1 



                           GUARANTEE  AGREEMENT  dated  as  of  March  6,  1998,
                  between TEREX CORPORATION,  a Delaware corporation  ("Terex"),
                  and CREDIT SUISSE FIRST  BOSTON,  a bank  organized  under the
                  laws  of  Switzerland,  acting  through  its New  York  branch
                  ("CSFB"), as collateral agent (the "Collateral Agent") for the
                  Secured Parties (as defined in the Credit  Agreement  referred
                  to below).

         Reference is made to (a) the Credit Agreement dated as of March 6, 1998
(as amended,  supplemented or otherwise  modified from time to time, the "Credit
Agreement"), among Terex, Terex Equipment Limited, a company organized under the
laws of  Scotland,  P.P.M.  S.A.,  a  company  organized  under  the laws of the
Republic of France,  Unit Rig (Australia)  Pty. Ltd., a company  organized under
the laws of New South Wales, and P.P.M.  S.p.A.,  a company  organized under the
laws of the  Republic  of Italy,  the Lenders (as defined in Article I thereto),
the Issuing Banks (as defined in Article I thereto) and CSFB, as  administrative
agent and as collateral  agent for the Lenders and (b) the  Guarantee  Agreement
dated as of March 6, 1998 (as amended,  supplemented or otherwise  modified from
time to time, the "Subsidiary  Guarantee  Agreement")  among the subsidiaries of
Terex  listed  on  Schedule  I thereto  (the  "Subsidiary  Guarantors")  and the
Collateral  Agent.  Capitalized  terms used herein and not defined  herein shall
have the meanings assigned to such terms in the Credit Agreement.

         The Lenders have agreed to make Loans to the Borrowers, and the Issuing
Banks have agreed to issue  Letters of Credit for the account of the  Borrowers,
pursuant to, and upon the terms and subject to the conditions  specified in, the
Credit Agreement.  Each of the Subsidiary Borrowers is a wholly owned Subsidiary
of Terex and Terex acknowledges that it will derive substantial benefit from the
making of the Loans by the Lenders to the Subsidiary Borrowers, and the issuance
of the  Letters of Credit for the  account of the  Subsidiary  Borrowers  by the
Issuing  Banks.  The  obligations of the Lenders to make Loans to the Subsidiary
Borrowers and of the Issuing Banks to issue Letters of Credit for the account of
the Subsidiary  Borrowers are conditioned on, among other things,  the execution
and  delivery  by  Terex  of a  Guarantee  Agreement  in  the  form  hereof.  As
consideration  therefor  and in order to induce the Lenders to make Loans to the
Subsidiary  Borrowers  and the Issuing  Banks to issue Letters of Credit for the
account of the Subsidiary Borrowers, Terex is willing to execute this Agreement.

         Accordingly, the parties hereto agree as follows:

         SECTION 1. Guarantee.  Terex unconditionally  guarantees,  as a primary
obligor and not merely as a surety,  (a) the due and punctual payment of (i) the
principal of and premium,  if any, and  interest  (including  interest  accruing
during the pendency of any bankruptcy, insolvency, receivership or other similar
proceeding,  regardless of whether  allowed or allowable in such  proceeding) on
the Loans,  when and as due, whether at maturity,  by acceleration,  upon one or
more dates set for  prepayment  or otherwise,  (ii) each payment  required to be
made by any  Borrower  under the  Credit  Agreement  in respect of any Letter of
Credit,  when and as due,  including  payments  in respect of  reimbursement  of
disbursements,  interest  thereon and obligations to provide cash collateral and
(iii) all other  monetary  obligations,  including  fees,  costs,  expenses  and
indemnities,  whether primary, secondary, direct, contingent, fixed or otherwise
(including monetary  obligations incurred during the pendency of any bankruptcy,
insolvency,  receivership  or other  similar  proceeding,  regardless of whether
allowed or  allowable  in such  proceeding),  of the Loan Parties to the Secured
Parties under the Credit Agreement and the other Loan Documents, (b) the due and
punctual performance of all covenants,  agreements,  obligations and liabilities
of the Loan Parties under or pursuant to the Credit Agreement and the other Loan
Documents and (c) all obligations of any Borrower,  monetary or otherwise, under
each Hedging Agreement entered into with a counterparty that was a Lender (or an
Affiliate  thereof) at the time such Hedging Agreement was entered into (all the
monetary and other obligations  referred to in the preceding clauses (a) through
(c) being collectively called the "Obligations").  Terex further agrees that the
Obligations may be extended or renewed,  in whole or in part,  without notice to
or further  assent  from it, and that it will  remain  bound upon its  guarantee
notwithstanding any extension or renewal of any Obligation.


