This week, the overall grades of nine machinery stocks are lower, 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’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. 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 rates an F in Earnings Momentum. As of April 17, 2015, 13.4% of outstanding Trinity Industries, Inc. shares were held short. For more information, get Portfolio Grader’s complete analysis of TRN stock.

This week, American Railcar Industries, Inc. (ARII) drops from a C to a D rating. 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. To get an in-depth look at ARII, get Portfolio Grader’s complete analysis of ARII stock.

This is a rough week for Manitowoc Company, Inc. (MTW). The company’s rating falls to F from the previous week’s 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 April 17, 2015, 12.3% of outstanding Manitowoc Company, Inc. shares were held short. For more information, get Portfolio Grader’s complete analysis of MTW stock.

The rating of Watts Water Technologies, Inc. Class A (WTS) declines this week from a C 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 currently has a trailing PE Ratio of 39.40. To get an in-depth look at WTS, get Portfolio Grader’s complete analysis of WTS stock.

Kaydon Corporation (KDN) earns an F this week, moving down from last week’s grade of D. 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. For more information, get Portfolio Grader’s complete analysis of KDN stock.

Sun Hydraulics Corporation (SNHY) is having a tough week. The company’s rating falls 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.

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. For more information, get Portfolio Grader’s complete analysis of DOV stock.

This week, CIRCOR International, Inc.’s (CIR) rating worsens to an F from the company’s D rating a week ago. 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. Shares of the stock have been trading at an exceptionally rapid pace, up threefold from the week prior. 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.