Rsc1717 Posted July 30, 2021 Share Posted July 30, 2021 (edited) I have a clunking noise what seems it is coming from driver side . It usually only does it when loaded . It does not happen when turning and I don’t feel it on steering wheel . It’s usually just at take off and also when stopping and coasting like at 2, 3 mph. I did notice today more when going into reverse when loaded and going like at 3 , 4 mph . It seems like every time the wheel rolls you hear it at the same spot. Like rolls once then you hear the clunk. Has anybody experienced something similar don’t know where to start looking . Also this is on a 2014 Mack cxu613 Edited July 30, 2021 by Rsc1717 Quote Link to comment https://www.bigmacktrucks.com/topic/67570-clunking-noise/ Share on other sites More sharing options...
tjc transport Posted July 30, 2021 Share Posted July 30, 2021 the rubber blocks on the springs may have centering pins broke. drove us nuts for three weeks before we found it on the 04 granite. have someone watch the axles when you take off and stop. if they move, the centering pins are probably bad. Quote when you are up to your armpits in alligators, it is hard to remember you only came in to drain the swamp.. Link to comment https://www.bigmacktrucks.com/topic/67570-clunking-noise/#findComment-477677 Share on other sites More sharing options...
Rsc1717 Posted July 31, 2021 Author Share Posted July 31, 2021 1 hour ago, tjc transport said: the rubber blocks on the springs may have centering pins broke. drove us nuts for three weeks before we found it on the 04 granite. have someone watch the axles when you take off and stop. if they move, the centering pins are probably bad. When you say watch the axles are you meaning the back axles as well. Fairly new to the trucking world . Quote Link to comment https://www.bigmacktrucks.com/topic/67570-clunking-noise/#findComment-477681 Share on other sites More sharing options...
Rsc1717 Posted July 31, 2021 Author Share Posted July 31, 2021 1 minute ago, Rsc1717 said: When you say watch the axles are you meaning the back axles as well. Fairly new to the trucking world . Are you meaning we’re the leaf springs tie up to the front axle they a centering pin in the middle or what. I was thinking it was maybe my front spring bushings . Quote Link to comment https://www.bigmacktrucks.com/topic/67570-clunking-noise/#findComment-477682 Share on other sites More sharing options...
mrsmackpaul Posted July 31, 2021 Share Posted July 31, 2021 Sounds like a crook uni or or loose yoke Paul Quote Link to comment https://www.bigmacktrucks.com/topic/67570-clunking-noise/#findComment-477688 Share on other sites More sharing options...
880joe Posted July 31, 2021 Share Posted July 31, 2021 If it's a mack rearend it may be the peanut cluster wore out and slipping Quote Link to comment https://www.bigmacktrucks.com/topic/67570-clunking-noise/#findComment-477693 Share on other sites More sharing options...
tjc transport Posted July 31, 2021 Share Posted July 31, 2021 13 hours ago, Rsc1717 said: When you say watch the axles are you meaning the back axles as well. Fairly new to the trucking world . rear axles. watch to see if the move forward and backward when taking off and stopping. if the center pins on the rubber blocks in the spring caps are broken, the axles will slide on the springs. Quote when you are up to your armpits in alligators, it is hard to remember you only came in to drain the swamp.. Link to comment https://www.bigmacktrucks.com/topic/67570-clunking-noise/#findComment-477702 Share on other sites More sharing options...
Rsc1717 Posted August 7, 2021 Author Share Posted August 7, 2021 Ok seems that I found the issue it’s the front wheel bearing had a guy touch tire while slowly going forward and he told me it jumps . Also stopped while loaded trip and touched that side wheel and was extremely hotter than other side. Come to find out it’s a unitized hub and bearing not sold separately. Well it is sold separately but only 100 dollars less then the whole hub . Hub at dealer $765.00. Is their any Mack techs here I found the bearing and seal on eBay for 185.00 can it be done that way just changing bearings or does the whole hub just have to be changed ? Quote Link to comment https://www.bigmacktrucks.com/topic/67570-clunking-noise/#findComment-478056 Share on other sites More sharing options...
