Sounds like the clutch is working fine. There is no spring to separate the plates when the clutch is depressed. Actually, all that it does is takes away the pressure from the pushing the plates together. With the clutch depressed, the two pressure plates and clutch friction disk will spin independently, although they are still touching, they are just "lightly" touching. When you let the pedal up, the plates press back together on the friction disk, and the transmission will grab.
Cub Cadets 682, 1811, 1864, Simplicity Legacy XL 4x4 Diesel with FEL, 60" mower, 50" Tiller