U joint issue?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by cmrdev, Dec 8, 2017.

  1. spyder7723

    spyder7723 Road Train Member

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    Why would you replace the yoke cause the top of the cap broke off? They break off on a regular basis.
     
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  3. Oxbow

    Oxbow Road Train Member

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    I assume that he means the possibility of the cap breaking off could have been caused by the cup working in the yolk, and causing it to wear.
     
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  4. spyder7723

    spyder7723 Road Train Member

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    I suppose but corrosion also causes them to break off. Obviously you got to inspect the yoke anytime you pull a u joint but you don't just change yokes simply due to a cap breaking off.
     
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  5. Goodysnap

    Goodysnap Road Train Member

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    If the plate is broken from the cup when the bolts are removed the end yoke is toast. If the bearing cup falls out if the yoke the yoke is also toast. Installing a new u -joint in a worn end yoke is a waste of time as it will break again in short order. The plate breaking off the cup during removal is normal. Anytime a cap has spun or has movement in a yoke on a strap end, both pieces should be replaced. Just what I do......
     
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  6. spyder7723

    spyder7723 Road Train Member

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    I've seen a lot of plates broke off with the yoke in perfectly good condition. Changing parts simply because "its what i do" is why so many do not trust mechanics and are thought to be as honest as the typical broker.
     
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  7. Oxbow

    Oxbow Road Train Member

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    @cmrdev , check with the more knowledgeable than me, but I always anti-seize the cups before installing u-joints. I used to think that it might promote movement, but have not had any problems, and it makes a world of difference when it's time to take one out.
     
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  8. Goodysnap

    Goodysnap Road Train Member

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    Call it what you will. The plates break because the cup moves in the yoke, not from corrosion as you claim. You see me as a crook and that's Ok too. I'm simply saying to the OP to check the yokes closely for wear because you really cant tell from his video weather the movement is strictly in the u-joint. Jeesh... I'm out........
     
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  9. spyder7723

    spyder7723 Road Train Member

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    They say you shouldn't. But they also say you shouldn't never seize a wheel stud because it may cause it to come loose. And these are the same people that tell you the nuts are supposed to be torqued to 500 ft lbs then proceed to hammer on it till the 1200 ft lb air gun stops moving.
     
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  10. stayinback

    stayinback Road Train Member

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    Spyder- Are you like me and assume every Mechanic likes to Fire the Parts Cannon?
     
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  11. spyder7723

    spyder7723 Road Train Member

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    Next time you pull a ujoint, after the job is done, intentionally break the plate off the cap of the old one. You will see they are not attached very well. And there is a space all along the edge for salt and that liquid magnesium #### they spray on the roads to get between the cap and cup. 5+years of that stuff eating away at it and causing it to spread open. Its very much possible for corrosion to cause that plate to break free.

    I dont know you from adam so i don't know if you are a crook or an honest man. personally i lean towards inexperienced and putting to muck faith in those ase 'best practices' guidelines. You may have worked in a shop for 30 years and be a very good mechanic but there are certain things you won't pick up on unless you are working on the same truck over a period of years.

    And you know as well as i do that your industry is filled with both crooks and less than knowledgeable techs. Heck since i was a kid I've been hearing people say you never let a woman take a car to a mechanic or they will sell her stuff her car doesn't need.
     
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