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Mend Sears 139-651 12 Lawn Tractor

Manual for a 12 HP 38" cut riding lawn tractor?

How or where can I secure a manual w/diagrams for my 12 HP 38" cut riding lawn tractor. Purchased in 1990. 6 speed transmatic transaxle. Runs good. Model #139-651. Briggs & Stratton synchro-balanced engine. Approximately 18 years old. Replaced drive belt then had trouble with speed staying in 1& 2 levels. Need diagrams for belt replacements, etc. Thanks for your help.

Truman Christian
March 2009
SearsSears 139-651Garden Tools, Lawn Mowers12 Lawn Tractor

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Sears 139-651 Tractor Manual & Diagrams