USMC205 Posted March 21, 2019 Share Posted March 21, 2019 I have an 01 RD688 Dump and it mostly does it when I'm loaded but when I turn sharp I can hear a popping sound coming from possibly the front drive axle. I'm not sure if its a bearing or possibly some splines slipping. I figure if it was something with an axle or rear end it would do it all the time and not only when loaded. I've heard bearings can do that when they are under a load and going bad. Its not a low thud pop but somewhat of a high pitch pop (yes I know this sounds crazy). It will do it a 3 to 4 times in a turn then stop when I straighten out. Suspension bushings were replaced mid last year. King pins and tie rod ends replaced a couple months ago. Ive crawled around and pulled and yanked on everything, all drive shafts, U-joints and torsion bars seem good and tight. Has anyone had this and what was it? Thanks. Quote Link to comment Share on other sites More sharing options...
Lmackattack Posted March 21, 2019 Share Posted March 21, 2019 is it a the power divider kicking in? Quote Link to comment Share on other sites More sharing options...
USMC205 Posted March 21, 2019 Author Share Posted March 21, 2019 1 hour ago, Lmackattack said: is it a the power divider kicking in? I wouldn’t think so. Shouldn’t the power divider only engage when the switch is flipped? Quote Link to comment Share on other sites More sharing options...
Lmackattack Posted March 21, 2019 Share Posted March 21, 2019 I assumed it was a auto power divider. my bad Quote Link to comment Share on other sites More sharing options...
41chevy Posted March 21, 2019 Share Posted March 21, 2019 Both directions or only one? Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment Share on other sites More sharing options...
USMC205 Posted March 21, 2019 Author Share Posted March 21, 2019 6 hours ago, 41chevy said: Both directions or only one? Both. Quote Link to comment Share on other sites More sharing options...
mrsmackpaul Posted March 21, 2019 Share Posted March 21, 2019 Im guessing a Mack back end If so, all drive tyres need to be fairly close to the same size as the power divider on a Mack bogie isnt really a power divider However I would check and make sure the power divider isnt locked first Paul 1 Quote Link to comment Share on other sites More sharing options...
JoeH Posted March 21, 2019 Share Posted March 21, 2019 1 hour ago, mrsmackpaul said: Im guessing a Mack back end If so, all drive tyres need to be fairly close to the same size as the power divider on a Mack bogie isnt really a power divider However I would check and make sure the power divider isnt locked first Paul We rarely have drive tires all the same size, never have. Never had problems with our Auto or manual power dividers. Is it Camelback or air ride? If Camelback, did you replace the trunion bar bushings or the elephant pads? Spoke hubs or bud wheels? Is this a recent problem or has it been doing it for a while? Quote Link to comment Share on other sites More sharing options...
fjh Posted March 21, 2019 Share Posted March 21, 2019 You may have the Mack diff with the mack power divider inter -axle inter diff lock they tend to pop and bang from time to time! 1 Quote Link to comment Share on other sites More sharing options...
USMC205 Posted March 21, 2019 Author Share Posted March 21, 2019 3 hours ago, mrsmackpaul said: Im guessing a Mack back end If so, all drive tyres need to be fairly close to the same size as the power divider on a Mack bogie isnt really a power divider However I would check and make sure the power divider isnt locked first Paul All tires are the same, how can I manually check to make sure it’s not locked in? Quote Link to comment Share on other sites More sharing options...
USMC205 Posted March 21, 2019 Author Share Posted March 21, 2019 1 hour ago, JoeH said: We rarely have drive tires all the same size, never have. Never had problems with our Auto or manual power dividers. Is it Camelback or air ride? If Camelback, did you replace the trunion bar bushings or the elephant pads? Spoke hubs or bud wheels? Is this a recent problem or has it been doing it for a while? Camelback, the elephant pads were replaced, bud wheels. Quote Link to comment Share on other sites More sharing options...
fjh Posted March 21, 2019 Share Posted March 21, 2019 (edited) 45 minutes ago, USMC205 said: Camelback, the elephant pads were replaced, bud wheels. another place to look ! If your wheels are steel one of your wheels may be cracked! If its the inter wheel diff it acts some what like as a posi-trac However ever a little more noticeable on dri ground !You can lock the inter axle out (MOST ) of the time, there is a switch on the dash to lock the inter axle out how ever not always some trucks were built with no lock out feature look for it on the dash! Edited March 21, 2019 by fjh 1 Quote Link to comment Share on other sites More sharing options...
41chevy Posted March 21, 2019 Share Posted March 21, 2019 2 hours ago, fjh said: another place to look ! If your wheels are steel one of your wheels may be cracked! If its the inter wheel diff it acts some what like as a posi-trac However ever a little more noticeable on dri ground !You can lock the inter axle out (MOST ) of the time, there is a switch on the dash to lock the inter axle out how ever not always some trucks were built with no lock out feature look for it on the dash! Funny I was thinking it could be a wheel issue before I read your post Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment Share on other sites More sharing options...
mrsmackpaul Posted March 21, 2019 Share Posted March 21, 2019 (edited) 4 hours ago, USMC205 said: All tires are the same, how can I manually check to make sure it’s not locked in? Jack up one wheel and with the brakes off and the truck in neutral you should be able to roll one wheel some Paul Of course make sure the truck is chocked so it doesn't move when the brakes arent applied Edited March 21, 2019 by mrsmackpaul Safety Quote Link to comment Share on other sites More sharing options...
mrsmackpaul Posted March 21, 2019 Share Posted March 21, 2019 4 hours ago, USMC205 said: Camelback, the elephant pads were replaced, bud wheels. There was a fella on here some time ago that had the same issue and it turned out his elephant ears were some neoprene that didnt have enough flex in them and didn't allow the axles to track properly He replaced them with the correct rubber and the problem was gone Maybe worth looking into Paul Quote Link to comment Share on other sites More sharing options...
USMC205 Posted March 21, 2019 Author Share Posted March 21, 2019 26 minutes ago, mrsmackpaul said: There was a fella on here some time ago that had the same issue and it turned out his elephant ears were some neoprene that didnt have enough flex in them and didn't allow the axles to track properly He replaced them with the correct rubber and the problem was gone Maybe worth looking into Paul It’s been close to a year since they were replaced and I did use neoprene but they have been fine. It’s been going on for a couple weeks. Im gonna get a buddy to drive it in a circle while I walk beside it. I’ll also check everything everyone has suggested. Quote Link to comment Share on other sites More sharing options...
Mack Technician Posted April 23, 2019 Share Posted April 23, 2019 Pull the front driveshaft off the front diff. Split the power divider case by removing flange bolts. Inspect and replace inner cam and peanuts. Outer cam is seldom bad. Reassemble with two rubber bands holding peanuts into cage, rotate slightly as you engage. Clean magnet tray. Fill power divider before running. 1 Quote Link to comment Share on other sites More sharing options...
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