EXHIBIT 4.9




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                                TEREX CORPORATION

                                  $100,000,000

                    8-7/8% Senior Subordinated Notes due 2008

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

                          SECOND SUPPLEMENTAL INDENTURE

                            Dated as of July 30, 1999

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

                    UNITED STATES TRUST COMPANY OF NEW YORK,

                                     Trustee



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                          SECOND SUPPLEMENTAL INDENTURE

                  SECOND  SUPPLEMENTAL  INDENTURE,  dated as of July  30,  1999,
between TEREX CORPORATION,  a Delaware  corporation (the "Company"),  and UNITED
STATES TRUST  COMPANY OF NEW YORK, a New York  banking  corporation,  as trustee
(the "Trustee").

                  WHEREAS, the Company, and Terex Cranes, Inc., Koehring Cranes,
Inc.,  PPM Cranes,  Inc.,  Payhauler  Corp.,  Terex-Telelect  Inc.,  Progressive
Components,  Inc.,  Terex  Aerials,  Inc.,  Terex-Ro  Corporation,  Terex Mining
Equipment,  Inc., O & K Orenstein & Koppel, Inc., The American Crane Corporation
and  Amida  Industries,  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 (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   desires  to  correct  a  defect  or
inconsistency  which does not  adversely  affect the rights of any Holder in any
material respect as provided for in Section 9.01(1) of the Indenture; and

                  WHEREAS,  the  Company,  the  Subsidiary  Guarantors  and  the
Trustee desire to enter into this Second Supplemental Indenture.

                  NOW, THEREFORE, the Company, the Subsidiary Guarantors 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. The proviso contained in Section 2.15(2) shall be deleted
in its entirety and replaced with the  following:  "provided,  however,  that no
Additional  Notes may be issued at a price  which  would  cause such  Additional
Notes to have "original issue  discount"  (within the meaning of Section 1273 of
the Code) materially different from that attributed to the Notes issued on March
9, 1999."

                                    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 terms used in this  Second  Supplemental  Indenture
which are defined in the  Indenture  shall have the  meanings  specified  in the
Indenture,  unless the context of this Second  Supplemental  Indenture otherwise
requires.

         Section 2.03. This Second 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 Second  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 Second  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  Second  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  Second
Supplemental Indenture to be duly executed as of the date first above written.

                                         TEREX CORPORATION



                                         By: /s/ Joseph F. Apuzzo
                                             --------------------
                                         Name:  Joseph F. Apuzzo
ATTEST:                                  Title: Vice President-Corporate Finance
/s/ Eric I Cohen
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Eric I Cohen, Secretary



                                         UNITED STATES TRUST COMPANY
                                           OF NEW YORK, as Trustee


                                         By_________________________
                                         Name:
ATTEST:                                  Title:

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                (Signature Page to Second Supplemental Indenture)


                                         SUBSIDIARY GUARANTORS:

                                         KOEHRING CRANES, INC.



                                         By: /s/ Joseph F. Apuzzo
                                             --------------------
                                          Name:  Joseph F. Apuzzo
ATTEST:                                  Title:     Vice President-Finance
/s/ Eric I Cohen
- --------------------
Eric I Cohen, Secretary


                                         PPM CRANES, INC.


                                         By: /s/ Joseph F. Apuzzo
                                             --------------------
                                         Name:  Joseph F. Apuzzo
ATTEST:                                  Title:     Vice President-Finance
/s/ Eric I Cohen
- ----------------------
Eric I Cohen, Secretary


                                         TEREX-TELELECT INC.


                                         By: /s/ Joseph F. Apuzzo
                                             --------------------
                                         Name: Joseph F. Apuzzo
ATTEST:                                  Title:   Vice President-Finance
/s/ Eric I Cohen
- --------------------
Eric I Cohen, Secretary


                                         TEREX AERIALS INC.


                                         By: /s/ Joseph F. Apuzzo
                                             --------------------
                                         Name:  Joseph F. Apuzzo
ATTEST:                                  Title:    Vice President-Finance
/s/ Eric I Cohen
- ---------------------------
Eric I Cohen, Secretary





                (Signature Page to Second Supplemental Indenture)


                                         THE AMERICAN CRANE CORPORATION


                                         By: /s/ Joseph F. Apuzzo
                                             --------------------
                                         Name: Joseph F. Apuzzo
ATTEST:                                  Title:   Vice President-Finance
/s/ Eric I Cohen
- ----------------------
Eric I Cohen, Secretary


                                         TEREX-RO CORPORATION


                                         By: /s/ Joseph F. Apuzzo
                                             --------------------
                                         Name: Joseph F. Apuzzo
ATTEST:                                  Title: Vice President-Finance


/s/ Eric I Cohen
- ---------------------
Eric I Cohen, Secretary



                                         TEREX CRANES, INC.


                                         By: /s/ Joseph F. Apuzzo
                                             --------------------
                                         Name:  Joseph F. Apuzzo
ATTEST:                                  Title:     Vice President and Treasurer
/s/ Eric I Cohen
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Eric I Cohen, Secretary



                                         PAYHAULER CORP.


                                         By: /s/ Joseph F. Apuzzo
                                             --------------------
                                         Name: Joseph F. Apuzzo
ATTEST:                                  Title:   Vice President and Treasurer

/s/ Eric I Cohen
- ---------------------
Eric I Cohen, Secretary





                (Signature Page to Second Supplemental Indenture)

                                         PROGRESSIVE COMPONENTS INC.


                                         By: /s/ Joseph F. Apuzzo
                                             --------------------
                                         Name: Joseph F. Apuzzo
ATTEST:                                  Title:    Vice President-Finance
/s/ Eric I Cohen
- ---------------------
Eric I Cohen, Secretary


                                         AMIDA INDUSTRIES, INC.


                                        By: /s/ Joseph F. Apuzzo
                                             --------------------
                                         Name:  Joseph F. Apuzzo
ATTEST:                                  Title:    Treasurer
/s/ Eric I Cohen
- ---------------------
Eric I Cohen, Secretary

                                         TEREX MINING EQUIPMENT, INC.


                                         By: /s/ Joseph F. Apuzzo
                                             --------------------
                                         Name:  Joseph F. Apuzzo
ATTEST:                                  Title:    Treasurer
/s/ Eric I Cohen
- ---------------------
Eric I Cohen, Secretary

                                         O & K  ORENSTEIN & KOPPEL, INC.


                                         By: /s/ Joseph F. Apuzzo
                                             --------------------
                                         Name:  Joseph F. Apuzzo
ATTEST:                                  Title:    Treasurer
/s/ Eric I Cohen
- ---------------------
Eric I Cohen, Secretary