In order to help prevent the crawler tracks from climbing on the idler wheel guide ribs, the idler spring (TE746YT) is now being preloaded to 13-3/8 inches, Figure 57A, instead of the former 13-7/8-inch dimension.

This change was effective in production on Model "40" Crawler Tractor Serial No. 66468 and is applicable to all Model "40" 4- and 5-roller Crawlers in the field.