I have a sears craftsman riding lawnmower LT2000 model #917.273751 18hp intek engine 42in deck.Engine runs fine but when I release the clutch-brake pedal engine stalls.seems like an intermitent problem because it drove and cut fine but I shut it down then restarted the mower it had the same problem.I am thinking saftey switch but the only one I can find is the seat switch

Contact Sears Parts Direct.com they will help you.

The transmission drive belt is a separate one from the blade belt. The clutch pedal when released puts tension on the transmission drive belt so it tightens up and drives the gearbox pulley by way of a large spring. Make sure the spring is ok. The belts don't last forever and probably needs replacing looking at the age of the machine. That is a fun job as it is right up under the machine and runs from the engine pulley right back to the top of the transmission. You have to drop the deck right off and I usually find a tree with a large branch and haul the front up with a rope or winch so the mower is vertical. Makes it easier to work on. Drain petrol first though. Hope this helps otherwise get a mower shop to do it for you if you feel it's to much of a task. Good luck.

Is the flwheel key ok? Or you may problem like me. Pull
valve cover and see if both pushrods move.

Most likely your seat safety switch is not working. In order for the engine to run with blade engaged, the operator present switch must be made when the brake is taken off (releasing clutch).

The problem is in the seat safety switch or associated wiring. Lift the seat, find the switch, and take a look for a connector that is off, a broken wire, or a loose or broken mounting for the switch. If all that seems ok, remove the switch and put tape across the plunger so it is activated. Run the mower and see if the problem is solved. If not, replace the switch - it's not expensive. Parts are available from Sears online or at their stores. You'll need the model number of your tractor. Good luck! Please rate my solution if helpful.

You need to look at the park brake switch,if there is no debris then you need to replace the switch,if there is then remove the debris and retry.You may also have a bad seat switch,which you can confirm by jumping the plug that goes to the seat with a piece of wire that has been "skin back".Just cross the wires with the jumper you have made and if all is good then order a new seat switch.,

the proper threading of cable clutch for 38 in. craftsman riding lawnmower model 271150

ON TOP OF THE SMALL IDLER PULLEY THE BOLT IS LONG AND IT HAS A HOLE IN THE SPRING GOES ON THAT BOLT AND THEN A WASHER THEN A PIN THAT HOLDS IT IN PLACE

Make sure there is no corrosion on the battery terminal connections and check the fuse and safety switches clutch, brake,seat.
Eric

Your answer was perfect, when I located the saftey switch it was not working properly.

Thanks a million, Ron