May 05, 2005
            The purpose of this bulletin is to notify you of the negative impact
   involving the process of roll sharpening Boron steel blades.
             Earth Metal blades now supplied by CNH as well as other major
   suppliers like John Deere, Sunflower, and Kruse are made from Earth Metal
   steel alloy with added Boron.  These blades have longer wear than high
   carbon steel disk blades and the previous Earth Metal Steel disk blades
   with out Boron.  CNH has been made from Earth Metal Steel with Boron
   since January 2002 and will have "Made in Canada" stamped on them.
              As the blades become dull one common method of re-sharpening
    blades is rolling the edges.  Rolling of Earth Metal Boron blades can result
    in cracking near the edge of the blade caused by the "cold working" during
    the rolling process and or breakage of the "cold worked" edge in later field
    use.  We have been informed that cracking and breaking of roll sharpened
    Earth Metal Boron disk will not be covered under warranty by CNH. The
    Rolling method is NOT RECOMMENDED for Earth Metal Boron blades. It
    appears that grinding or shaving methods may be suitable for
    re-sharpening these blades if the blade is not overheated by the
    sharpening process.