SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 11-K

ANNUAL REPORT

OR

THE GORMAN-RUPP COMPANY 401(k) PLAN

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The Exhibit Index is located at Page 14.

REQUIRED INFORMATION

Audited plan financial statements and schedules prepared in accordance with the financial reporting requirements of the Employee Retirement Income Security Act of 1974, as amended, are filed herewith in lieu of the requirements of audited statements of financial condition and audited statements of income and changes in plan equity.

Financial Statements and Exhibits

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The Gorman-Rupp Company 401(k) Plan

Audited Financial Statements
and Supplemental Schedules

December 31, 2004 and 2003, and
Year Ended December 31, 2004

Contents

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Report of Independent Registered Public Accounting Firm

The Plan Administrators

We have audited the accompanying statements of net assets available for benefits of The Gorman-Rupp Company 401(k) Plan as of December 31, 2004 and 2003, and the related statement of changes in net assets available for benefits for the year ended December 31, 2004. These financial statements are the responsibility of the Plan’s management. Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. We were not engaged to perform an audit of the Plan’s internal control over financial reporting. Our audit included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Plan’s internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in all material respects, the net assets available for benefits of the Plan at December 31, 2004 and 2003, and the changes in its net assets available for benefits for the year ended December 31, 2004, in conformity with U.S. generally accepted accounting principles.

Our audits were performed for the purpose of forming an opinion on the financial statements taken as a whole. The accompanying supplemental schedules of assets (held at end of year) as of December 31, 2004, and reportable transactions for the year then ended, are presented for purposes of additional analysis and are not a required part of the financial statements but are supplementary information required by the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974. These supplemental schedules are the responsibility of the Plan’s management. The supplemental schedules have been subjected to the auditing procedures applied in our audits of the financial statements and, in our opinion, are fairly stated in all material respects in relation to the financial statements taken as a whole.

May 20, 2005

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The Gorman-Rupp Company 401(k) Plan

Statements of Net Assets Available for Benefits

See accompanying notes to financial statements.

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The Gorman-Rupp Company 401(k) Plan

Statement of Changes in Net Assets Available for Benefits

Year Ended December 31, 2004

See accompanying notes to financial statements.

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The Gorman-Rupp Company 401(k) Plan

Notes to Financial Statements

December 31, 2004 and 2003 and

1. Description of the Plan

The following description of The Gorman — Rupp Company 401(k) Plan (Plan) provides only general information. Participants should refer to the Summary Plan Description for a more complete description of the Plan’s provisions.

General

The Plan is a defined contribution plan covering substantially all employees of the Corporate, Mansfield and Industries Divisions of The Gorman — Rupp Company (Company and Plan Administrator) and Patterson Pump Company, a subsidiary of the Company. The Plan is subject to the provisions of the Employee Retirement Income Security Act of 1974 (ERISA).

Contributions

Each year, participants may contribute up to 15% of pretax annual compensation, as defined in the Plan. Participants may also contribute amounts representing distributions from other qualified defined benefit or defined contribution plans. Effective August 1, 2000, the Company contributes 40% of the first 4% of compensation that a participant contributes to the Plan.

Upon enrollment, a participant may direct employee contributions in whole increments to any of the investment fund options offered by the Plan. Effective August 1, 2000, employer contributions are restricted to the Gorman-Rupp Company Common Stock Fund. Participants may change their investment options daily.

Participant Accounts

Each participant’s account is credited with the participant’s contributions and allocations of (a) the Company’s contributions and (b) Plan earnings. Allocations are based on participant earnings or account balances, as defined. The benefit to which a participant is entitled is the benefit that can be provided from the participant’s account.

Vesting

Participants are immediately vested in their contributions plus actual earnings thereon. Participants are also fully vested in the Company contribution portion of their accounts plus actual earnings thereon.

