macattack Posted May 20, 2013 Share Posted May 20, 2013 just wanting to know if any other mr688s owners know if they have one or two spring wedges. one per front side?mine only has one and i am thinking the original owner had some spring work done on the pass side and didnt replace the wedge on that side. should the wedge be installed thick to back axle or to front bumper?my question is if my caster was out of adjustment because of one wedge would this cause my truck to wobble from 40-45 and after 45 she rides nice. feels like a flat spot on my front tire. but there brand new and checked out fine. i have beads installed and that helped but not a 100%. dont know if it s the cheap made in china HERCULES 425 65r 22.5 fronts or the one wedge misssing.also if i needed a caster adj would my steering wheel shake. because its smooth. happens when coasting also.thanks Quote Link to comment Share on other sites More sharing options...
redrider Posted May 21, 2013 Share Posted May 21, 2013 (edited) Get rid of those Hercules for starters. When I had my shaking issue, the tire shops told me that the tires are sometimes out of round, not necessarily out of balance. Goodyears are garbage. Go Michelin or maybe Bridgestone. You get what you pay for.edit- tire shops only check the tire by jacking it up and spinning it, not when it's on the ground. Weight makes a big difference when you're trying to find a problem. Edited May 21, 2013 by redrider Quote Link to comment Share on other sites More sharing options...
39 Baby Mack Posted May 21, 2013 Share Posted May 21, 2013 I would think it should have one on either side and the fat part goes to the back.Ron Quote Link to comment Share on other sites More sharing options...
macattack Posted May 21, 2013 Author Share Posted May 21, 2013 thanks guys.would an out of round tire smooth out after 45 mph? mine shakes the truck between 40-45 mph after 45 its fine. i would think an out of round tire would always be shaking??or is my thinking wrong. Quote Link to comment Share on other sites More sharing options...
thomastractorsvc Posted May 21, 2013 Share Posted May 21, 2013 The wedges are for the caster anglesymptoms of not enough caster are low speed wandering or weaving at high speedsymptoms of too much caster is hard steering and impact shimmysymptoms of uneven caster will cause it to pull to one sideCaster does not show any tire wear. Quote Robert"I reject your reality and substitute my own." Link to comment Share on other sites More sharing options...
wastenafarmtrucking Posted May 21, 2013 Share Posted May 21, 2013 check your toe. give it 1/8" toe in and see what it does. I've heard many of a mack wobble/bounce being fixed by toe in. Quote Link to comment Share on other sites More sharing options...
41chevy Posted May 21, 2013 Share Posted May 21, 2013 Did the problem exist before the tires were changed? Paul 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...
redrider Posted May 21, 2013 Share Posted May 21, 2013 (edited) thanks guys.would an out of round tire smooth out after 45 mph? mine shakes the truck between 40-45 mph after 45 its fine. i would think an out of round tire would always be shaking??or is my thinking wrong.When I had my issue, the truck would sort of hop at about 5mph and then smooth out. Then right at 50mph(80kmh) it would shake violently, 85-90 kmh it would smooth out again and would be smooth anywhere after that...with Goodyears and Dunlops. Michelins are the only ones that work for me.Negative caster angles would scrub the tire around corners and the steering would not return to centre on its own. Too much positive and the truck will want to keep pushing straight IIRC. To understand caster better, do a search on pirate4x4.com. Those off road guys know geometry the best. Lots of good info on there. Edited May 21, 2013 by redrider Quote Link to comment Share on other sites More sharing options...
macattack Posted May 21, 2013 Author Share Posted May 21, 2013 thanks for all the info gang. i actually never got to drive it with the old tires, but i know they were alot narrower tires on the front.i am gonna swap out those hercules and have the toe in checked. see what gives.thanks again gang. Quote Link to comment Share on other sites More sharing options...
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