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’s (HY) rating falls this week to an F (“strong sell”), down from last week’s 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.

This week, Trinity Industries, Inc. (TRN) falls to a D (“sell”), worse than last week’s grade of C (“hold”). 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 rates an F in Earnings Momentum. As of June 26, 2015, 12.5% 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, falling 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. Shares of the stock have been exchanging at an usually rapid pace, twice the rate of the week prior. 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 June 26, 2015, 12.1% 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) gets weaker ratings this week as last week’s C drops to a D. 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’s trailing PE Ratio is 39.90. For more information, get Portfolio Grader’s complete analysis of WTS stock.

This is a rough week for Kaydon Corporation (KDN). The company’s rating falls to F from the previous week’s D. Kaydon designs, manufactures, and sells custom-engineered products for a variety of industries, including aerospace, defense, and industrial. The stock gets F’s in Earnings Growth, Earnings Momentum, Cash Flow and Margin Growth. The stock currently 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.

Sun Hydraulics Corporation (SNHY) earns a D this week, moving down from last week’s grade of 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.

Slipping from a C to a D rating, Dover Corporation (DOV) takes a hit this week. 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.’s (CIR) rating weakens this week, dropping to an F versus last week’s D. 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.