[Mark / Ohio]

FYI you can still purchase manuals for it here:

John Deere Technical Information Bookstore - Home Page

I did some digging on the net and found this thread in another forum:

Best John Deere Hydrostatic transmission oil? - Bob Is The Oil Guy

Sounds like your tractor has a transmission like this one:

http://hydraulics.eaton.com/products/pdfs/E-TRLD-TM001-E.pdf

Hope this helps.

 

[Mark / Ohio]

Don't know for sure. I think some have a drain plug in the bottom. The one picture in the .pdf file shows a bleeder/drain plug on top behind the reservoir. That will be something else you'll need to know if you change the fluid and/or filter. What the procedure is for bleeding the air out of the system to get it to work right.

Here's a thread I found over at MTF which I think would also apply to your model:

hydro 175 - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information

Cut and pasted text from a post in that thread:

Remove the mowing deck.

Differential
- drain
- replace drain plug
- fill with 0.7L (1.5 pt) of SAE 90 into upper fill plug (front of diff)
- oil should be a short distance below the fill hole
- replace fill plug

Hydro
- clean off transmission to prevent contamination (requires removal of fender deck and fuel tank, etc.)
- drain (I assume there's a drain plug on the bottom)
- remove vent plug beside reservoir
- add new oil (SAE 30) until oil appears at vent
- rotate input & output shafts to release trapped air
- add more oil until oil reappears at vent
- reinstall vent plug
- fill to 140mm below reservoir top (full mark).

I've never personally owned or worked on a 100 series Deere myself. My LT150 is a totally different setup with a Tuff Torq K46.

(I wish I had your much more robust tranny on it. )

 

[Mark / Ohio]

1.4 Liter (rounds to 1.5 quart)

http://www3.kawpowr.com/enginesecure/ServiceManuals/FB460V.pdf