I have a Craftsman 19.5hp 42in deck lawn tractor problem. The tractor starts ok but when I release the brake it shut down.

i would look under sears/craftsman web sight or google this for manual.im sure there will be one.

There are other safety switches as well. The electrical diagram shows (2) of the interlock switches (part no. 16 in diagram) in the electrical system. The location of the 2nd one could be on the transmission or the clutch/brake pedal. It could also be on the PTO system (blade actuator if you will). See if you can find the other switch on your unit. I have an LT1000 and have NOT looked for them. Here is an electrical diagram on your unit.

http://www.searspartsdirect.com/partsdirect/part-model/Craftsman-Parts/Riding-mower-tractor-Parts/Model-917273751/0247/1509200/P0403265/00001?blt=06&prst=&shdMod=

Copy and paste this web site into your browser.
http://www.managemylife.com/mmh/owner_manuals/27240/CRAFTSMAN-Lawn,-Tractor-L9080013?brand_name_search=917258562+CRAFTSMAN
Page 22
If the link doesn't work, go to www.searspartsdirect.com Put in the model number of your tractor. Then look to the right for a button for a manual. Click there.

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.

the safety switch is under the frame of your mower look under the frame follow the clutch rod then you will find the switch.

the brakes on the deck belt not working belt to tight or deck not fully disengaging

google it

It could be the brake switch bad, if this model came with one. When it is depressed it will start, but when it is released it may not be switching to stay running.

Check that the seat switch is functioning, pull the seat up and put a paperclip in the switch and try it that way if it works then you need to replace the safety seat switch.

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

Thanks a million, Ron