The ratings of 4 Machinery stocks are down this week, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Slipping from a C to a D rating, Greenbrier Companies, Inc. (GBX) takes a hit this week. Greenbrier Companies, Inc. supplies transportation equipment and services to the railroad and related industries. For more information, get Portfolio Grader’s complete analysis of GBX stock.

This week, Gorman-Rupp Company’s (GRC) rating worsens to a D from the company’s C rating a week ago. Gorman-Rupp Company designs, manufactures, and sells pumps and related fluid control equipment. The company also gets F’s in earnings surprise. For more information, get Portfolio Grader’s complete analysis of GRC stock.

Graham Corporation (GHM) slips from a D to a F this week. Graham Corporation designs and builds vacuum and heat transfer equipment for process industries around the world. The company also gets F’s in sales growth and earnings momentum. For more information, get Portfolio Grader’s complete analysis of GHM stock.

Mueller Water Products, Inc. Class A’s (MWA) rating weakens this week, dropping to a D versus last week’s C. Mueller Water Products, Inc. Class A manufactures a broad range of water infrastructure and flow control products for use in water distribution networks, water and wastewater treatment facilities, gas distribution systems and fire protection piping systems. For more information, get Portfolio Grader’s complete analysis of MWA stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.