Rsc1717 Posted August 7, 2021 Author Share Posted August 7, 2021 Usually it only does it when loaded or mid day thru work day . I work local hauling belly dump I’m thinking it’s because it gets hotter when loaded and the more use . Have any of guys gone thru one of these or changed one . What problems were you having . Just want to make sure it is this . I’m thinking it is because of the what the guy telling me feeling jumó on tire and also wheel Hotter then the other side Quote Link to comment https://www.bigmacktrucks.com/topic/67570-clunking-noise/#findComment-478059 Share on other sites More sharing options...
D-Day Posted August 7, 2021 Share Posted August 7, 2021 Usually your front tire will tell you if it is wearing oddly with lumps forming on it, jack up that wheel and check it out also check your king pins a loose bearing and worn king pin can cause that noise the heat may be an indicator also but if one brake is slightly tighter than the other that would make a little more heat on one side also Quote Link to comment https://www.bigmacktrucks.com/topic/67570-clunking-noise/#findComment-478060 Share on other sites More sharing options...
Rsc1717 Posted August 7, 2021 Author Share Posted August 7, 2021 17 minutes ago, D-Day said: Usually your front tire will tell you if it is wearing oddly with lumps forming on it, jack up that wheel and check it out also check your king pins a loose bearing and worn king pin can cause that noise the heat may be an indicator also but if one brake is slightly tighter than the other that would make a little more heat on one side also My tire is wearing evenly I did change my tires because they were wearing bad on 3/25 of this year . And never really found the issue. I changed my kingpins in may of this year because I really thought that was going to fix this knock and wobble at like 30mph I have now . Quote Link to comment https://www.bigmacktrucks.com/topic/67570-clunking-noise/#findComment-478061 Share on other sites More sharing options...
Rsc1717 Posted August 7, 2021 Author Share Posted August 7, 2021 Just now, Rsc1717 said: My tire is wearing evenly I did change my tires because they were wearing bad on 3/25 of this year . And never really found the issue. I changed my kingpins in may of this year because I really thought that was going to fix this knock and wobble at like 30mph I have now . The clunking noise I feel it when taking off also when I start to slow down and coast at low speeds I here it . Also when driving at let’s say like 60mph when approach a right hand curve I feel like a small pop on the front end . Quote Link to comment https://www.bigmacktrucks.com/topic/67570-clunking-noise/#findComment-478062 Share on other sites More sharing options...
terry Posted August 7, 2021 Share Posted August 7, 2021 are you working this truck with the front end in that bad of shape? sounds like your are! terry Quote Link to comment https://www.bigmacktrucks.com/topic/67570-clunking-noise/#findComment-478063 Share on other sites More sharing options...
Rsc1717 Posted August 7, 2021 Author Share Posted August 7, 2021 11 minutes ago, terry said: are you working this truck with the front end in that bad of shape? sounds like your are! terry Well you dint answer my question or any help terry. But you did answer your own ? I’m trying to figure issue to fix . Thanks 1 Quote Link to comment https://www.bigmacktrucks.com/topic/67570-clunking-noise/#findComment-478064 Share on other sites More sharing options...
Onyx610 Posted August 7, 2021 Share Posted August 7, 2021 To check the wheel bearing, jack it up have someone push the brake pedal to take any play out and put your hands at 12 and 6 and rock in and out. Quote Link to comment https://www.bigmacktrucks.com/topic/67570-clunking-noise/#findComment-478066 Share on other sites More sharing options...
Onyx610 Posted August 7, 2021 Share Posted August 7, 2021 Maybe take it apart and inspect the bearing and also make sure the axle nut is tight/still locked in place? Quote Link to comment https://www.bigmacktrucks.com/topic/67570-clunking-noise/#findComment-478067 Share on other sites More sharing options...
