Document:

<PAGE>

                                                                   Exhibit 10.18

                                    AMENDMENT

         THIS AMENDMENT, dated as of December 21, 1999 (the "Amendment") is to
the Consulting Agreement dated as of April 29, 1998 (the "Consulting Agreement")
by and between Grove Worldwide LLC, a Delaware limited liability company (the
"Company") and George Group, Inc., a Texas corporation (the "Consultant").

                                   WITNESSETH

         WHEREAS, the Company and the Consultant are parties to the Consulting
Agreement; and

         WHEREAS, the Company and the Consultant desire to amend the Consulting
Agreement, subject to the conditions set forth herein.

         NOW, THEREFORE, in consideration of the premises and mutual agreements
contained herein, and for other good and valuable consideration, the receipt and
sufficiency of which is hereby acknowledged, the Company and the Consultant
hereby agree as follows:

         1.       DEFINED TERMS. Unless otherwise defined herein, terms defined
                  in the Consulting Agreement shall have such meanings when used
                  herein.

         2.       TERM. The term of the Consulting Agreement is the period
                  commencing on the Effective Date and ending on December 31,
                  1999. The "Term" and the "Performance Term" as previously
                  defined are amended to reflect this new ending date.

         3.       ADVISORY SERVICES. The remaining Services to be provided by
                  the Consultant are set forth in Exhibit B, attached hereto and
                  incorporated by reference herein. The Plan as set forth in
                  Exhibit A is hereby superseded and replaced in its entirety by
                  Exhibit B.

         4.       COMPENSATION. The Monthly Fees and Expenses specified in the
                  Plan are modified in accordance with the revised staffing and
                  project focus in Exhibit B. The Company agrees to pay the
                  Consultant's actual expenses from the date of the Amendment
                  through the remainder of the Term. All other payment terms
                  (E.G., Adjustment, Consultant Bill) remain in effect and
                  unchanged.

                  The last sentence of the first paragraph of Section 4.1 is
                  deleted and replaced in its entirety with the following:

                           The actual out-of-pocket expenses of the Consultant
                           ("Actual Expenses" as reported in the Monthly Expense
                           Reconciliation Report ("Monthly

<PAGE>

                           Report") submitted to the Company) will be calculated
                           at the end of the Term of this Agreement and fifty
                           percent (50%) of the excess, if any, of (a) the total
                           "Invoiced Expenses" (as reported in the Monthly
                           Report) over (b) such Actual Expenses of the
                           Consultant to such date shall be reimbursed by
                           Consultant to the Company promptly following the
                           determination thereof.

         5.       PUBLICITY. In addition to the provisions of Section 6.3 of the
                  Consulting Agreement, neither the Consultant nor the Company
                  shall make any public statement concerning this Amendment
                  without the prior express written consent of the other party.
                  The Company and the Consultant shall agree upon the text of a
                  joint statement announcing the changed business relationship
                  under this Amendment.

         6.       SOLICITATION. Notwithstanding the provisions of Section 7.2 of
                  the Consulting Agreement, the Consultant grants permission to
                  the Company to speak to and negotiate with the employees of
                  the Consultant listed in Exhibit B for potential employment
                  with the Company.

         7.       TERMINATION. For purposes of adjustments to Class B Percentage
                  Interests of the Consultant under Section 4.5 of the LLC
                  Agreement, this Amendment shall constitute termination of the
                  Consulting Agreement.

         8.       POST-TERMINATION OBLIGATIONS. The second sentence of Section
                  8.3 (a) is deleted in its entirely and replaced by the
                  following:

                           The Actual Expenses of Consultant will be calculated
                           at the effective date of the termination of this
                           Agreement and fifty percent (50%) of the excess of
                           (a) the Invoiced Expenses funded through such date
                           (as set forth in the Plan and the Monthly Report)
                           over (b) such Actual Expenses of Consultant to such
                           date shall be reimbursed by Consultant to the Company
                           promptly following the determination thereof.

         9.       AMENDMENTS. As a written instrument duly executed by both
                  parties, this Amendment satisfies the requirements of Section
                  11 of the Consulting Agreement to effectuate the amended
                  provisions contained herein.

