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Lars(wi) 
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Joined: 14 Sep 2009
Location: Permian Basin
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 Topic: 1 u-joint cup
Posted: 18 Apr 2023 at 10:48am |
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is ‘spinning’ on the yoke. Took the collars off, and the cup is not seized, turns freely, bolts were tight. What causes this, and what is the cure? Replace the u-joint?
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I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.
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DMiller
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Location: Hermann, Mo
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Posted: 18 Apr 2023 at 11:14am |
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Peen the Yoke bore and replace the joint.
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Lars(wi)
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Posted: 18 Apr 2023 at 11:15am |
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‘Peen’?
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I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.
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steve(ill)
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Joined: 11 Sep 2009
Location: illinois
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Posted: 18 Apr 2023 at 3:58pm |
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with the collar bolted on, the "HOLE" is a couple thousands bigger than the CAP , so the cap can rotate / move.... PEEN means to take a center punch and make several DIMPLES inside the "HOLE" so that the metal will extrude out a few thousands, and then COMPRESS when you reinstall the collar and bolt solid.... You can also make sure the collar has no burrs .. or take a couple thousands off the mating FACE around the bolt hole so you get more COMPRESSION on the cap when tightened.
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Like them all, but love the "B"s.
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Coke-in-MN
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Joined: 12 Sep 2009
Location: Afton MN
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Posted: 22 Apr 2023 at 12:42am |
Would depend what type of cap it is and what holds it in place , if it's full press in round hole in yoke it would depend on use as one could use a locktite compound to hold cap of not to worn - on a PTO shaft on one dump truck pump cap was lose and for a temp fix transmission shop didn't have the yoke in stock so they places 2 small tack welds onto cap to yoke surfaces - been running for 10 years now as a temp fix .
Notices you said bolts were used to secure the cap to the yoke - so if the STRAP type hold down then the strap is stretched and needs to be replaces . A new strap should solve the tension required - or you could shim under the strap . or on yoke side / or replace the yoke itself .
Edited by Coke-in-MN - 22 Apr 2023 at 12:47am
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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
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Ed (Ont)
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Posted: 22 Apr 2023 at 1:54pm |
Take the strap that holds it on. take a few thou off that that where the bolts go thru and put back in place. Torque to spec - it was 125 ft/lbs on my dump truck. And problem fixed. All the shops will tell you to put a new strap kit on but it will spin again in a few days. When you take a bit of material off the end of strap it tightens everything up a bit more. I just used a high speed air tool and those little cookies to take a bit off the strap.  Off the bottom of strap.
Edited by Ed (Ont) - 22 Apr 2023 at 8:09pm
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Ed (Ont)
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Posted: 22 Apr 2023 at 2:09pm |
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Ed (Ont)
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Posted: 22 Apr 2023 at 2:12pm |
Take a bit off the bottom. Few thou. Lets it tighten a bit more on the cap and keep it from spinning. If this is the design you are referring to. This is referred to as 1/2 round u-joint. If you shim under strap you will have no tension on cap. Will come apart real fast.
Edited by Ed (Ont) - 22 Apr 2023 at 2:25pm
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Ed (Ont)
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Posted: 22 Apr 2023 at 2:21pm |
Spicer 1810 
Edited by Ed (Ont) - 22 Apr 2023 at 2:22pm
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Lars(wi)
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Posted: 22 Apr 2023 at 2:36pm |
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Thanks Ed (Ont), that is exactly what I have.
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I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.
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DMiller
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Posted: 22 Apr 2023 at 2:39pm |
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Can also remove a few thou from the yoke ears, clamps then lose no stress value.
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Ed (Ont)
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Posted: 22 Apr 2023 at 3:09pm |
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Lars tighten straps to 125 ft/lbs. You can see it on the strap there. They show the range as 115-135. 12 pt 1/2 socket.
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Lars(wi)
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Posted: 22 Apr 2023 at 3:12pm |
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The one cup that spins is held with a strap.
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I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.
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Ed (Ont)
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Location: New Lowell, Ont
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Posted: 22 Apr 2023 at 4:53pm |
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Yes the ones that spin are always held with strap. Not the best design. Do as I have explained and you will not have any further problems. If you have spare time do all that are held with a strap the same way. Don't wait for them to start spinning.
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