Olivetroad Posted February 25, 2012 Share Posted February 25, 2012 I had to reinstall a drive line in a dump truck today and I always have to remind myself by looking at a drawing to be sure I have the drive line in phase or timed correctly - Here is a link to a article on the net about it...................same deal applies with pto shafts on trucks or farm equipmenthttp://jniolon.clubfte.com/drivelinephasing/drivelinephasing.htmlSomeone on a thread was writing about phasing a drive shaft so I thought I would throw this out there 1 Quote Link to comment https://www.bigmacktrucks.com/topic/23476-driveline-phasing-or-timing/ Share on other sites More sharing options...
theakerstwo Posted February 26, 2012 Share Posted February 26, 2012 Here is what i have did for years and have tryed to get the younger guys to do but seems to be too much trouble. Before you pull a drive line down use a spray paint can and spray a red streak down the two joint that your pulling if a two peice or pulling the slip from a single peice drive line. Then its no problem to put it back same way it came down. If he didnt have a virbration when he came in he should not have one when he leaves. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/23476-driveline-phasing-or-timing/#findComment-104052 Share on other sites More sharing options...
Rob Posted February 26, 2012 Share Posted February 26, 2012 I've always used a tire crayon myself.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/23476-driveline-phasing-or-timing/#findComment-104073 Share on other sites More sharing options...
Olivetroad Posted February 26, 2012 Author Share Posted February 26, 2012 My trouble is I once in a while will get a truck that was towed in and the failed at brain surgery tow truck driver will take the whole stinkin drive shaft out - yokes on both ends. One time I got one that he even removed a carrier bearing and dropped the whole damn thing from the transmission back. I always have to kind of take a deep breath and collect my thoughts to get the "Zen and the art of driveshaft phasing" (ZADP) going again when I see such a thing. Quote Link to comment https://www.bigmacktrucks.com/topic/23476-driveline-phasing-or-timing/#findComment-104091 Share on other sites More sharing options...
theakerstwo Posted February 27, 2012 Share Posted February 27, 2012 Our tow drivers dont drop enough drive lines. You dont pull one axle on a mack rears and tow it like you would a rockwell or eaton rears.And then when they pull a drive line they will always pull the slip apart. That would be ok if the new drive shafts had a timing mark on them like the older spicer. Now you have a 50/50 change of having to pay down the road to pull the slip and turn it a half round because some of them will virbrate. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/23476-driveline-phasing-or-timing/#findComment-104213 Share on other sites More sharing options...
David Heberling Posted January 15, 2020 Share Posted January 15, 2020 volvo and mack trucks DRIVE SHAFT OUT OF PHASE!!!! AND DON'T STAND BEHIND THEM Quote Link to comment https://www.bigmacktrucks.com/topic/23476-driveline-phasing-or-timing/#findComment-440397 Share on other sites More sharing options...
m16ty Posted January 19, 2020 Share Posted January 19, 2020 Just line the yokes up. Quote Link to comment https://www.bigmacktrucks.com/topic/23476-driveline-phasing-or-timing/#findComment-440850 Share on other sites More sharing options...
David Heberling Posted February 26, 2020 Share Posted February 26, 2020 my truck came from volvo this way . i no a guy one year old mack same problem . i no a guy one year old volvo same problem Quote Link to comment https://www.bigmacktrucks.com/topic/23476-driveline-phasing-or-timing/#findComment-443764 Share on other sites More sharing options...
BGarofalo Posted February 26, 2020 Share Posted February 26, 2020 For a few years now new trucks can come from the factory with yokes that are not lined up (out of phase). This is normal and engineered with regard to which suspension is on the truck to cancel our vibrations. It’s mostly on the shaft between drives. It is even more important now to mark the shafts when servicing. Quote Link to comment https://www.bigmacktrucks.com/topic/23476-driveline-phasing-or-timing/#findComment-443817 Share on other sites More sharing options...
