Art_H Posted October 21, 2013 Share Posted October 21, 2013 Just looking at getting a 1977 Mack RS600L, with an 18'000 lb front axle. The owner says that he needs to replace the front wheel studs every year. Any reasons for such a short life span?? Is this a common issue??Seems to have the 315 engine and a 12spd.Thanks,Art Quote Link to comment https://www.bigmacktrucks.com/topic/33213-rs600l-1977-breaks-front-wheels-studs/ Share on other sites More sharing options...
rsb502 Posted October 27, 2013 Share Posted October 27, 2013 Loose wheels with worn out holes or worn out hubs. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment https://www.bigmacktrucks.com/topic/33213-rs600l-1977-breaks-front-wheels-studs/#findComment-213576 Share on other sites More sharing options...
br549 Posted October 28, 2013 Share Posted October 28, 2013 F Models we had in the late 70's and early 80's we used to have a lot of front studs brake, we bought the trucks used and replaced 1 or 2 at a time with replacement studs. Finally we replaced all of them at one time with OEM Mack studs and used a torque wrench to 500 lbs & never broke another one. Quote Link to comment https://www.bigmacktrucks.com/topic/33213-rs600l-1977-breaks-front-wheels-studs/#findComment-213785 Share on other sites More sharing options...
theakerstwo Posted October 29, 2013 Share Posted October 29, 2013 F Models we had in the late 70's and early 80's we used to have a lot of front studs brake, we bought the trucks used and replaced 1 or 2 at a time with replacement studs. Finally we replaced all of them at one time with OEM Mack studs and used a torque wrench to 500 lbs & never broke another one.That is what I always tought that was breaking them and that was over torqueing. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/33213-rs600l-1977-breaks-front-wheels-studs/#findComment-213792 Share on other sites More sharing options...
rsb502 Posted October 29, 2013 Share Posted October 29, 2013 The 1"impacts everybody wants to use on lug nuts are ridiculous overkill. When most places started using air to torque lug nuts the 1" guns were rated around 500ft lbs, now they are over 1000 and they're still using them just because they always have. I use a 1/2" or 3/4" to pull mine off and almost always a 1/2" to put them back on. 1 Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment https://www.bigmacktrucks.com/topic/33213-rs600l-1977-breaks-front-wheels-studs/#findComment-213849 Share on other sites More sharing options...
Art_H Posted October 31, 2013 Author Share Posted October 31, 2013 It does seem to be a little odd. The prev owner tried all the different methods of installing the wheel studs etc and torqing to spec...maybe they had the wrong spec...lolWhat would the tq spec be fpr an 18k fornt axle 10 stud? Quote Link to comment https://www.bigmacktrucks.com/topic/33213-rs600l-1977-breaks-front-wheels-studs/#findComment-214184 Share on other sites More sharing options...
rsb502 Posted November 3, 2013 Share Posted November 3, 2013 300-400# on stud pilot if I remember right, hub pilot is stamped on the nut, 450-500#, a whole lot less than a 1" Impact for sure. 1 Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment https://www.bigmacktrucks.com/topic/33213-rs600l-1977-breaks-front-wheels-studs/#findComment-214853 Share on other sites More sharing options...
gearhead204 Posted November 5, 2013 Share Posted November 5, 2013 had a 93 378 pete that would break studs repeatedly,we pulled hubs, drums,and studs refaced hubs and drums on lathe replaced with new studs and nuts also refaced wheels installed and torqued to 475. no more problems, and that was 11 years ago 1 Quote Link to comment https://www.bigmacktrucks.com/topic/33213-rs600l-1977-breaks-front-wheels-studs/#findComment-215127 Share on other sites More sharing options...
Art_H Posted December 11, 2013 Author Share Posted December 11, 2013 I just bought a 600ft lb TQ wrench to be sure for my wheels etc. The front wheel nuts were all over the place 450-550 lbs ish.The nuts do look as though they are sunk into the wheel taper a little. Maybe I'll get some new wheels when I get new front boots...or get them machined. Maybe the plastic spacer in between the wheel and the hub. Quote Link to comment https://www.bigmacktrucks.com/topic/33213-rs600l-1977-breaks-front-wheels-studs/#findComment-220794 Share on other sites More sharing options...
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