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Loud humming sound over engine

I have a 2007 freightliner columbia.When driving I hear loud humming noise,checked bearings,driveline and I joints everything good.only hear it when driving,if I push in the clutch it stops or if I put it in neutral.Please help

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2 Answers

I have a 2009, Freightliner, Coronado, 12.7 S60 Detroit, Eaton Fuller Tranny, in 13th gear, around 62 mph, same humming (perhaps). WOULD LOVE to learn more about possible causes….sorry, no answer, rather encouragement for others to try answering.

Henk Enting

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Check oil level in transmission.

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