David Heberling Posted February 27, 2020 Share Posted February 27, 2020 you don't know what your talking about BGarofalo .when drive shaft is out of phase it makes it jerk two time every turn. my new truck the drive tires only lasted 36000 miles because of this. and has tor up my hole drive line. volvo and mack needs to recall this junk. Quote Link to comment https://www.bigmacktrucks.com/topic/23476-driveline-phasing-or-timing/#findComment-443842 Share on other sites More sharing options...
David Heberling Posted February 27, 2020 Share Posted February 27, 2020 Torsional vibrations are SERIOUS vibrations Why? Because when you vary the speed of a drive shaft, you not only vary the torque on all of its components, but you vary the torque on all of the components that are connected to the drive shaft Torque is LOAD. When you vary the load, at twice per revolution, you start to bend components. You know what happens then……the same thing that happens when you bend a can lid back and forth. IT BREAKS. Quote Link to comment https://www.bigmacktrucks.com/topic/23476-driveline-phasing-or-timing/#findComment-443844 Share on other sites More sharing options...
Phase 1 Posted February 27, 2020 Share Posted February 27, 2020 40 minutes ago, David Heberling said: you don't know what your talking about BGarofalo .when drive shaft is out of phase it makes it jerk two time every turn. my new truck the drive tires only lasted 36000 miles because of this. and has tor up my hole drive line. volvo and mack needs to recall this junk. Torsional vibrations occur twice every time the driveshaft rotates. These result from excessive angles in the u-joints. They also can be caused by driveshafts that have been reassembled out of phase. A phased driveshaft generally is one in which the yokes are in line. However, it is not uncommon for chassis manufacturers to order driveshafts with special phasing. "Torsional vibrations are one of the biggest installation problems you will encounter," Koedam said. Koedam suggested that shops mark driveline components before disassembling them. Mark them in a way that makes it clear that the driveline is being reassembled the same way the manufacturer built it. One good way to identify specially phased drivelines is to look at the weld seam on the tubing. If the weld seam is straight but the yoke is turned, the driveline probably has been built out of phase. https://www.trailer-bodybuilders.com/distributors-upfitters/article/21739166/what-every-shop-must-know-about-drivelines Quote Link to comment https://www.bigmacktrucks.com/topic/23476-driveline-phasing-or-timing/#findComment-443846 Share on other sites More sharing options...
mrsmackpaul Posted February 27, 2020 Share Posted February 27, 2020 As far as I know phasing of drive shafts is only needed when more than one drive shaft is used Each shaft generally is not lined up, the yokes on each shaft must be lined up but the yokes shouldnt be lined up between shafts As in the yokes should be not in a straight line down a drive shaft Usually starting from the gear box end each is set one spline tooth lagging the shaft in front However this not always needed . Unsure why and or whats differrent but I think it may have to do if the shafts are balanced as a whole or separately I doubt there is many places that can balance a combination shaft 25 feet long I also think the phasing may have to do with one shaft interfering or affecting the other I do not know this and only am guessing Paul Quote Link to comment https://www.bigmacktrucks.com/topic/23476-driveline-phasing-or-timing/#findComment-443851 Share on other sites More sharing options...
j hancock Posted February 27, 2020 Share Posted February 27, 2020 Some info from Dana https://media.spicerparts.com/cfs/files/media/sHto4RMKzg7cmgEQQ/JOI-TEC-082 Interaxle Driveline Phasing.pdf?token=eyJhdXRoVG9rZW4iOiIifQ%3D%3D&store=original 1 Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/23476-driveline-phasing-or-timing/#findComment-443874 Share on other sites More sharing options...
Lmackattack Posted February 27, 2020 Share Posted February 27, 2020 Quote Link to comment https://www.bigmacktrucks.com/topic/23476-driveline-phasing-or-timing/#findComment-443884 Share on other sites More sharing options...
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