Leonardob Posted October 22, 2024 Share Posted October 22, 2024 Hello, good morning. I have a Mack gu713 2012 My gearbox was leaking oil and I sent it to be repaired. Take advantage of the time and my truck mechanic the u-joints of the steering shaft. When I reinstall the gear box, and the steering shaft I notice the steering wheel direction harder than normal. I assumed that the gear box didn't look good. I down the gear box again, I send it to check and they tell me that everything is fine with it.. Doing and asking someone tell me that the problem may be that my mechanic did not replace the u-joints as the previous ones were. And the truth is that I would like opinions. (I already changed the steering pump) (I also took the air out of the pump with the tires in the air) if you help me I send you a tip . I need my truck back 😭🙌🏻🙏🏻 Quote Link to comment https://www.bigmacktrucks.com/topic/74666-help-with-my-steering-shaft/ Share on other sites More sharing options...
MACKS Posted October 22, 2024 Share Posted October 22, 2024 The u joints must be phased properly,someone will chime in and explain it I’m sure.. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74666-help-with-my-steering-shaft/#findComment-560515 Share on other sites More sharing options...
MACKS Posted October 22, 2024 Share Posted October 22, 2024 Or just look at another similar truck.. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74666-help-with-my-steering-shaft/#findComment-560516 Share on other sites More sharing options...
Popular Post terry Posted October 22, 2024 Popular Post Share Posted October 22, 2024 Definitely has to be timed right, i put u joints in a steering shaft on a DM, it would almost bind up till i changed the timing on them. Terry 2 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74666-help-with-my-steering-shaft/#findComment-560524 Share on other sites More sharing options...
cruiseliner64 Posted October 22, 2024 Share Posted October 22, 2024 9 hours ago, terry said: Definitely has to be timed right, i put u joints in a steering shaft on a DM, it would almost bind up till i changed the timing on them. Terry Ok guys,im working on vehicles a long time but never heard of timing a steering shaft.could anyone please explain? Im always keen to learn something new.its possible i know it as something else but would love to know.thanks Paul. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74666-help-with-my-steering-shaft/#findComment-560567 Share on other sites More sharing options...
topo Posted October 22, 2024 Share Posted October 22, 2024 I once replaced the u joints on a DM and lined up the U joints like I would on a drive line and it was not right then the slip joint out and turned it a quarter turn and it was right . 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74666-help-with-my-steering-shaft/#findComment-560575 Share on other sites More sharing options...
mowerman Posted October 23, 2024 Share Posted October 23, 2024 heh,,,i never heard of that either,,,but ive never changed the steering shaft U joints on anything,,,makes sense,, ,bob 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74666-help-with-my-steering-shaft/#findComment-560641 Share on other sites More sharing options...
Leonardob Posted December 23, 2024 Author Share Posted December 23, 2024 up, i still with the problem Quote Link to comment https://www.bigmacktrucks.com/topic/74666-help-with-my-steering-shaft/#findComment-564557 Share on other sites More sharing options...
Joey Mack Posted December 23, 2024 Share Posted December 23, 2024 "phasing" the steering shaft would be correct, however, if there are 2 u joints at the steering box, you dont phase them. They need to be offset, but i dont know by how much. It's not 90 degrees. Does it have that set up? Quote Link to comment https://www.bigmacktrucks.com/topic/74666-help-with-my-steering-shaft/#findComment-564569 Share on other sites More sharing options...
Joseph Cummings Posted December 23, 2024 Share Posted December 23, 2024 (edited) I don't think the angle of the shaft on the steering box and at the bottom of the column are are even the same, so in phase or out of phase shouldn't make a difference. When you phase a drive shaft it's only so one u joint cancels out the speed variations caused by the other. It causes a vibration problem, not a binding problem. Nobody is turning a steering wheel fast enough for that Edited December 23, 2024 by Joseph Cummings Quote Link to comment https://www.bigmacktrucks.com/topic/74666-help-with-my-steering-shaft/#findComment-564571 Share on other sites More sharing options...
Joey Mack Posted December 23, 2024 Share Posted December 23, 2024 (edited) The ujoints will bind on the steering shaft if they are in line, then mounted in the angled bracket. Like on RD Macks for example. I cant remember if his Volvo has that set up.. I should have been more specific. I meant the 2 u joints and steering bearing shaft that is mounted on top of the sheppard steering box.. Sorry, JC.... Edited December 24, 2024 by Joey Mack More content needed 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74666-help-with-my-steering-shaft/#findComment-564572 Share on other sites More sharing options...
Joseph Cummings Posted December 24, 2024 Share Posted December 24, 2024 7 hours ago, Joey Mack said: The ujoints will bind on the steering shaft if they are in line, then mounted in the angled bracket. Like on RD Macks for example. I cant remember if his Volvo has that set up.. I should have been more specific. I meant the 2 u joints and steering bearing shaft that is mounted on top of the sheppard steering box.. Sorry, JC.... If something is binding it should be pretty obvious. It's got to be yoke hitting yoke. I've never had that problem and I've done a lot. I've even had to make a few of my own steering shafts for obsolete equipment and conversions and had no problem. But if something is binding it should be easy to see. He could just turn it if it makes it not bind. If the angles are all strange it's not like it's going to lead to a problem like as if it were a power transmission shaft. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74666-help-with-my-steering-shaft/#findComment-564598 Share on other sites More sharing options...
Joseph Cummings Posted December 24, 2024 Share Posted December 24, 2024 Here is a used one. If it's right they are 90 degrees out of phase. I've got to think about this. Maybe I'm having a senior moment, but I don't ever remember having to put much thought into designing a steering shaft. Maybe I just got lucky 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74666-help-with-my-steering-shaft/#findComment-564599 Share on other sites More sharing options...
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