mrsmackpaul Posted August 7, 2021 Share Posted August 7, 2021 3 hours ago, Rsc1717 said: Usually it only does it when loaded or mid day thru work day . I work local hauling belly dump I’m thinking it’s because it gets hotter when loaded and the more use . Have any of guys gone thru one of these or changed one . What problems were you having . Just want to make sure it is this . I’m thinking it is because of the what the guy telling me feeling jumó on tire and also wheel Hotter then the other side To answer your question about changing a wheel bearing, I have9changed one of this particular wheel bearings myself That been said I see no reason it would be different to any other wheel bearing Jack it up Block it so it can't fall down and is safe to work on Back the brake off Undo cap on the hub and remove the two big nuts and washers remove wheel and hub as one Remove bearing bits from hub and axle, including the seal Clean everything Reassemble in the reverse When tightening the big nut, do up tight then back off one and a half flats Assemble the remainder, fill with oil Re adjust brake drive away Or at least thats how I would tackle it if it was mine I hope tuts is of some help Paul Quote Link to comment https://www.bigmacktrucks.com/topic/67570-clunking-noise/#findComment-478070 Share on other sites More sharing options...
Onyx610 Posted August 7, 2021 Share Posted August 7, 2021 Quote Link to comment https://www.bigmacktrucks.com/topic/67570-clunking-noise/#findComment-478071 Share on other sites More sharing options...
Onyx610 Posted August 7, 2021 Share Posted August 7, 2021 (edited) Also, if you decide to tackle this job you will need a wheel seal if you are replacing both bearings…which id imagine you would be. Edited August 7, 2021 by Onyx610 Spelling Quote Link to comment https://www.bigmacktrucks.com/topic/67570-clunking-noise/#findComment-478072 Share on other sites More sharing options...
Rsc1717 Posted August 7, 2021 Author Share Posted August 7, 2021 1 hour ago, mrsmackpaul said: To answer your question about changing a wheel bearing, I have9changed one of this particular wheel bearings myself That been said I see no reason it would be different to any other wheel bearing Jack it up Block it so it can't fall down and is safe to work on Back the brake off Undo cap on the hub and remove the two big nuts and washers remove wheel and hub as one Remove bearing bits from hub and axle, including the seal Clean everything Reassemble in the reverse When tightening the big nut, do up tight then back off one and a half flats Assemble the remainder, fill with oil Re adjust brake drive away Or at least thats how I would tackle it if it was mine I hope tuts is of some help Paul This bearings come unitized they don’t require oil . It’s a Mack unitized hub . I don’t know why they did it like that but that’s what this is . Quote Link to comment https://www.bigmacktrucks.com/topic/67570-clunking-noise/#findComment-478073 Share on other sites More sharing options...
mrgumby Posted August 7, 2021 Share Posted August 7, 2021 Quote Link to comment https://www.bigmacktrucks.com/topic/67570-clunking-noise/#findComment-478075 Share on other sites More sharing options...
mrgumby Posted August 7, 2021 Share Posted August 7, 2021 Quote Link to comment https://www.bigmacktrucks.com/topic/67570-clunking-noise/#findComment-478076 Share on other sites More sharing options...
mrsmackpaul Posted August 7, 2021 Share Posted August 7, 2021 1 hour ago, Rsc1717 said: This bearings come unitized they don’t require oil . It’s a Mack unitized hub . I don’t know why they did it like that but that’s what this is . Oh okay my misunderstanding, so they are sealed bearings then, I best but out of this as I haven't seen this hub before Paul Quote Link to comment https://www.bigmacktrucks.com/topic/67570-clunking-noise/#findComment-478078 Share on other sites More sharing options...
Dcarter50 Posted January 11, 2023 Share Posted January 11, 2023 Hello I have a 06 Mack Vision and I keep hearing a rattling noise from under the cab, almost dead center of it. It comes and goes, but I hear it mostly when accelerating. Any advice helps, thanks Quote Link to comment https://www.bigmacktrucks.com/topic/67570-clunking-noise/#findComment-520875 Share on other sites More sharing options...
Joey Mack Posted January 11, 2023 Share Posted January 11, 2023 Is there a loose heat shield on the exhaust? Is the floor pan around the shifter loose? Day cab or Sleeper truck? Quote Link to comment https://www.bigmacktrucks.com/topic/67570-clunking-noise/#findComment-520885 Share on other sites More sharing options...
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