mcratchet1 Posted October 12, 2021 Share Posted October 12, 2021 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 Quote Link to comment https://www.bigmacktrucks.com/topic/68466-clutch-fan-humming/ Share on other sites More sharing options...
Joey Mack Posted October 12, 2021 Share Posted October 12, 2021 (edited) 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 October 12, 2021 by Joey Mack More content needed Quote Link to comment https://www.bigmacktrucks.com/topic/68466-clutch-fan-humming/#findComment-481233 Share on other sites More sharing options...
mcratchet1 Posted October 13, 2021 Author Share Posted October 13, 2021 No pto in front yes I’ll try that I’ll take the belts off and see thanks Quote Link to comment https://www.bigmacktrucks.com/topic/68466-clutch-fan-humming/#findComment-481262 Share on other sites More sharing options...
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