This week, the ratings of nine machinery stocks on Portfolio Grader are down. 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. 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 July 24, 2015, 11.7% 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) earns a D this week, moving down from last week’s grade of C. 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.

This week, Manitowoc Company, Inc. (MTW) drops from a D to an F rating. 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 July 24, 2015, 13.2% of outstanding Manitowoc Company, Inc. shares were held short. Shares of the stock have been exchanging at an usually rapid pace, twice the rate of the week prior. To get an in-depth look at MTW, get Portfolio Grader’s complete analysis of MTW stock.

Watts Water Technologies, Inc. Class A’s (WTS) rating weakens this week, dropping to a D versus last week’s 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. Shares of the stock are changing hands at twice the rate they were a week ago. The stock has a trailing PE Ratio of 37.10. For more information, get Portfolio Grader’s complete analysis of WTS stock.

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

This is a rough week for Sun Hydraulics Corporation (SNHY). The company’s rating falls to D from the previous week’s C. 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) earns a D this week, falling from last week’s grade of C. 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) experiences a ratings drop this week, going from last week’s 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. 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.