                                       2

         SECTION 2.  Obligations Not Waived.  To the fullest extent permitted by
applicable law, Terex waives  presentment to, demand of payment from and protest
to the Subsidiary Borrowers of any of the Obligations, and also waives notice of
acceptance of its guarantee and notice of protest for nonpayment. To the fullest
extent permitted by applicable law, the obligations of Terex hereunder shall not
be  affected  by (a) the failure of the  Collateral  Agent or any other  Secured
Party to  assert  any claim or demand or to  enforce  or  exercise  any right or
remedy against any Subsidiary  Borrower or any  Subsidiary  Guarantor  under the
provisions of the Credit  Agreement,  the Subsidiary  Guarantee  Agreement,  any
other Loan  Document or  otherwise,  (b) any  rescission,  waiver,  amendment or
modification  of, or any  release  from any of the terms or  provisions  of this
Agreement,  any other  Loan  Document,  any  Guarantee  or any other  agreement,
including  with  respect  to  any  Subsidiary  Guarantor  under  the  Subsidiary
Guarantee  Agreement or (c) the failure to perfect any security  interest in, or
the release of, any of the security held by or on behalf of the Collateral Agent
or any other Secured Party.

         SECTION 3. Security.  Terex authorizes the Collateral Agent and each of
the other Secured Parties, to (a) take and hold security for the payment of this
Guarantee and the Obligations and exchange,  enforce, waive and release any such
security,  (b)  apply  such  security  and  direct  the  order or manner of sale
thereof,  in accordance with the terms of the Loan  Documents,  as they in their
sole  discretion  may determine  and (c) release or  substitute  any one or more
endorsees, other guarantors of other obligors.

         SECTION  4.  Guarantee  of  Payment.  Terex  further  agrees  that  its
guarantee constitutes a guarantee of payment when due and not of collection, and
waives any right to require  that any resort be had by the  Collateral  Agent or
any  other  Secured  Party  to any of  the  security  held  for  payment  of the
Obligations  or to any balance of any deposit  account or credit on the books of
the  Collateral  Agent or any  other  Secured  Party in favor of any  Subsidiary
Borrower or any other person.

         SECTION 5. No Discharge or Diminishment  of Guarantee.  The obligations
of Terex hereunder shall not be subject to any reduction, limitation, impairment
or termination  for any reason (other than the  indefeasible  payment in full in
cash of the  Obligations),  including any claim of waiver,  release,  surrender,
alteration or compromise of any of the Obligations,  and shall not be subject to
any defense or setoff,  counterclaim,  recoupment or  termination  whatsoever by
reason of the invalidity,  illegality or  unenforceability of the Obligations or
otherwise.  Without limiting the generality of the foregoing, the obligations of
Terex hereunder shall not be discharged or impaired or otherwise affected by the
failure of the  Collateral  Agent or any other Secured Party to assert any claim
or demand or to enforce any remedy  under the Credit  Agreement,  any other Loan
Document or any other agreement,  by any waiver or modification of any provision
of any thereof, by any default,  failure or delay,  wilful or otherwise,  in the
performance  of the  Obligations,  or by any other act or  omission  that may or
might in any  manner  or to any  extent  vary  the  risk of Terex or that  would
otherwise  operate as a discharge  of Terex as a matter of law or equity  (other
than the indefeasible payment in full in cash of all the Obligations).

