Exhibit 5.1

                           F O L E Y  &  L A R D N E R

                          A T T O R N E Y S  A T  L A W

   CHICAGO                       FIRSTAR CENTER                     SAN DIEGO
   JACKSONVILLE             777 EAST WISCONSIN AVENUE           SAN FRANCISCO
   LOS ANGELES           MILWAUKEE, WISCONSIN 53202-5367          TALLAHASSEE
   MADISON                  TELEPHONE (414) 271-2400                    TAMPA
   ORLANDO                  FACSIMILE (414) 297-4900         WASHINGTON, D.C.
   SACRAMENTO                                                 WEST PALM BEACH
                              WRITER'S DIRECT LINE

                                 (414) 297-5678

                                February 27, 1998



   HK Systems, Inc.
   2855 South James Drive
   New Berlin, Wisconsin 53151

   Gentlemen:

             We have acted as special counsel for HK Systems, Inc., a
   Wisconsin corporation (the "Company"), with respect to the preparation of
   the Company's Registration Statement on Form S-1 (the "Registration
   Statement"), including the prospectus constituting a part thereof (the
   "Prospectus"), to be filed by the Company with the Securities and Exchange
   Commission under the Securities Act of 1933, as amended (the "Securities
   Act"), in connection with the proposed sale by the Company and certain
   shareholders of the Company (the "Selling Shareholders") of such number of
   shares (the "Shares") of the Company's Common Stock, $.01 par value (the
   "Common Stock"), having a value upon filing of the Registration Statement
   of up to $115,000,000 in the manner set forth in the Registration
   Statement and Prospectus.  

             In connection with our representation, we have examined (i) the
   Registration Statement, including the Prospectus; (ii) the Company's
   Amended and Restated Articles of Incorporation and the Company's By-laws,
   as proposed to be amended upon the consummation of the offering and sale
   of the Shares; (iii) the resolutions of the Board of Directors of the
   Company relating to the offering and sale of the Shares; and (iv) such
   other proceedings, documents and records we deemed necessary to enable us
   to render this opinion.

             Based upon the foregoing, and having regard for such legal
   considerations as we deem relevant, we are of the opinion that:

             1.   The Company is a corporation validly existing under the
   laws of the State of Wisconsin.

             2.   The Shares that are to be offered and sold by the Company,
   when the price thereof has been determined by action of the Company's
   Board of Directors and when issued and paid for in the manner contemplated
   in the Registration Statement and Prospectus, will be validly issued,
   fully paid and nonassessable and no personal liability will attached to
   the ownership thereof, except for debts owing to employees of the Company
   for services performed, but not exceeding six months' service in any one
   case, as provided in Section 180.0622(2)(b) of the Wisconsin Business
   Corporation Law as interpreted in Local 257 of Hotel and Restaurant
   Employees and Bartenders International Union v. Wilson Street East Dinner
   Playhouse, Inc., Case No. 82-CV-0023, Cir. Ct. Branch 1, Dane County,
   Wisconsin, aff'd, 375 N.W. 2d 664 (Wis. 1979).

             3.   The Shares that are to be offered and sold by the Selling
   Shareholders when issued pursuant to the Conversion (as defined in the
   Registration Statement) will be, and when sold in the manner contemplated
   in the Registration Statement and Prospectus will continue to be, validly
   issued, fully paid and nonassessable except with respect to wage claims of
   employees of the Company for services performed, as described above and as
   provided in Section 180.0622(2)(b) of the Wisconsin Business Corporation
   Law.

             We consent to the use of this opinion as an exhibit to the
   Registration Statement and to the references to our firm therein.  In
   giving our consent, we do not admit that we are "experts" within the
   meaning of Section 11 of the Securities Act or within the category of
   persons whose consent is required by Section 7 of the Securities Act.

                                      Very truly yours,

                                      /s/ FOLEY & LARDNER

                                      FOLEY & LARDNER