Mack Technician Posted May 24, 2019 Share Posted May 24, 2019 5 hours ago, R.E.D said: Yes it is .I hate to throw parts at a problem without properly diagnosing the issue but if I can't see anything rubbing against belt today , I'll be changing that plastic idler pulley in order to eliminate variables. If you replaced a lateral fray belt without replacing Idle pulley & tensioner along with it then your were throwing parts at it. Since it's interior fray check for bolts backing out into the belt path or, as I recall, that shroud support bracket that runs through the proximity of everything on right side. Quote Link to comment Share on other sites More sharing options...
R.E.D Posted May 24, 2019 Author Share Posted May 24, 2019 I checked for bolts but will recheck thoroughly tomorrow.the shroud support bracket I removed since the belt bent it the first time it came off.i need to hit that bracket with a torch in order to bend it back to place Quote Link to comment Share on other sites More sharing options...
R.E.D Posted May 24, 2019 Author Share Posted May 24, 2019 Update .truck ran the whole day without issues.last two hours of work a/c was on. Quote Link to comment Share on other sites More sharing options...
official-toy Posted December 29, 2021 Share Posted December 29, 2021 What’s the part number for Mack ac 427 alternator/ac belt Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted December 29, 2021 Share Posted December 29, 2021 your Mack dealer wont give you the part #? and I guess the number is worn off the back side of the belt too? there are belts listed at the Partsgeek website.. jojo Quote Link to comment Share on other sites More sharing options...
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