         SECTION 6.  Defenses of  Subsidiary  Borrowers  Waived.  To the fullest
extent permitted by applicable law, Terex waives any defense based on or arising
out of any defense of the Subsidiary  Borrowers or the  unenforceability  of the
Obligations or any part thereof from any cause,  or the cessation from any cause
of the  liability of any  Subsidiary  Borrower,  other than the final payment in
full in cash of the  Obligations.  The  Collateral  Agent and the other  Secured
Parties may, at their election, foreclose on any security held by one or more of
them by one or more judicial or nonjudicial  sales,  accept an assignment of any
such  security  in lieu of  foreclosure,  compromise  or adjust  any part of the
Obligations,  make any other  accommodation  with any Subsidiary  Borrower,  any
Subsidiary  Guarantor  or any other  guarantor  or  exercise  any other right or
remedy  available  to them  against  any  Subsidiary  Borrower,  any  Subsidiary
Guarantor or any other guarantor,  without affecting or impairing in any way the
liability  of Terex  hereunder  except to the extent the  Obligations  have been
fully and finally paid in cash or otherwise  satisfied  pursuant to the terms of
the Loan Documents. Pursuant to applicable law, Terex waives any defense arising
out of any such  election  even  though  such  election  operates,  pursuant  to
applicable law, to impair or to extinguish any right of reimbursement or


                                       3


other right or remedy of Terex against any Subsidiary  Borrower,  any Subsidiary
Guarantor or any other guarantor, as the case may be, or any security.

         SECTION 7.  Agreement  to Pay;  Subordination.  In  furtherance  of the
foregoing and not in limitation of any other right that the Collateral  Agent or
any other Secured Party has at law or in equity  against Terex by virtue hereof,
upon the failure of any  Subsidiary  Borrower or any other Loan Party to pay any
Obligation  when and as the same  shall  become  due,  whether at  maturity,  by
acceleration,  after notice of prepayment or otherwise, Terex hereby promises to
and will  forthwith  pay, or cause to be paid, to the  Collateral  Agent or such
other  Secured  Party as  designated  thereby in cash the amount of such  unpaid
Obligations.  Upon payment by Terex of any sums to the  Collateral  Agent or any
Secured  Party as provided  above,  all rights of Terex  against any  Subsidiary
Borrower   arising  as  a  result  thereof  by  way  of  right  of  subrogation,
contribution,  reimbursement,  indemnity or  otherwise  shall in all respects be
subordinate  and junior in right of payment to the prior payment in full in cash
of all the Obligations. In addition, any indebtedness of any Subsidiary Borrower
now or hereafter held by Terex is hereby subordinated in right of payment to the
prior payment in full of the  Obligations.  If any amount shall  erroneously  be
paid to Terex on account of (i) such subrogation,  contribution,  reimbursement,
indemnity  or  similar  right or (ii) any such  indebtedness  of any  Subsidiary
Borrower, and if an Event of Default shall have occurred and be continuing, such
amount  shall be held in trust for the benefit of the Secured  Parties and shall
forthwith be paid to the Collateral  Agent to be credited against the payment of
the Obligations,  whether matured or unmatured,  in accordance with the terms of
the Loan Documents.

         SECTION 8. Information.  Terex assumes all responsibility for being and
keeping itself  informed of the Subsidiary  Borrowers'  financial  condition and
assets,  and of all other  circumstances  bearing upon the risk of nonpayment of
the Obligations and the nature, scope and extent of the risks that Terex assumes
and incurs hereunder,  and agrees that none of the Collateral Agent or the other
Secured Parties will have any duty to advise Terex of information known to it or
any of them regarding such circumstances or risks.

         SECTION 9.  Representations and Warranties.  INTENTIONALLY OMITTED

         SECTION  10.  Termination.  The  Guarantee  made  hereunder  (a)  shall
terminate when all the  Obligations  have been paid in full and the Lenders have
no  further  commitment  to lend to any  Subsidiary  Borrowers  under the Credit
Agreement, the L/C Exposure with respect to all Letters of Credit issued for the
account of any  Subsidiary  Borrower  has been  reduced to zero and the  Issuing
Banks have no further  obligation to issue  Letters of Credit to any  Subsidiary
Borrower under the Credit  Agreement and (b) shall be reinstated if, at any time
after  the  Guarantee  has  terminated,  payment,  or any part  thereof,  of any
Obligation  is rescinded or must  otherwise be restored by any Secured  Party or
any Subsidiary Guarantor upon the bankruptcy or reorganization of any Subsidiary
Borrower, any Subsidiary Guarantor, Terex or otherwise.