         10.      CONTINUING EFFECT OF CONSULTING AGREEMENT. This Amendment
                  shall not constitute a waiver, amendment, or modification of
                  any other provision of the Consulting Agreement not expressly
                  referred to herein. Except as expressly amended or modified
                  herein, the provisions of the Consulting Agreement are and
                  shall remain in full force and effect.

<PAGE>

         11.      COUNTERPARTS. This Amendment may be executed in two or more
                  counterparts, each of which shall be an original and all of
                  which together constitute one and the same instrument.

         12.      EFFECTIVENESS. This Amendment shall be effective upon receipt
                  by the Company and the Consultant of counterparts hereof, duly
                  executed and delivered by the parties.

         IN WITNESS WHEREOF, each party hereto has caused this Amendment to be
duly executed by its duly authorized representative as of the day and year first
above written.

ADDRESS:                                             GROVE WORLDWIDE LLC
1565 Buchanan Trail East
P. O. Box 21
Shady Grove, PA 17256                                By:
                                                         ----------------------
Attention:     Jeffry D. Bust                               Jeffry D. Bust

                                                     Title:   Chairman & CEO

ADDRESS:                                             GEORGE GROUP, INC.
One Galleria Tower
13355 Noel Road, Suite 1100
Dallas, Texas  75240                                          By:
                                                         ----------------------
Attention:     James Storie                          Michael George
               Les Park                              Title:  CEO

<PAGE>

                                    EXHIBIT B

                       Revised Staffing and Project Focus
<TABLE>
<CAPTION>

                    Original                      New                    Original                 New Cost
Date              Staffing Plan             Staffing Plan              Cost to Grove              to Grove
----              -------------             -------------              -------------              --------

<S>                        <C>                       <C>               <C>                      <C>
Oct. 99                    19                        19                $   297,000              $  297,000

Nov. 99                    19                        16                $   297,000              $  247,000

Dec. 99                    16                        13                $   297,000              $  217,000

                                                                                *
                                                                                *

                                                                       ----------                ---------
                                               TOTAL                   $ 3,751,000              $  761,000
                                            TOTAL GROVE SAVINGS                                 $2,990,000
</TABLE>

Note: Grove would like to speak to the following individuals about potential
employment with Grove:

<TABLE>
<CAPTION>
                -------------------------------- -----------------------------------------------
                         GGI Personnel                              Project

                -------------------------------- -----------------------------------------------
                <S>      <C>                     <C>
                1.       Pleiman, David          Manlift Product Development Team

                -------------------------------- -----------------------------------------------
                2.       Nissen, Christine       Manlift Product Development Team

                -------------------------------- -----------------------------------------------
                3.       Gordon, John            Manlift Product Program Leader

                -------------------------------- -----------------------------------------------
                4.       Sendell, Scott          Strategic Procurement Outsourcing

                -------------------------------- -----------------------------------------------
                5.       McGovern, Mark          Crane Operations

                -------------------------------- -----------------------------------------------
                6.       Blackwell, Dan          Crane Operations

                -------------------------------- -----------------------------------------------
</TABLE><PAGE>

                                                                  Exhibit 10.19

                  FIRST AMENDMENT, dated as of October 22, 1999 (this
"AMENDMENT"), to the Credit Agreement, dated as of April 29, 1998, (the "CREDIT
AGREEMENT"), among GROVE WORLDWIDE LLC, a Delaware limited liability company
(the "COMPANY"), GROVE CAPITAL, INC., a Delaware corporation and a Wholly Owned
Subsidiary of the Company ("GROVE CAPITAL"; the Company and Grove Capital,
individually, a "BORROWER" and collectively, the "BORROWERS"), the several banks
and other financial institutions or entities from time to time parties to this
Agreement (collectively, the "LENDERS"; individually, a "LENDER"), CHASE BANK OF
TEXAS, NATIONAL ASSOCIATION, as Administrative Agent (as hereinafter defined)
for the Lenders hereunder, BANKBOSTON, N.A., as syndication agent (in such
capacity, the "SYNDICATION AGENT") for the Lenders hereunder, and DONALDSON,
LUFKIN & JENRETTE SECURITIES CORPORATION, as documentation agent (in such
capacity, the "DOCUMENTATION AGENT") for the Lenders hereunder.

