I am new to tractors and I purchased a Oliver Super 77 with a loader to do snow removal and moving hay around my place. I just got it about 10 days ago so havent used it much yet but have noticed a noise now that is fairly loud when the engine isnt loaded, as in moving or running the hydraulics. I can feel it in the side of the crankcase the most, less in the upper end and doesnt feel like the generator or water pump. First thought was a rod but the noise isnt consistant like a rod which tends to follow rpm, this does speed up some with rpm and is more noticeable at mid throttle versus idle but it more of a clatter type noise or mulitple type rattling if that makes any sense at all! It just doesnt sound like the typical rod sound. It does go away when you start to load the motor, such as letting out the clutch and moving or using the loader. Any ideas on this??