I have a Tuff Torq hydrostatic transmission (model: 7A646084591) that I'm suspicious of, but I can't quite figure out the best way to troubleshoot. I'm looking for a way to determine if:
- The transmission has something wrong with it internally and needs service/replacement or
- The transmission is working correctly but just under increased load and seeking "even pressure condition" (as described in this cub cadet post).
I'm totally green with this kind of thing, so any telltale signs to look for or other troubleshooting steps would be appreciated. I'm hoping I can determine that I don't need to replace the transmission...
What I've tried:
- The transmission was making a whining noise, so I pulled the vent cap and topped of the oil. I contacted Tuff Torq they reccommended using TuffTech Oil (Part # 187Q0899000), but said it's a 10W-30 base oil, so I just used that. After refilling it lost some fluid (assuming through the vent cap, because I put too much in) but it hasn't leaked since the first top-off.