Re: My Simplicity LTH 12.5
Ok, I changed the hydro oil over the weekend on my 12.5 LTH. I now understand why it's not common procedure : )
I drove the tractor backwards onto car ramps to get better look. There were no drain plug of any kind, but I did see hose from bottom side going back to front mounted reservoir. It's white plastic nipple with 1" hex on it. I loosen that out and out came the original hydro oil, all 1.1L of it.
That was the easy part. After reassembly, carefully so no contaminants get in, I tried to fill the reservoir with new oil but it didn't take. There was no natural drain to the transmission nor was there self priming action to suction the oil into transmission. I ended up injecting the new oil using the large syringe used for 2 cycle oil/gas mixing.
Fill up the syringe with new oil, insert the tip into the bottom hole in the reservoir and inject. Repeat ten times to fill up the system. During the process you can see the old oil squirting through the return line as new oil is injected into the system. There was night and day difference in color where the new oil was honey color, the old oil was dark brown. If nothing else, it made me feel better to have done the change.