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I have a twin disc MG 5050SC attached to a Cummins 270B in a Nordic Tug. The transmission has been in service for 13 years/3000 hours, and recently developed a leak/small drip from the gasket between the oil pump and the transmission. I have replaced the gasket without effect, even trying various gasket sealers. The leak appears to occur, or get worse, when the transmission is engaged. There is no evidence of cracking on the pump or transmission attachment pad. I am beginning to think that the leak is pressure related and that I may have an issue with the pump shaft seal or the transmission control valve allowing pressurized oil into the cavities between the pump and transmission. Any thoughts?
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