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

Hyster-Yale Materials Handling, Inc. Class A (HY) earns an F (“strong sell”) this week, moving down from last week’s grade of D (“sell”). In Portfolio Grader’s specific subcategories of Earnings Revisions and Earnings Surprise, HY also gets F’s. Shares of the stock have been changing hands at an unusually rapid pace, twice the rate of the week prior. For more information, get Portfolio Grader’s complete analysis of HY stock.

Trinity Industries, Inc.’s (TRN) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. Trinity Industries is engaged in the manufacture and sale of railcars and railcar parts, inland barges, structural wind towers, concrete and aggregates, asphalt, highway products and structural steel components. The stock also gets an F in Earnings Momentum. As of June 12, 2015, 12.9% of outstanding Trinity Industries, Inc. shares were held short. To get an in-depth look at TRN, get Portfolio Grader’s complete analysis of TRN stock.

American Railcar Industries, Inc. (ARII) is having a tough week. The company’s rating falls from a C to a D. American Railcar Industries designs, manufactures, and sells hopper and tank railcars in North America. The stock gets F’s in Cash Flow and Sales Growth. For more information, get Portfolio Grader’s complete analysis of ARII stock.

Manitowoc Company, Inc. (MTW) earns an F this week, moving down from last week’s grade of D. Manitowoc is a diversified industrial manufacturer of cranes and related products and food service equipment. The stock gets F’s in Earnings Revisions and Earnings Surprise. As of June 12, 2015, 10.9% of outstanding Manitowoc Company, Inc. shares were held short. To get an in-depth look at MTW, get Portfolio Grader’s complete analysis of MTW stock.

Watts Water Technologies, Inc. Class A (WTS) earns a D this week, falling from last week’s grade of C. Watts Water Technologies designs, manufactures and sells a line of water safety and flow control products for the water quality, water conservation, water safety and water flow control markets. The stock gets F’s in Earnings Revisions and Earnings Surprise. The stock currently has a trailing PE Ratio of 39.30. For more information, get Portfolio Grader’s complete analysis of WTS stock.

Slipping from a D to an F rating, Kaydon Corporation (KDN) takes a hit this week. Kaydon designs, manufactures, and sells custom-engineered products for a variety of industries, including aerospace, defense, and industrial. The stock receives F’s in Earnings Growth, Earnings Momentum, Cash Flow and Margin Growth. The stock has a trailing PE Ratio of 37.20. To get an in-depth look at KDN, get Portfolio Grader’s complete analysis of KDN stock.

This week, Sun Hydraulics Corporation’s (SNHY) rating worsens to a D from the company’s C rating a week ago. Sun Hydraulics designs and manufactures high-performance screw-in hydraulic cartridge valves and manifolds, which control force, speed and motion as integral components in fluid power systems. For more information, get Portfolio Grader’s complete analysis of SNHY stock.

Dover Corporation (DOV) experiences a ratings drop this week, going from last week’s C to a D. Dover owns and operates a global portfolio of manufacturing companies that provide components and equipment, specialty systems and support services in the industrial products, engineered systems, fluid management and electronic technologies markets. To get an in-depth look at DOV, get Portfolio Grader’s complete analysis of DOV stock.

CIRCOR International, Inc. (CIR) gets weaker ratings this week as last week’s D drops to an F. CIRCOR designs, manufactures, and markets highly-engineered products, such as valves, that control the flow of fluids safely and efficiently in the energy, aerospace, and industrial markets. The stock gets F’s in Earnings Revisions and Sales Growth. For more information, get Portfolio Grader’s complete analysis of CIR 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.