Chris Szilagyi wrote:

You're right, this model has the filler tube coming out the back under
the seat. The tube itself is a weird shape, as it has two really
sharp bends before it goes into the transmission, so it's not actually
straight down. It appears to go into the transmission about at the
midpoint between the top and bottom of the transmission housing
itself. But now that you mentioned the oil level could be up the tube
a ways, that makes sense now. I just wasn't sure how far up the tube
it was supposed to be. I think I'll call the JD dealer to double
check the part # on it. Thanks a lot!

You could also drain the oil completly, then fill it according to the
specs. Then compare that level to the dipstick reading.

--
Tony