This week, the overall grades of three Machinery stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Caterpillar’s (NYSE:CAT) rating falls this week to an F (“strong sell”), down from last week’s D (“sell”). Caterpillar provides construction and mining equipment, diesel and natural gas engines, and industrial gas turbines. In Portfolio Grader’s specific subcategory of Earnings Surprise, CAT also gets an F. To get an in-depth look at CAT, get Portfolio Grader’s complete analysis of CAT stock.

This week, CNH Industrial NV (NYSE:CNHI) falls to a D (“sell”), worse than last week’s grade of C (“hold”). CNH Industrial designs, produces, and sells agricultural and construction equipment, trucks and commercial vehicles, and engines and transmissions for industrial and marine applications worldwide. The stock price has dropped 12.2% over the past month, worse than the 1.7% decrease the S&P 500 has seen over the same period of time. The stock has a trailing PE Ratio of 54.90. For more information, get Portfolio Grader’s complete analysis of CNHI stock.

Kaydon Corporation (NYSE:KDN) is having a tough week. The company’s rating falls from a D to an F. 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 currently has a trailing PE Ratio of 37.20. For a full analysis of KDN stock, visit Portfolio Grader.

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.