Been working with my Cub Cadet 1512 bought used at an auction. Changed the hydro oil and filter. Put in Northland HyTran 15-40 oil. New trunnion springs and button ends. Linkage adjust and is snug. Tried it and worked fine but did not mow with it, just ran up and down a incline in the yard several times. Today went out mowing and it worked fine as I started down an incline and various grades up and down. Once the oil got hot it started to free wheel on the down grade again. Would almost come to a stop, then the hydro would catch up, give a jerk and off it would go again. Pulls great up the same incline, which is about 5% grade.
Due to the fact it worked fine when the oil was cold and started acting up when the oil got hot, I am thinking there is just enough wear in the hydro that it looses pressure with the thin oil. (Hour meter quit working at 1258.) Had a similar situation with a bail accumulator a few years ago. Ran about a quart to 2 gal. of Lucas Oil Treatment and no more problem.
Anyone have any ideas?
Thinking of draining about a cup full of fluid out of the hydro and add a cup of the Lucas Oil Treatment and see what happens. Appreciate your thoughts on this.