                              W I T N E S S E T H:

                  WHEREAS, pursuant to the Credit Agreement, the Lenders have
agreed to make, and have made, certain loans and other extensions of credit to
the Borrowers; and

                  WHEREAS, the Borrowers have requested, and, upon this
Amendment becoming effective, the Required Lenders have agreed, that certain
provisions of the Credit Agreement be amended in the manner provided for in this
Amendment.

                  NOW, THEREFORE, the parties hereto hereby agree as follows:

                  1. DEFINED TERMS. Terms defined in the Credit Agreement and
used herein shall have the meanings given to them in the Credit Agreement.

                  2. AMENDMENTS TO SECTION 1.1 OF THE CREDIT AGREEMENT. (a)
Section 1.1 of the Credit Agreement is hereby amended by deleting the definition
of "CONSOLIDATED EBITDA" and substituting in lieu thereof the following
definition:

                     "CONSOLIDATED EBITDA": for any period, Consolidated Net
Income for such period PLUS, without duplication and to the extent reflected as
a charge in the statement of such Consolidated Net Income for such period, the
sum of (a) income tax expense and distributions to the direct and indirect
members of Holdings in lieu of taxes, (b) Consolidated Interest Expense,
non-cash interest expense not included in Consolidated Interest Expense,
amortization or writeoff of debt discount and debt issuance costs and
commissions, discounts and other fees and charges associated with Indebtedness
(including the Loans), (c) depreciation and amortization expense and other
non-cash charges, (d) amortization of intangibles (including goodwill) and
organization costs, (e) the aggregate amount of up-front or one-time fees or
expenses payable in respect of Interest Rate Protection Agreements during such
period (to the

<PAGE>
                                                                               2

extent deducted in determining Consolidated Net Income for such period), (f) for
the periods of four consecutive fiscal quarters of the Company ended September
30, 1999, December 31, 1999, March 31, 2000, June 30, 2000 and September 30,
2000, the direct and indirect costs of implementing new management information
systems (including, without limitation, productivity losses and overtime and
systems support expenses) as reasonably estimated by the Company and reported to
the Administrative Agent, not to exceed the amount set forth below:

<TABLE>
<CAPTION>

                             Four Quarters
                                 Ended                            Amount
                             --------------                       ------
                           <S>                                <C>
                           September 30, 1999                 $17,700,000
                           December 31, 1999                   15,500,000
                           March 31, 2000                      13,000,000
                           June 30, 2000                        9,300,000
                           September 30, 2000                   6,000,000
</TABLE>

PLUS (g) for the periods of four consecutive fiscal quarters of the Company
ended September 30, 1999, December 31, 1999, March 31, 2000, June 30, 2000 and
September 30, 2000, severance charges (which severance charges shall not exceed,
for the four consecutive fiscal quarters ended September 30, 1999 only,
$600,000), PLUS (h) the amount of unrealized foreign exchange losses (net of any
gains) (or MINUS the amount of unrealized foreign exchange gains (net of any
losses)) MINUS, to the extent included in the statement of such Consolidated Net
Income for such period, other non-cash income.

                  (b) Section 1.1 of the Credit Agreement is hereby amended by
deleting the definition of "PERMITTED ACQUISITION" and substituting in lieu
thereof the following definition:

                      "PERMITTED ACQUISITION":  any acquisition of a Person,
division or line of business in the same or related line of business by the
Company or any of its Subsidiaries for a purchase price (including any
Indebtedness assumed and continuing outstanding), together with the aggregate
purchase price paid in connection with other such acquisitions since the Closing
Date, of up to an amount of $50,000,000; PROVIDED that (i) the Company receives
approval from Required Lenders to any such acquisitions completed prior to the
date which is 12 months after the Amendment Effective Date; (ii) at any time of
such acquisition, based upon the assumption that such acquisition and any
additional Indebtedness incurred to finance such acquisition had been
consummated and incurred at the beginning of the most recently completed four
fiscal quarter period, and taking into account the earnings (or loss) of the
acquired Person, division or business line during such period and, anticipated
cost savings resulting from such acquisition, the Company shall, based upon PRO
FORMA financial statements reviewed (including as to the anticipated cost
savings) by the Company's independent public accountants, be in PRO FORMA
compliance with the provisions of Section 7.1 and have a PRO FORMA Consolidated
Fixed Charge Coverage Ratio of 1.10 to 1.0 and (iii) no Default or Event of
Default shall have occurred and be continuing.

