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Clutch fan humming


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I have 2006 Mack mr 688s with Horton clutch fan about two years old. It seems like every other day it will start humming almost whistle for a little bit then go away. Only while not engaged. All pulleys and belts are about six months old. Is this a early sign of clutch failure? Any advice would be really appreciated 

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do you have a front drive P.T.O.?   Can you remove the belts and tie them off to the side and try to duplicate the issue? I use a long lengrh of 3/8"  hydraulic brake line as a stethiscope to listen to noises... Jojo

Edited by Joey Mack
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