         SECTION 11. Binding Effect; Several Agreement; Assignments. Whenever in
this Agreement any of the parties hereto is referred to, such reference shall be
deemed to include the successors  and assigns of such party;  and all covenants,
promises  and  agreements  by or on behalf of Terex that are  contained  in this
Agreement  shall bind and inure to the  benefit  of each party  hereto and their
respective  successors and assigns.  This Agreement shall become effective as to
Terex when a  counterpart  hereof  executed  on behalf of Terex  shall have been
delivered to the  Collateral  Agent,  and a  counterpart  hereof shall have been
executed on behalf of the Collateral Agent, and thereafter shall be binding upon
Terex and the Collateral Agent and their respective  successors and assigns, and
shall inure to the benefit of Terex,  the Collateral Agent and the other Secured
Parties,  and their  respective  successors and assigns,  except Terex shall not
have the right to assign its rights or  obligations  hereunder  or any  interest
herein (and any such attempted assignment shall be void).

          SECTION  12.  Waivers;  Amendment.  (a) No  failure  or  delay  of the
Collateral  Agent in exercising any power or right  hereunder shall operate as a
waiver  thereof,  nor shall any single or partial  exercise of any such right or
power, or any abandonment or discontinuance of steps to enforce such a right or


                                       4

power,  preclude  any other or further  exercise  thereof or the exercise of any
other right or power.  The rights and remedies of the Collateral Agent hereunder
and of the other Secured  Parties under the other Loan  Documents are cumulative
and are not exclusive of any rights or remedies that they would  otherwise have.
No waiver of any  provision  of this  Agreement  or consent to any  departure by
Terex  therefrom  shall  in any  event be  effective  unless  the same  shall be
permitted  by  paragraph  (b) below,  and then such  waiver or consent  shall be
effective only in the specific  instance and for the purpose for which given. No
notice  or  demand  on Terex in any case  shall  entitle  Terex to any  other or
further notice or demand in similar or other circumstances.

         (b) Neither  this  Agreement  nor any  provision  hereof may be waived,
amended or modified except pursuant to a written  agreement entered into between
Terex and the Collateral  Agent,  with the prior written consent of the Required
Lenders (except as otherwise provided in the Credit Agreement).

          SECTION 13.  Governing Law. THIS  AGREEMENT  SHALL BE GOVERNED BY, AND
CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

          SECTION 14. Notices. All communications and notices hereunder shall be
in writing and given as provided in Section 9.01 of the Credit Agreement.

          SECTION 15.  Survival of Agreement;  Severability.  (a) All covenants,
agreements,  representations  and  warranties  made by Terex  herein  and in the
certificates  or other  instruments  prepared or delivered in connection with or
pursuant to this  Agreement or any other Loan  Document  shall be  considered to
have been relied upon by the Collateral  Agent and the other Secured Parties and
shall survive the making by the Lenders of the Loans to the Subsidiary Borrowers
and the  issuance  of the  Letters of Credit for the  account of the  Subsidiary
Borrowers  by the Issuing  Banks  regardless  of any  investigation  made by the
Secured Parties or on their behalf,  and shall continue in full force and effect
as  long  as the  principal  of or any  accrued  interest  on  any  Loan  to the
Subsidiary  Borrowers or any other fee or amount payable under this Agreement or
any other Loan Document by the Subsidiary Borrowers is outstanding and unpaid or
the L/C Exposure with respect to Letters of Credit issued for the account of all
Subsidiary  Borrowers does not equal zero and as long as the Commitments and the
L/C Commitments have not been terminated.

         (b) In the event any one or more of the  provisions  contained  in this
Agreement  or in any other  Loan  Document  should be held  invalid,  illegal or
unenforceable in any respect,  the validity,  legality and enforceability of the
remaining  provisions  contained  herein  and  therein  shall  not in any way be
affected  or impaired  thereby (it being  understood  that the  invalidity  of a
particular  provision  in a particular  jurisdiction  shall not in and of itself
affect the validity of such  provision in any other  jurisdiction).  The parties
shall  endeavor in good-faith  negotiations  to replace the invalid,  illegal or
unenforceable  provisions  with valid  provisions  the economic  effect of which
comes as close as  possible  to that of the  invalid,  illegal or  unenforceable
provisions.

         SECTION  16.   Counterparts.   This   Agreement   may  be  executed  in
counterparts,  each of which shall constitute an original, but all of which when
taken together shall constitute a single contract, and shall become effective as
provided in Section 11. Delivery of an executed signature page to this Agreement
by  facsimile  transmission  shall be as  effective  as  delivery  of a manually
executed counterpart of this Agreement.

