you may have the transmission arms attached wrong, or you may have put the blade arms on when it wasn't in the park position - electric or vacuum? the electric park switch can only work one way if the unit was put together right ... you'll find a bit of info on it in the shop manual

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics