I've read on here during the last summer, people having trouble with their Cub Touch Control systems, so I thought I'd post the page from the Cub owner's manual telling how to change the fluid, and get the air out of the system. The Cub owner's manual has a lot of info, for those of you that haven't read one, more service info than a car owner's manual usually has. The manuals are on this site, at the top of this page. IH doesn't say how often to change the fluid, it is a sealed system, it doesn't have much exposure to air, the oil in the engine oil pan would have lots of exposure to air, as an example.
But it does need changing once in a while. Is every 5 years enough changing? What do the experts here say? You probably know, click on the pic to make it bigger to read. Glen.http://www.cleancomputes.com/Cub/Cub%20 ... age-67.jpg