<PAGE>
                                                                               3

                  3. AMENDMENT TO SECTION 4.16 OF THE CREDIT AGREEMENT. Section
4.16 of the Credit Agreement is hereby amended and restated in its entirety as
follows:

                     The proceeds of the Term Loans shall be used to finance a
portion of the Acquisition and to pay related fees and expenses. The proceeds of
the Revolving Credit Loans and/or the Swing Line Loans shall be used (a) to
finance a portion of the Acquisition and to pay related fees and expenses, (b)
to finance Permitted Acquisitions and (c) for general corporate purposes of the
Borrowers and their Subsidiaries; PROVIDED that no more than $60,000,000 of such
proceeds shall be used for purposes referred to in clause (c) until the delivery
of the first set of consolidated financial statements on or after December 31,
1999 showing that for the four fiscal quarters ending with the last fiscal
quarter covered by such consolidated financial statements, a Consolidated Fixed
Charge Coverage Ratio (but using as the definition of "CONSOLIDATED EBITDA" for
purposes of determining such Consolidated Fixed Charge Coverage Ratio the
definition thereof as in effect prior to the First Amendment dated as of October
22, 1999 to this Agreement) of 1.30 to 1.0.

                  4. AMENDMENT TO SECTION 7.1(B) OF THE CREDIT AGREEMENT.
Section 7.1(b) of the Credit Agreement is hereby amended by deleting the table
and substituting in lieu thereof the following table:

<TABLE>
<CAPTION>

                                                                      Consolidated Fixed
                    Period                                            Charge Coverage Ratio
                    ------                                            ---------------------
                  <S>                                                       <C>
                  Closing Date to 6/30/1999                                 1.05 to 1.0
                  9/30/1999 to 3/31/2000                                    1.00 to 1.0
                  6/30/2000 to 12/31/2001                                   1.10 to 1.0
                  3/31/2002 to 12/31/2002                                   1.15 to 1.0
                  3/31/2003 to 12/31/2003                                   1.25 to 1.0
                  3/31/2004 to 12/31/2004                                   1.50 to 1.0
                  3/31/2005 to 12/31/2005                                   1.75 to 1.0
                  thereafter                                                2.00 to 1.0
</TABLE>

                  5. AMENDMENT TO ANNEX A OF THE CREDIT AGREEMENT. Annex A of
the Credit Agreement is hereby amended by deleting the Pricing Grid therein and
substituting in lieu thereof the Pricing Grid attached hereto as Annex A.

                  6. CONDITIONS TO EFFECTIVENESS. This Amendment shall become
effective on the date (the "AMENDMENT EFFECTIVE DATE") first set forth above
upon the Administrative Agent having received counterparts of this Amendment
duly executed and delivered by the Borrowers and the Required Lenders together
with a Consent to this Amendment duly executed and delivered by the Loan
Parties.

<PAGE>
                                                                               4

                  7. REPRESENTATION AND WARRANTIES. To induce the Agents and the
Lenders parties hereto to enter into this Amendment, each Borrower hereby
represents and warrants to the Agents and all of the Lenders as of the Amendment
Effective Date that: the unaudited consolidated balance sheet of the Company and
its consolidated Subsidiaries as at June 30, 1999 and the related unaudited
consolidated statements of income and of cash flows for the nine-month period
ended on such date, certified by a Responsible Officer, copies of which have
heretofore been furnished to each Lender, are complete and correct and present
fairly the consolidated financial condition of the Company and its consolidated
Subsidiaries as at such date, and the consolidated results of their operations
and their consolidated cash flows for the nine-month period then ended (subject
to normal year-end audit adjustments).

                  8. AFFIRMATION. The Borrowers and Lenders agree that the
amendments herein to the definition of Consolidated EBITDA and Section 7.1(b) of
the Credit Agreement, shall be effective for purposes of calculating the
Consolidated Fixed Charge Coverage Ratio pursuant to and complying with Section
7.1(b) of the Credit Agreement for the period ending October 2, 1999.

