My JD mower was having problems with the blades not engaging At first I could just reach under the das and jiggle the plug where it plugged into the switch and that would work. That ceased to work so I bough a new switch. no results. However I notched for some possibly unrelated reason all the fan blades on the transmission cooling fan were knocked off right where the mower was sitting when I installed to the new switch. The mower starts and runs fine but no blades engaging. Any ides would be greatly appreciated.