Kenworth T660 Cummins ISM ISX Schematics Manual PDF The Schematics Manual set for Kenworth T660 Cummins ISM ISX A set of 21 PDF files contains detailed electrical diagrams and schematics. To avoid any problems during the download, the files are compressed with WinRAR archive into the single RAR archive file. If for some reason, you can't extract the files, we can send you uncompressed version.Brand: KenworthCategory: Heavy Technics + Repair Kenworth T660 Service Manual | TruckManuals This is a great factory service manual for the Kenworth T660, which includes all the information as noted below. This manual comes to you in a secure log-on & password. A wonderful space saver, no longer do you need to find extra book shelf space for this service manual.