                  9. GENERAL. (a) PAYMENT OF EXPENSES. The Borrowers jointly and
severally agree to pay or reimburse the Administrative Agent for all of its
out-of-pocket costs and reasonable expenses incurred in connection with this
Amendment, any other documents prepared in connection herewith and the
transactions contemplated hereby, including, without limitation, the reasonable
fees and disbursements of counsel to the Administrative Agent.

                  (b) NO OTHER AMENDMENTS; CONFIRMATION. Except as expressly
amended, modified and supplemented hereby, the provisions of the Credit
Agreement and the Notes are and shall remain in full force and effect.

                  (c) GOVERNING LAW. THIS AMENDMENT AND THE RIGHTS AND
OBLIGATIONS OF THE PARTIES UNDER THIS AMENDMENT SHALL BE GOVERNED BY, AND
CONSTRUED AND INTERPRETED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

                  (d) COUNTERPARTS. This Amendment may be executed by one or
more of the parties to this Amendment on any number of separate counterparts,
and all of said counterparts taken together shall be deemed to constitute one
and the same instrument. A set of the copies of this Amendment signed by all the
parties shall be lodged with each Borrower and the Administrative Agent.

                  (e) SUCCESSORS. The execution and delivery of this Amendment
by any Lender

<PAGE>
                                                                               5

 shall be binding upon each of its successors and assigns (including
Transferees of its commitments and Loans in whole or in part prior to
effectiveness hereof) and binding in respect of all of its Revolving Credit
Commitment and Loans.

<PAGE>
                                                                               6

                 [THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.]

<PAGE>
                                                                               7

                  IN WITNESS WHEREOF, the parties hereto have caused this
Amendment to be duly executed and delivered by their respective proper and duly
authorized officers as of the day and year first above written.

                                GROVE WORLDWIDE LLC

                                By:________________________
                                Name:
                                Title:

                                GROVE CAPITAL, INC.

                                By:________________________
                                Name:
                                Title:

                                CHASEBANK OF TEXAS, NATIONAL
                                  ASSOCIATION, as Administrative Agent,
                                  Swing Line Lender, Issuing Lender and a
                                  Lender

                                By:________________________
                                Name:
                                Title:

                                BANKBOSTON, N.A., as Syndication Agent
                                 and as a Lender

                                By:________________________
                                Name:
                                Title:

<PAGE>
                                                                               8

                                DONALDSON, LUFKIN & JENRETTE
                                  SECURITIES CORPORATION, as
                                  Documentation Agent and as a Lender

                                By:________________________
                                Name:
                                Title:

                                ARCHIMEDES FUNDING, L.L.C.

                                By:________________________
                                Name:
                                Title:

                                BALANCED HIGH-YIELD FUND I LTD.

                                By:________________________
                                Name:
                                Title:

                                THE BANK OF NEW YORK

                                By:________________________
                                Name:
                                Title:

                                BHF (USA) CAPITAL CORPORATION

                                By:________________________
                                Name:
                                Title:

<PAGE>
                                                                               9

                                BHF-BANK AKTIENGESELLSCHAFT

                                By:________________________
                                Name:
                                Title:

                                CERES FINANCE, LTD.

                                By:________________________
                                Name:
                                Title:

                                COMERICA BANK

                                By:________________________
                                Name:
                                Title:

                                CONTINENTAL ASSURANCE COMPANY

                                By:________________________
                                Name:
                                Title:

                                CREDIT LYONNAIS NEW YORK BRANCH

                                By:________________________
                                Name:
                                Title:

<PAGE>
                                                                              10

                                CYPRESSTREE INVESTMENT FUND, LLC
                                BY:  CYPRESSTREE INVESTMENT
                                MANAGEMENT COMPANY, INC., its Managing
                                Member

                                By:________________________
                                Name:
                                Title:

                                CYPRESSTREE INVESTMENT PARTNERS II,
                                LTD.,
                                BY:  CYPRESSTREE INVESTMENT
                                MANAGEMENT COMPANY, INC., as Portfolio
                                Manager

                                By:________________________
                                Name:
                                Title:

                                ELC (CAYMAN) LTD.

