Moparmike Posted April 15, 2021 Share Posted April 15, 2021 Ok guys dump truck 425/65/22.5 steer tires Truck has a bad bounce from 30 til bout 50 then it kinda settled down But it is not comfortable driving bouncing inside Had a alignment down it was out plan to put on new steers next week Was going to Tru and balance tires thats on it but I'm just going to replace Any thing I should be looking for King pins are good It's a stiff bounce like from side to side not back to front Thanks for any help Quote Link to comment https://www.bigmacktrucks.com/topic/66536-2000-rd688-front-end-bounce/ Share on other sites More sharing options...
OldRedMack Posted April 15, 2021 Share Posted April 15, 2021 If alignment and tires don't cure, might be a bad wheel that is out of round or you might need new spring packs. I've never really noticed any difference with new shocks compared to worn shocks. Also check the motor mounts, they normally make more of a banging sound when they are worn, but if they are shot possibility that it could perpetuate the bouncing. That was a lot of words to say in my experience a speed related bounce has almost always been tire and wheel related. Quote Link to comment https://www.bigmacktrucks.com/topic/66536-2000-rd688-front-end-bounce/#findComment-472517 Share on other sites More sharing options...
880joe Posted April 15, 2021 Share Posted April 15, 2021 Might also check for loose wheel bearing Quote Link to comment https://www.bigmacktrucks.com/topic/66536-2000-rd688-front-end-bounce/#findComment-472519 Share on other sites More sharing options...
fjh Posted April 15, 2021 Share Posted April 15, 2021 10 hours ago, OldRedMack said: If alignment and tires don't cure, might be a bad wheel that is out of round or you might need new spring packs. I've never really noticed any difference with new shocks compared to worn shocks. Also check the motor mounts, they normally make more of a banging sound when they are worn, but if they are shot possibility that it could perpetuate the bouncing. That was a lot of words to say in my experience a speed related bounce has almost always been tire and wheel related. on rare occasion seen drums out of balance ! Quote Link to comment https://www.bigmacktrucks.com/topic/66536-2000-rd688-front-end-bounce/#findComment-472530 Share on other sites More sharing options...
doubleclutchinweasel Posted April 15, 2021 Share Posted April 15, 2021 I've seen worn tie rod ends cause a side-to-side shake. But, you would hope the alignment guy would have checked that. Most common though is wheel or tire...especially if it "didn't use to do it". Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/66536-2000-rd688-front-end-bounce/#findComment-472533 Share on other sites More sharing options...
Happy Tissues Posted April 16, 2021 Share Posted April 16, 2021 A bad brake drum can cause a weird vibration as well. Some of the cheaper aftermarket drums aren't well balanced. A clump of dirt stuck between the brake drum and the wheel can cause a speed related wobble. Only dealt with this on budd or hub pilot wheels. If you've got spokes on the front then jack up the front axle and spin each wheel by hand to check the alignment. Not everybody is well versed in the old stuff and it could be wobbly. Quote Link to comment https://www.bigmacktrucks.com/topic/66536-2000-rd688-front-end-bounce/#findComment-472574 Share on other sites More sharing options...
Phase 1 Posted April 26, 2021 Share Posted April 26, 2021 I was thinking because it is a dump truck, possibly a stone caught between the duals. But you have probably checked for that. Quote Link to comment https://www.bigmacktrucks.com/topic/66536-2000-rd688-front-end-bounce/#findComment-472981 Share on other sites More sharing options...
Moparmike Posted April 29, 2021 Author Share Posted April 29, 2021 Took front wheels off looked at drums They have holes that are way bigger then the stud Centered them best I could put wheels back on bounce is not completely gone but it better I think I'm going to get so.e new drums new tires balanced and hopefully it's gone completely Thanks guys for your help 2 Quote Link to comment https://www.bigmacktrucks.com/topic/66536-2000-rd688-front-end-bounce/#findComment-473112 Share on other sites More sharing options...
Joey Mack Posted April 29, 2021 Share Posted April 29, 2021 (edited) 425 is a bigass tire... rekon you have a broken belt in the tire? is this an RD? whats the bolt pattern? budd, spoke, piloted? Edited April 29, 2021 by Joey Mack More content needed Quote Link to comment https://www.bigmacktrucks.com/topic/66536-2000-rd688-front-end-bounce/#findComment-473117 Share on other sites More sharing options...
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