? about lawn tractor

[Raven]

never heard of a hydro tranny
but create a platform with a ramp
with some Lumber
so you can visually inspect
the underside without it CRUSHING you
and then look for a squashed Line
is the only thing i can suggest

[BigBo]

Hydro Trans = Hydrostatic Transmission = Automatic (no shifting gears)

Sounds to me where you have a lever to engage and disengage the transmission, you may have broken or bent a linkage in that engaging lever down underneath the chassis when you jacked it up. You're going to have to get under there to have a peek at it.