JD 450c steering issue

[njthor]

This is my first dozer so I am all new to this type of equipment. I just bought the dozer last week and now I am finding out all the small problems it has. Able to fix most of them but I now have a steering problem. It occurs when the dozer in at a angle. On flat surface I do not seem to have the problem. Also it does not occur all the time it seems to be some what random. So here is the problem.....When I pull back on the right stick the dozer stops. The left track does not turn. With or with out a load. On flat ground it turns fine. I checked the fluid and the level is fine. However it is a little milky. So I think some water has gotten in there. I want to change the fluid (hoping that will fix the problem) Is the drain on the bottom of dozer? What type of fluid and how much? Also is there a left and right side to fill? When I checked the fluided under the seat there was just one dip stick in the middle so I assumed it feed both sides but I keep reading about two different compartments. My last question is is there any easy adjustments for my turning problem if the new fluid does not work? Also is there a cheaper PDF manual around for this machine hoping not to drop $200 just for a manual Thanks for any help you can give...