I have a Cub Cadet 3225 that first had the mower deck hydraulic lift quit working. Then the hydrostatic transmission quit working at full speed. Then the power steering quit working. Where might our problem be? The fluid is full & clear. Is it the main pump or the valve on the side next to the transmission? I'm at a loss. 
I see on the parts list that is also has a pump at the base of the steering column. Any ideas on where to look first?