RamblerRebel
New User
I have a 1976 Ford 550 Backhoe Loader that has noise somewhere in hydraulic system. All hydraulics are working fine, but at certain RPM ranges noise comes from under the rear main control valve area. This noise occurs when speeding up or slowing down. It gets quite loud with movement of loader in conjunction with movement of machine. For instance, raising or lowering loader while pushing at the same time. Also noisiest while raising/tilting or dumping and moving at the same time. Like the more hydraulic pressure put on some valve or valves someplace makes it rattle or vibrate. I can minimize the rattling by lifting /tilting at idle and while not increasing engine speed or machine movement. No noise comes from front hydraulic pump. Hope someone has knowledge of the Ford 550 hydraulic system and can give me an idea of what the problem may be.