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. To get an in-depth look at HY, 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 Sept. 4, 2015, 11.4% of outstanding Trinity Industries, Inc. shares were held short. For more information, get Portfolio Grader’s complete analysis of TRN stock.

The rating of American Railcar Industries, Inc. (ARII) slips 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. To get an in-depth look at ARII, get Portfolio Grader’s complete analysis of ARII stock.

Manitowoc Company, Inc. (MTW) experiences a ratings drop this week, going from last week’s D to an F. 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 Sept. 4, 2015, 15.6% of outstanding Manitowoc Company, Inc. shares were held short. For more information, get Portfolio Grader’s complete analysis of MTW stock.

This week, Watts Water Technologies, Inc. Class A (WTS) drops from a C to a D rating. 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 41.00. To get an in-depth look at WTS, get Portfolio Grader’s complete analysis of WTS stock.

Kaydon Corporation’s (KDN) rating weakens this week, dropping to an F versus last week’s D. 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. For more information, get Portfolio Grader’s complete analysis of KDN stock.

The rating of Sun Hydraulics Corporation (SNHY) declines this week from a C to a D. 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. To get an in-depth look at SNHY, get Portfolio Grader’s complete analysis of SNHY stock.

This week, Dover Corporation’s (DOV) rating worsens to a D from the company’s C rating a week ago. 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. For more information, get Portfolio Grader’s complete analysis of DOV stock.

The rating of CIRCOR International, Inc. (CIR) declines this week from a D 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. To get an in-depth look at CIR, 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.