Mower blades engages but when I stop to empty grass they will not

The engaging of the mowdeck is cause an excessive demand of your engine. From that, we can assume your problem is in the deck. Since the power drive is all about belts and it threw the belts, from your information I can only deduce that either an object (stick-wood-rock) has wedge into a position that has stopped rotation of the blades. Also, each blade has a pulley/spindle. These have bearings which must be free to rotate.
A bearing failure or seizing can also cause the problem you report.

Follow safety rules in your manual to insure the engine cannot start. Attempt to rotate each blade to check for free rotation. If the do not you most likely will need to remove the mower deck and check further. An obstruction or seized spindle should be easy to determine and sit repair is easily possible.

Check the drive belt ( not the deck belt).

Sounds like your mower belt needs to be replaced. Good luck.

Check out the grass box safety switch. if not fully depressed it will apply brakes to the blades when in gear. Most mowers are designed with a safety switch to stop the blades, or forward motion if the grass box is not fitted correctly.

Julie this sounds silly but try and run it with the exhaust and muffler removed. If it ticks over and then stops when it's engaged for a few minutes it sounds like its suffocating.

probably the valves have unseated the hotter it run the worser it get warranty defect take to dealer tell what it doing tell him you think its un seated valves and cover under warranty

SOUNDS LIKE YOU HAVE ONE OF YOUR OTHER SWICHES ARE BAD LIKE THE SEAT

check the clutch if it engage then check the cable and belt to if it works make sure all the bolts are tight. usually the belts is too loose or if its a clutch drive maybe the clutch doesn't engage or worn out.

Most likely what you did was burn one or more spots on the belt. When the blades and belt stop turning, like in tall grass, the engine doesn't stop and will burn flat spots on the belt at the engine pulley. Every time the flat spot hits a pulley, it will jump and can set up a bad vibration. Run your hand around the sides of the belt or take it off and you will feel or see the thin spot(s) on it. Replace belt.

Ihave craftsman Lawn Tractor was cutting grass and it stop moving forward or backward. Can you help me