Looking for the manual.
I need to replace traction belt

I can't seem to find that model number, however if you go here to search for your manual by model number.

You can also try 1-800-668-1238 to contact the company.

Hi,
I too find nothing with a 597 vendor number, however I did find a number of parts breakdowns from 1985 (135) with the 698 frame designation at Outdoor Distributors at:
Outdoor Distributors - Lawn Mower Parts
Peace,
Clarke