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01-27-2024, 12:46 AM | #1 |
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Join Date: Jul 2022
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Is this U-Joint play normal
I am preparing to install a Mitchell overdrive and synchro transmission. Upon removing the torque tube I found that the U-joint has 3/32" of play in and out is this normal? I would think this would cause a lot of vibration but none was felt. I am new to "A"s and this joint is unlike any I am familiar with.
Any guidance is appreciated. |
01-27-2024, 07:08 AM | #2 |
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Is this U-Joint play normal
I’m not sure I understand. The universal joint is bolted to the output shaft of the transmission. I wouldn’t think there would be any in and out movement from wear. A worn universal joint will have lateral (twisty back and forth) movement. 3/32” sounds like a lot to me.
Considering how much trouble it is to replace the universal joint, I think I would replace it if there is that much play in it. (Be super careful with that rear spring. It can really hurt you if it breaks free.) Last year, when I needed to replace my universal joint, I could not find one. I eventually bought a new one from Gary Nelson. [email protected] He is a nice guy, and he has speedy delivery. New universal joints may be a slightly newer design that may “kiss” the housing slightly in use but work fine. An original, used universal joint in good shape will not “kiss” the housing, but they are harder to find. Sent from my iPhone using Tapatalk |
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01-27-2024, 07:23 AM | #3 |
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Re: Is this U-Joint play normal
This may be off subject; but when you have the diff out is a good time to replace the spring shackles.
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01-27-2024, 08:24 AM | #4 |
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Re: Is this U-Joint play normal
This slide might help you.
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Bob Bidonde |
01-27-2024, 08:48 AM | #5 |
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Re: Is this U-Joint play normal
If it is the riveted design as pictured above. Replace it. The "cross" in the new should slide left and right-up and down, but NO rotational play. None. Hold both ends in your hand. If it will rotate - even a tiny bit- It is prudent to replacet it while the rear end is out.
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01-27-2024, 11:46 AM | #6 |
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Re: Is this U-Joint play normal
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01-27-2024, 11:48 AM | #7 |
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Re: Is this U-Joint play normal
Sound like you are describing "radial" play of the joint. That is normal. "Axial" play is not what you want.
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01-27-2024, 01:12 PM | #8 |
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Re: Is this U-Joint play normal
I rebuilt my u-joint a couple years ago, it had the side to side play, after the rebuilding no play ! I don’t remember needles, I’ve slept too many nights, but I think the cups is where the wearing occurred
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01-27-2024, 07:26 PM | #9 |
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Re: Is this U-Joint play normal
In a Spicer style universal joint, it is possible to move what I will call the cross piece back and forth in the needle rollers along the direction the rollers lay in there. in other words, along the line of one of the arms of the cross piece and at right angles to the drive shaft.
I hope I have explained that well enough. If you had no vibration before, I wouldn't over think this, just put it back together, grease it and drive on.
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I'm part of the only ever generation with an analogue childhood and a digital adulthood. Last edited by Synchro909; 01-28-2024 at 06:31 PM. |
01-28-2024, 03:28 AM | #10 |
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Re: Is this U-Joint play normal
That side to side play is normal.
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01-28-2024, 03:47 AM | #11 |
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Re: Is this U-Joint play normal
https://www.youtube.com/watch?v=A_g7PEnqAbs
Like this? I think it would have to as both input shafts are held firm by bearings unlike an open drive line. |
01-28-2024, 11:19 AM | #12 |
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Re: Is this U-Joint play normal
Riveted types were generally replaced with the B-7090 non-riveted types used up though 1948. The B-7090 is a bushing type U-joint. It replaced the earlier A-7090 for spare part replacement. The Lincoln U-joints had needle bearings and can be substituted for the bushing type joint. They may not last as long though. It just depends on where any reproductions may have been manufactured. Some had an inner yoke where the splined portion was too short. This allowed the spline portion to move on the shaft since the belleville washer wouldn't make contact when the U-joint was installed. Rebuild kits are available for the B-7090 bushing type U-joints.
Using John Deer Corn Head Grease in the U-joint housing will keep them lasting longer with minimal leakage. As was mentioned previously, some of the later B-7090 reproductions have a little too much meat on them and can rub on the housing without modification. This is where it helps to know exactly what to look for. A rebuildable original B-7090 joint is good to go since all the parts that wear the most are in the rebuild kits. Last edited by rotorwrench; 01-28-2024 at 12:36 PM. |
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