Small Engines (Lawn Mowers, etc.): Lawn Chief wont move in gear!, lawn chief, hydrostatic drive

Question
I was mowing with my 11HP Lawn chief when it suddenly stopped moving forward. I could easily push it when in neutral. Today when I tried it it would move in all the gears. I mowed with it only a short time and it stopped again. (The drive belt was replaced in July.) Do you have any idea what is going on?

Answer
 Hello Cheryl:

 Is this a Hydromatic or Hydrostatic Drive Transaxle? Is there any Smoke when it Stops Pulling? Send me the Model Numbers Off the Mower, Please. With these, I can Locate a Breakdown/IPL of the Mower and Better Assist you. Thanks.

 Respectfully

 John