Small Engines (Lawn Mowers, etc.): JD LT133 transmission problem, tractor wheel, transmission problem

Question
When I put the manual trams into gear it dies . It's like it locked up. When neutral  I can push it , when in gear I can't push it , like has locked up . When I elevate the tractor wheel s turn fine in gear . I tried to start it with wheels elevated , but can't figure out how to by pass seat sensor. Any thoughts on what is wrong.

Answer
In gear you should not be able to roll the mower.

Look under the mower at the transmission and let me know what model you have.  This link will help you locate transaxle model number.

http://www.wfmfiles.com/download/Tecumseh-Peerless_Motion_Drive_System_-_Transmi(691218).pdf

Let me know the transaxle model so I can provide some tips.
Eric