                                By:________________________
                                Name:
                                Title:

                                FLEET NATIONAL BANK

                                By:________________________
                                Name:
                                Title:

<PAGE>
                                                                              11

                                FLEET BUSINESS CREDIT CORPORATION

                                By:________________________
                                Name:
                                Title:

                                FREMONT INVESTMENT AND LOAN

                                By:________________________
                                Name:
                                Title:

                                GENERAL ELECTRIC CAPITAL CORP

                                By:________________________
                                Name:
                                Title:

                                KZH CRESCENT 2 LLC

                                By:________________________
                                Name:
                                Title:

                                KZH CRESCENT 3 LLC

                                By:________________________
                                Name:
                                Title:

                                KZH CRESCENT LLC

<PAGE>
                                                                              12

                                By:________________________
                                Name:
                                Title:

                                KZH III LLC

                                By:________________________
                                Name:
                                Title:

                                KZH RIVERSIDE LLC

                                By:________________________
                                Name:
                                Title:

                                KZH CYPRESS TREE-1 LLC

                                By:________________________
                                Name:
                                Title:

                                MASSACHUSETTS MUTUAL LIFE
                                INSURANCE

                                By:________________________
                                Name:
                                Title:

                                OAK HILL SECURITIES FUND, L.P.

<PAGE>
                                                                              13

                                By:________________________
                                Name:
                                Title:

                                OASIS COLLATERALIZED HIGH INCOME
                                PORTFOLIO

                                By:________________________
                                Name:
                                Title:

                                BANQUE PARIBAS

                                By:________________________
                                Name:
                                Title:

                                SEQUILS I, LTD.

                                By:________________________
                                Name:
                                Title:

                                SOCIETE GENERALE

                                By:________________________
                                Name:
                                Title:

<PAGE>
                                                                              14

                                SOMERS CDO, LIMITED

                                By:________________________
                                Name:
                                Title:

                                U.S. BANK NATIONAL ASSOCIATION

                                By:________________________
                                Name:
                                Title:

                                WELLS FARGO BANK, N.A.

                                By:________________________
                                Name:
                                Title:

<PAGE>
                                                                              15

                  Each of the undersigned hereby consents to the foregoing
Amendment and hereby confirms, reaffirms and restates that its obligations under
or in respect of the Credit Agreement and the documents related thereto to which
it is party are and shall remain in full force and effect after giving effect to
the foregoing Amendment and agrees and confirms, in the case of National Crane
Corporation, that it is a party to the Guarantee and Collateral Agreement as a
Grantor thereunder:

                                GROVE HOLDINGS LLC

                                By:      ________________________
                                Title:

                                GROVE WORLDWIDE LLC

                                By:      ________________________
                                Title:

                                GROVE CAPITAL, INC.

                                By:      ________________________
                                Title:

                                GROVE U.S. LLC

                                By:      ________________________
                                Title:

                                CRANE ACQUISITION CORPORATION

                                By:      ________________________
                                Title:

<PAGE>
                                                                              16

                                CRANE HOLDING INC.

                                By:       _______________________
                                Title:

                                GROVE FINANCE LLC

                                By:      ________________________
                                Title:

                                NATIONAL CRANE CORPORATION

                                By:      ________________________
                                Title:

<PAGE>
                                                                              17

<TABLE>
<CAPTION>

                                                                                                               ANNEX A

                                                                 PRICING GRID

                                              Revolving        Revolving
                                                Credit           Credit         Term Loan        Term Loan
                             Fixed            Applicable       Applicable      Applicable       Applicable
                             Charge           Margin for       Margin for      Margin for       Margin for
                            Coverage         Eurocurrency      Base Rate      Eurocurrency      Base Rate      Commitment
                             Ratio              Loans            Loans           Loans            Loans         Fee Rate

<S>                        <C>                <C>             <C>             <C>             <C>              <C>
Greater than or equal to   2.5 to 1.0         2.500%          1.500%          3.000%          2.000%           .500%
Greater than or equal to   2.0 to 1.0         2.750%          1.750%          3.250%          2.250%           .500%
Less than                  2.0 to 1.0         3.000%          2.000%          3.500%          2.500%           .500%
                        ================  ==============  ==============  ===============  ==============  ============

</TABLE>

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