Subsidiary agrees to be bound under the
Indenture  effective as of the date hereof, and as such shall be entitled to all
the benefits and be subject to all the  obligations,  of a Subsidiary  Guarantor
thereunder.  Each  of the New  Subsidiaries  agrees  to be  bound  by all  those
provisions of the Indenture binding upon a Subsidiary Guarantor.




                                    ARTICLE 2
                                  MISCELLANEOUS

                  Section 2.01. The supplement to the Indenture  effected hereby
shall be binding upon all Holders of the Notes,  their  transferees and assigns.
All  Notes  issued  and  outstanding  on the  date  hereof  shall be  deemed  to
incorporate  by reference or include the  supplement to the  Indenture  effected
hereby.

                  Section 2.02.  All  capitalized  terms used but not defined in
this Fourth Supplemental Indenture which are defined in the Indenture shall have
the  meanings  specified  in the  Indenture,  unless the  context of this Fourth
Supplemental Indenture otherwise requires.

                  Section 2.03. This Fourth Supplemental  Indenture shall become
a binding agreement between the parties when counterparts hereof shall have been
executed and delivered by each of the parties hereto.

                  Section  2.04.  This Fourth  Supplemental  Indenture  shall be
construed,  interpreted  and the rights of the parties  determined in accordance
with the  laws of the  State of New  York,  as  applied  to  contracts  made and
performed  within  the  State of New  York,  without  regard  to  principles  of
conflicts of law.

                  Section  2.05.  This  Fourth  Supplemental  Indenture  may  be
executed in several counterparts,  each of which shall be an original and all of
which shall constitute but one and the same amendment.

                  Section   2.06.   The   recitals   contained  in  this  Fourth
Supplemental Indenture are made by the Company and not by the Trustee and all of
the provisions contained in the Indenture, in respect of the rights, privileges,
immunities,  powers and duties of the  Trustee  shall be  applicable  in respect
thereof as fully and with like effect as if set forth herein in full.







         IN WITNESS WHEREOF, the parties hereto have caused this Fourth
Supplemental Indenture to be duly executed as of the date first above written.


                                            TEREX CORPORATION


                                            By:___________________________
                                                  Eric I Cohen
                                                  Senior Vice President


                                            UNITED STATES TRUST COMPANY
                                            OF NEW YORK, as Trustee


                                            By_________________________
                                                 Name:
                                                 Title:








                                            SUBSIDIARY GUARANTORS:



                                            KOEHRING CRANES, INC.


                                            By:___________________________
                                                  Name:  Eric I Cohen
                                                  Title:  Vice President


                                            PAYHAULER CORP.


                                            By:___________________________
                                                  Name:  Eric I Cohen
                                                  Title:  Vice President


                                            PPM CRANES, INC.


                                            By:___________________________
                                                  Name:  Eric I Cohen
                                                  Title:  Vice President


                                            TEREX CRANES, INC.


                                            By:___________________________
                                                  Name:  Eric I Cohen
                                                  Title:  Vice President


                                            TEREX MINING EQUIPMENT, INC.


                                            By:___________________________
                                                 Name: Eric I Cohen
                                                 Title:  Vice President


                                            TEREX-RO CORPORATION


                                            By:___________________________
                                                  Name:  Eric I Cohen
                                                  Title:  Vice President



                                            TEREX-TELELECT, INC.


                                            By:___________________________
                                                  Name:  Eric I Cohen
                                                  Title:  Vice President


                                            THE AMERICAN CRANE CORPORATION


                                            By:__________________________
                                                  Name:  Eric I Cohen
                                                  Title:  Vice President


                                            O&K ORENSTEIN & KOPPEL, INC.

                                            By:__________________________
                                                  Name:  Eric I Cohen
                                                  Title:  Vice President


                                            AMIDA INDUSTRIES, INC.

                                            By:__________________________
                                                  Name:  Eric I Cohen
                                                  Title:  Vice President


                                            CEDARAPIDS, INC.


                                            By:___________________________
                                                  Name:  Eric I Cohen
                                                  Title:  Vice President


                                            STANDARD HAVENS, INC.


                                            By:___________________________
                                                  Name: Eric I Cohen
                                                  Title: Vice President







                                            STANDARD HAVENS PRODUCTS, INC.


                                            By:___________________________
                                                  Name: Eric I Cohen
                                                  Title: Vice President


                                            BL-PEGSON (USA), INC.


                                            By:___________________________
                                                  Name: Eric I Cohen
                                                  Title: Vice President


                                            BENFORD AMERICA, INC.


                                            By:___________________________
                                                 Name: Eric I Cohen
                                                 Title: Vice President


                                            COLEMAN ENGINEERING, INC.


                                            By:___________________________
                                                  Name: Eric I Cohen
                                                  Title: Vice President


                                            EARTHKING, INC.


                                            By:___________________________
                                                  Name: Eric I Cohen
                                                  Title: Secretary


                                            FINLAY HYDRASCREEN USA, INC.


                                            By:___________________________
                                                  Name: Eric I Cohen
                                                  Title: Vice President


                                            POWERSCREEN HOLDINGS USA, INC.


                                            By:___________________________
                                                  Name: Eric I Cohen
                                                  Title: Vice President



                                            POWERSCREEN INTERNATIONAL LLC


                                            By:___________________________
                                                  Name: Eric I Cohen
                                                  Title: Vice President


                                            POWERSCREEN NORTH AMERICA, INC.


                                            By:___________________________
                                                  Name: Eric I Cohen
                                                  Title: Vice President


                                            POWERSCREEN USA, LLC


                                            By:___________________________
                                                  Name: Eric I Cohen
                                                  Title: Vice President


                                            ROYER INDUSTRIES, INC.


                                            By:___________________________
                                                  Name: Eric I Cohen
                                                  Title: Vice President


                                            TEREX BARTELL, INC.


                                            By:___________________________
                                                  Name: Eric I Cohen
                                                  Title: Vice President













                                TEREX CORPORATION

                                  $100,000,000

                    8-7/8% Senior Subordinated Notes due 2008

                        ---------------------------------

                          FOURTH SUPPLEMENTAL INDENTURE

                           Dated as of March __, 2001

                        --------------------------------

                    UNITED STATES TRUST COMPANY OF NEW YORK,

                                     Trustee