rxhawg Posted March 29, 2012 Share Posted March 29, 2012 We have a '97 CH613 (pulling end dump) that shakes like crazy when you hit the brakes. Things we have tried: new steer tires (balanced), new brake shoes and drums, front end alignment, new gear box on steering colunm. There may be a thing or two more that we have tried but that is all I can remember off the top of my head. Nothing has fixed the problem. We are going to replace the shocks tomorrow but I don't hold out much hope of that being the cure. Do any of you mechanically minded folks have any suggestions as to what we should look at next? My mechanic and mechanically minded brother and dad are all stumped. (I don't know enough about the mechanics to be stumped !!) Thanks. Quote Link to comment https://www.bigmacktrucks.com/topic/24157-1997-ch613-front-end-shakes-when-you-hit-the-brakes-help/ Share on other sites More sharing options...
David Posted March 29, 2012 Share Posted March 29, 2012 How's the alignment? Quote Link to comment https://www.bigmacktrucks.com/topic/24157-1997-ch613-front-end-shakes-when-you-hit-the-brakes-help/#findComment-110842 Share on other sites More sharing options...
rxhawg Posted March 29, 2012 Author Share Posted March 29, 2012 Alignment is good. Quote Link to comment https://www.bigmacktrucks.com/topic/24157-1997-ch613-front-end-shakes-when-you-hit-the-brakes-help/#findComment-110847 Share on other sites More sharing options...
Rob Posted March 29, 2012 Share Posted March 29, 2012 We have a '97 CH613 (pulling end dump) that shakes like crazy when you hit the brakes. Things we have tried: new steer tires (balanced), new brake shoes and drums, front end alignment, new gear box on steering colunm. There may be a thing or two more that we have tried but that is all I can remember off the top of my head. Nothing has fixed the problem. We are going to replace the shocks tomorrow but I don't hold out much hope of that being the cure. Do any of you mechanically minded folks have any suggestions as to what we should look at next? My mechanic and mechanically minded brother and dad are all stumped. (I don't know enough about the mechanics to be stumped !!)Thanks.Does this happen with a light application of brakes when the truck is empty, or just a hard application when the truck is loaded? How about bobtail, and with empty trailer as opposed to loaded? If the vibration is unusually strong with a heavy brake application it could be the front wheel bearings are fretting, or brinnelling along with the races. Either case they need replaced. A magnifying glass and a strong light will give a good indication of wear. Things like color differentiation, chipping of the roller edges, or slight pinholes are dead giveaways to failure. Look closely at the spindle also for evidence a bearing has spun on the bearing surface. Seen this a few times.If the truck has many miles you can't go wrong replacing the bearings anyway.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/24157-1997-ch613-front-end-shakes-when-you-hit-the-brakes-help/#findComment-110862 Share on other sites More sharing options...
theakerstwo Posted March 29, 2012 Share Posted March 29, 2012 This is a 97 so it will be hub pilot. I have seen some hubs that has had the wheels run loose and the pilot is not all there. This can let the brake drum and wheel be off center.If so you can get a centering tool for the studs when you tight the nutsthe wheel and drum will be centered.Look at hat some more.I have seen it a few times and in most cases some one wants to sell you a hub but not need always. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/24157-1997-ch613-front-end-shakes-when-you-hit-the-brakes-help/#findComment-110866 Share on other sites More sharing options...
Timothy B Demarco Posted May 6, 2012 Share Posted May 6, 2012 check your spring pins or loose u-bolts or bad drag link. Maybe bad kingpins Quote Link to comment https://www.bigmacktrucks.com/topic/24157-1997-ch613-front-end-shakes-when-you-hit-the-brakes-help/#findComment-117901 Share on other sites More sharing options...
Timothy B Demarco Posted May 13, 2012 Share Posted May 13, 2012 replace the quick release valve for the front brakes. Make sure the crack pressure is .10 Quote Link to comment https://www.bigmacktrucks.com/topic/24157-1997-ch613-front-end-shakes-when-you-hit-the-brakes-help/#findComment-119148 Share on other sites More sharing options...
Moms Trucking Posted May 16, 2012 Share Posted May 16, 2012 King pins? We have had that happen with worn king pins in the past. Quote Link to comment https://www.bigmacktrucks.com/topic/24157-1997-ch613-front-end-shakes-when-you-hit-the-brakes-help/#findComment-119592 Share on other sites More sharing options...
Stingray698 Posted May 18, 2012 Share Posted May 18, 2012 by alignment has truck had a tandem alignment or just toe set? also steer shaft u joints , have you checked for equal brake stroke with a tape measurement on steers , also what about on the hubs where the drum rides is there a bunch of alumin oxidation on hubs , what about anchor pins/ roller bushings/scam bushings in brakes , those three things get overlooked quite often people just keep replacing just the shoes and drums , Quote Link to comment https://www.bigmacktrucks.com/topic/24157-1997-ch613-front-end-shakes-when-you-hit-the-brakes-help/#findComment-119853 Share on other sites More sharing options...
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