          SECTION  17.  Rules of  Interpretation.  The  rules of  interpretation
specified in Section 1.02 of the Credit  Agreement  shall be  applicable to this
Agreement.

         SECTION  18.  Jurisdiction;  Consent to Service of  Process.  (a) Terex
hereby irrevocably and unconditionally  submits, for itself and its property, to
the  nonexclusive  jurisdiction  of any New York State court or Federal court of
the United States of America  sitting in New York City, and any appellate  court
from any thereof, in any action or proceeding arising out of or relating to this


                                       5

Agreement or the other Loan Documents,  or for recognition or enforcement of any
judgment,  and each of the parties hereto hereby irrevocably and unconditionally
agrees that all claims in respect of any such action or proceeding  may be heard
and  determined  in such New York State or, to the extent  permitted  by law, in
such Federal  court.  Each of the parties hereto agrees that a final judgment in
any such action or proceeding  shall be conclusive  and may be enforced in other
jurisdictions  by suit on the judgment or in any other  manner  provided by law.
Nothing in this Agreement  shall affect any right that the  Collateral  Agent or
any other  Secured  Party may  otherwise  have to bring any action or proceeding
relating to this  Agreement  or the other Loan  Documents  against  Terex or its
properties in the courts of any jurisdiction.

         (b) Terex hereby irrevocably and unconditionally waives, to the fullest
extent it may legally and  effectively  do so, any objection  that it may now or
hereafter have to the laying of venue of any suit, action or proceeding  arising
out of or relating to this Agreement or the other Loan Documents in any New York
State or Federal court. Each of the parties hereto hereby irrevocably waives, to
the fullest extent permitted by law, the defense of an inconvenient forum to the
maintenance of such action or proceeding in any such court.

         (c) Each party to this  Agreement  irrevocably  consents  to service of
process in the manner  provided  for  notices  in  Section  14.  Nothing in this
Agreement  will affect the right of any party to this Agreement to serve process
in any other manner permitted by law.

         SECTION 19. Waiver of Jury Trial.  EACH PARTY HERETO HEREBY WAIVES,  TO
THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY RIGHT IT MAY HAVE TO A TRIAL
BY JURY IN RESPECT OF ANY  LITIGATION  DIRECTLY  OR  INDIRECTLY  ARISING OUT OF,
UNDER OR IN CONNECTION  WITH THIS  AGREEMENT OR THE OTHER LOAN  DOCUMENTS.  EACH
PARTY  HERETO (A)  CERTIFIES  THAT NO  REPRESENTATIVE,  AGENT OR ATTORNEY OF ANY
OTHER PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD
NOT, IN THE EVENT OF  LITIGATION,  SEEK TO ENFORCE THE FOREGOING  WAIVER AND (B)
ACKNOWLEDGES  THAT IT AND THE OTHER  PARTIES  HERETO HAVE BEEN  INDUCED TO ENTER
INTO THIS AGREEMENT AND THE OTHER LOAN DOCUMENTS, AS APPLICABLE, BY, AMONG OTHER
THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS SECTION 19.

         SECTION 20. Right of Setoff. If an Event of Default shall have occurred
and be continuing,  each Secured Party is hereby authorized at any time and from
time to time, to the fullest  extent  permitted by law, to set off and apply any
and all deposits (general or special,  time or demand,  provisional or final) at
any time held and other  Indebtedness at any time owing by such Secured Party to
or for the credit or the account of Terex against any or all the  obligations of
Terex  now or  hereafter  existing  under  this  Agreement  and the  other  Loan
Documents  held by such  Secured  Party,  irrespective  of  whether  or not such
Secured Party shall have made any demand under this  Agreement or any other Loan
Document and although  such  obligations  may be  unmatured.  The rights of each
Secured Party under this Section 20 are in addition to other rights and remedies
(including other rights of setoff) which such Secured Party may have.


         IN  WITNESS  WHEREOF,  the  parties  hereto  have  duly  executed  this
Agreement as of the day and year first above written.

                                        TEREX CORPORATION,

                                         by
                                           Name:
                                           Title:  Authorized Officer


                                       6



                                        CREDIT SUISSE FIRST BOSTON, as
                                        Collateral Agent,

                                         by
                                           Name:
                                           Title:


                                         by
                                           Name:
                                           Title: