This International Blue Ribbon Service Manual covers the 815 and 915 Combines. At over 300 pages this service manual contains information on pretty much any problem you could be having with your combine.
The only thing this manual doesn't cover is the engine which is covered in another service manual.
This is the operator's manual for the International Harvester 815 and 915 combines. This manual contains tons of information on trouble shooting, seed loss tables, and more.