I have a Scotts S2048 (made by John Deere with Kohler 20HP engine). Getting it out of winter this year the engine wouldn't crank.
Figured a dead battery and replaced it. Same problem. Jumped with car battery, engine finally turned over started, but then died (hard stall is a better description).
Read up on common issues - ensured tranny is disconnected and drive belt free to turn, looked for frozen lifters (hydraulic), even pulled the spark plugs to try cranking. Still, engine will not turn (starter engages, makes a belt squeak noise, but no rotation of the crank shaft).
At this point I am assuming the worst, that a rod or crank bearing has seized; but before tossing the engine or replacing the engine was wondering if anyone has any other idea of a simple issue.