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The Gorman-Rupp Company 401(k) Plan

Notes to Financial Statements (continued)

1. Description of the Plan (Continued)

Participant Loans

Participants may borrow from their fund accounts a minimum of $1,000 up to a maximum equal to the lesser of $50,000 or 50% of their vested account balance. Loan terms range from 1-5 years or up to 20 years for the purchase of a primary residence. The loans are secured by the balance in the participant’s account and bear interest at the prime rate, as quoted in the Wall Street Journal. Principal and interest is paid ratably through payroll deductions.

Payment of Benefits

Upon retirement, death, or termination of employment, a participant will receive a lump-sum amount equal to the vested value of his or her account.

Plan Termination

Although it has not expressed any intent to do so, the Company has the right under the Plan to discontinue its contributions at any time and to terminate the Plan subject to the provisions of ERISA.

2. Summary of Significant Accounting Policies

Basis of Accounting

The financial statements have been prepared on the accrual basis of accounting.

Investment Valuation and Income Recognition

The Plan’s investments are stated at fair value. The shares of registered investment companies are valued at quoted market prices which represent the net asset values of shares held by the Plan at year-end. The Company stock is valued at its quoted market price as of the last business day of the Plan’s year. The participant loans are valued at their outstanding balances, which approximate fair value.

Purchases and sales of securities are recorded on a trade-date basis. Interest income is recorded on the accrual basis. Dividends are recorded on the ex-dividend date.

Use of Estimates

The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.

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The Gorman-Rupp Company 401(k) Plan

Notes to Financial Statements (continued)

3. Investments

During 2004, the Plan’s investments (including investments purchased, sold, as well as held during the year) appreciated in fair value as determined by quoted market prices as follows:

Investments that represent 5% or more of the Plan’s net assets are as follows:

4. Nonparticipant-Directed Investments

The Gorman-Rupp Company Common Stock Fund contains participant account balances that are both participant-directed and nonparticipant-directed. Because the fund contains balances that are nonparticipant-directed, the entire fund is considered nonparticipant-directed for disclosure purposes.

Information about the net assets and the significant components of changes in net assets related to nonparticipant-directed investments is as follows:

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The Gorman-Rupp Company 401(k) Plan

Notes to Financial Statements (continued)

4. Nonparticipant-Directed Investments (continued)

5. Administrative Costs

Fees for legal, accounting, asset management, and other services rendered to the Plan are paid by the Company.

6. Risks and Uncertainties

The Plan invests in various investment securities. Investment securities are exposed to various risks such as interest rate, market and credit risks. Due to the level of risk associated with certain investment securities, it is at least reasonably possible that changes in the values of the investment securities will occur in the near term and that such changes could materially affect participants’ account balances and the amounts reported in the statements of net assets available for benefits.

7. Income Tax Status

The Plan has received a determination letter from the Internal Revenue Service (IRS) dated May 14, 2004, stating that the Plan is qualified under section 401(a) of the Internal Revenue Code (Code) and, therefore, the related trust is exempt from taxation. Subsequent to this determination by the IRS, the Plan was amended. Once qualified, the Plan is required to operate in conformity with the Code to maintain its qualification. The Plan Administrator believes the Plan is being operated in compliance with the applicable requirements of the Code and, therefore, believes that the Plan, as amended, is qualified and the related trust is tax exempt.

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The Gorman-Rupp Company 401(k) Plan

EIN #34-0253990    Plan #005

Schedule H, Line 4i — Schedule of Assets

December 31, 2004

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The Gorman-Rupp Company 401(k) Plan

EIN #34-0253990    Plan #005

Schedule H, Line 4j — Schedule of Reportable Transactions

Year Ended December 31, 2004

There were no category (i), (ii), or (iv) reportable transactions during the year ended December 31, 2004.

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SIGNATURES

The Plan. Pursuant to the requirements of the Securities Exchange Act of 1934, the trustees (or other persons who administer the employee benefit plan) have duly caused this annual report to be signed on its behalf by the undersigned hereunto duly authorized.

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EXHIBIT INDEX

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