Thank you the pre-screen was very clogged up in my 2240. Cleaned screen, changed fluid & filter noise gone thanks for your help.Sounds like either low hydraulic fluid, fluid with too high of a viscosity, an air leak in the suction hose, or clogged up hydraulic suction filters. My bet would be on the last two. Are you seeing any fluid dripping when the tractor is not running? How many suction filters does that closed center system have?