6000 4wd. Purchased Paynes forks recently to aid in moving lumber bundles during fence construction over last month. Last weekend, I went to move the last bundle of pickets, and the bucket under the load, would not roll back all the way, and the lift seemed weaker. Have I damaged the hydraulics in some way. Suggestions? Pump, filter? I have seen some posts referring to a screen that may need cleaning. Where is this screen located? Is the power steering pump adjoined/in tandem with the hydraulic pump? I have not had time to investigate all this, but thought I might get some help that might save some time from you folks. Thanks