Need Help With 80 Hydro Tractor

[alsparl]

I am currently going through my recently acquired Cadet 80 Hydro tractor and am coming up to something I need clarification on. I understand the tractor pretty well uses a 2-part drive mechanism consisting of the actual hydrostatic transmission and the gear reduction drive unit. From what I am reading in the manuals, both take Hytran as the suggested fluid. Because I have no idea when these fluids have been serviced last, I am draining them and putting new in.

When I pulled the plug on the gear reduction unit, it wasn't hytran that came out, but it was gear lube. There was Hyrtan in the hydrostatic transmission though.

1. It is draining overnight; however, is it recommended to remove the unit all together to clean it or leave it?
2. Since it had gear lube in it, should I put gear lube back in or fill with Hytran? If I put Hytran in it, will it cause any issues with it mixing with any residual of the gear lube?
3. Is there anyway to complete drain the Hydrostatic transmission as well?

I am asking the experts here because I have never had the opportuntity to work on a machine of this era and make up and I want it to stay around. Any suggestions or assistance would be greatly appreciated.

Thanks!

[alsparl]

Well I figured it all out by taking the time to completely dissemble the rear end. I took the rear wheels and fenders off, which allowed me to remove the entire transmission assembly. There is a fill plug on the backside of what is considered the gear drive reduction assembly, but is not viewable until you remove the hitch plate. The is also a fill plug on the top of the hydrostatic transmission. So, I remove the unit and drained the old brown hytran out of the hydro. After draining the gear lube out of the reduction unit and letting it drain for 4 days in a 90 degree garage, I filled both with the proper amount of Hytran. All is well and it works great.

[Methos]

Glad you got it figured out Aaron