Where can you get an owners manual for a sears garden tiller model 917.628040?

Usually you can go to the service center that services the Sears products and order one. Take the serial and model number with you. I have done this several times. Sears has a web site now that you might be able to order from also. The cars I has say to call 1-800-4-my-home or visit
www.sears.com/parts. I hope this helps you. Good luck.