This should be equivalent to a Stevens Model 66A. Try Savage (savagearms.com) or Numrich (e-gunparts.com) for parts schematics, but I doubt if it came with an owner's manual - 50 years ago Sears wasn't worried about being sued because someone couldn't figure out how to use their products. Hate to contradict myself, but just found this site which indicates it was made by Hi Standard, and some manuals are available.
If you go to sears partsdirect and put in your model number you can get an owners manual directly from them. http://store.chainsawr.com/
You can get it here:
go to the store and ask for the manual
go to the sears website
You can download the manual at Sears website, service and support. Pretty straight forward.
In batemans shearing edition 1995 ------------------------------ The manufacture of the product would be the one to get the manual from, that being Sears.
The Sears 2C was made by Winchester and is basically the same as the Winchester Model 131. Owners manuals might be found online at one of the auction site like eBay or GunBroker. We have parts available. sales@countrygunsmith.net
The owner's manual for the Sears Garden Tractor model number 917255910 can be viewed on the official Sears Parts Direct website. This is an 18 horsepower tractor.
Sears parts direct... http://www.searspartsdirect.com/partsdirect/index.action
http://www.histandard.info/manuals/sears/pashotguns/index.html
Sears does not have the owners manual available, however, they do have the illustrated parts manual. If you call sears they will likely send you one free if it is still in print or they have one in inventory. Please click on the link below to visit the sears illustrated parts manual.
check at managemylife.com