Question for someone more knowledgeable than me. I purchased a 445A Backhoe last year. Lately when I use the front end loader, or the backhoe, in a few minutes it starts making a whining sound. Sounds to me like it's starved for hydraulic oil. I checked the reservoir at the front of the tractor and it was O.K. When I purchased the backhoe, I also purchased a set of service manuals so I looked in those. I then checked the transmission fluid and the rear end. The rear end level was low so I added oil there, thinking finally I found the issue, I didn't. All the filters were replaced before I bought it, so it shouldn't be those. I noticed in one of the manuals that is shows a "screen" at the bottom of the hydraulic tank, and I'm thinking that may me clogged, limiting the amount of oil that can get to the pump. Does that sound reasonable, or am I way off base? There also is what appears to be another pump and filter on the back left side of the engine, but I'm not sure of what it does. As you can tell by this post, I have NO knowledge on how these things work. I bought this so I could "tinker" with it, but the hydraulic side of things is a puzzle to me. Any help would be greatly appreciated. I use this mainly for clearing the snow from my driveway, so if I don't figure this out in a month or so, I'll be calling the dealer to come and fix it.