I noticed a milky appearance to the trans/hyd. fluid in my ym155 after using it with a small (6) disc implement to make rows. The transmission started making some noises. After shutting down the engine to investigate, the engine did not want to run for very long. The next day it seemed to run better when unloading from a trailer. One thought I had was that water had contaminated this fluid. Another was that the fluid some how broke down. The fluid had been replaced within a couple of months before this use with Autozone JD 303 compatible. Also the very dirty screen filter had been cleaned. I intend to replace the fluid again before the next use. The fluid leaks some in my garage as seen on the floor. Any thoughts?