Motor seems to be seized

Likely a thermal switch in the motor. Trick is determining if the motor is actually over heating or a defective thermal switch.

check/replace the start/run capacitor/s
check that the hydraulic pump is not seized

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you can buy them new at Troybuilts website

http://www.fleetfilter.com/filter/wix-oil-filters/51551.html
These are the filters that you need for this application.

first job is to check the part load and main beather hoses are ok the stability system light may be a false indicator if the engine has stalled best is to get fault codes out of the ecm with a code reader to help but air leaks on the engine inlet side can cause strange/seeming unrelated symptoms

Is this a two speed or a 4 speed ... it is a MTD built Troy or a Troy built Troy or do you know?

There were two versions of Horse built in Troy, New York bu Gardenway ... the two speed and the 4 speed. The two speed used two belts the same size while the 4 speed used one belt on different sized pulleys. There was also a variation that used a slip gear ... this model was built to accomodate other accesories ... log splitter and generator.

If yours is a Troy Built from Garden Way, I can help you. If this one is from MTD, I'm not so sure. Can you ID your machine for me please?

First of all, I hate to, but have to ask, have you verified oil level is up to proper level? Have you checked power at directional solenoid when handle is moved to different directions, as well as released? Obviously when handle is in stop position, there shouldn't be power to motor in either direction. I can't see exact model, or design obviously,but that would be a good place to start.

remove the float bowl from the carburator and clean it out. Either the float is stuck of the needle valve is gummed up. Both the float and needle valve together regulate the fuel allowed into the bowl, if they dont allow fuel in or allow it in fast enough, the engine dies. Also check for a fuel Screen in the fuel tank, it may be plugged up.

remove the spark plug.  And pull the cord again.  if the carb float is stuck down or you overfilled the oil you could be hydro-locking the engine.  Check.