Look for the pulley on top of the transaxle to be slipping,they have a spline that can wear out over time. The pulley is designed to be "sacrificial" so the transaxle splines are not damagedbud_oscar said:Don’t know if it has one of those little doohickeys that you push in (or pull out) to manually push the beast, but on my lt180 I had a similar problem because of that mysteriously having been pushed in, thus disengaging the transmission.