I have a 2001, so not sure if this applies or not. There should be a switch below the deck at the back end of the linkage that operates the blade engagement. It may need adjusting by way of the threaded rod as it enters the clevis yoke. picture coming shortly. I think you ought to first make sure the adjustments at the forward end are correct, but I could be wrong. One may affect the other.
rotate 90 clockwise for proper orientation.