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universal/cross joint

Discussion in 'XJ Technical Chat' started by truckerbikes, Dec 30, 2009.

  1. truckerbikes

    truckerbikes Member

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    84 xj750 is the ride. the problem is it has now destroyed 2(two) universal joints. i have another on hand but want to know has anyone come up with a solution to lubricting these mongrel things so as to stop this from happening again. one thought i had was to cross drill it and then tap a grease nipple into it. but after reading some other thoughts in here about that, forget that idea. my next thought is to drill a small hole into each end cap and pump them with htb grease then plug the holes with rubber grommets. youe thoughts and suggestions please people
     
    truckerbikes, Dec 30, 2009
    #1
  2. schooter

    schooter Active Member

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    how many miles on the bike? I've never heard of one failing.., and 2 of them, man
     
    schooter, Dec 30, 2009
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  3. schooter

    schooter Active Member

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    I looked at your gallery... and you have a 900 seca frame with a 750 engine.... maybe a little different
     
    schooter, Dec 30, 2009
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  4. TIMEtoRIDE

    TIMEtoRIDE Active Member

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    One thought is to check for a possible mis-alignment.
    The grease should be some kind of "moly" or top shelf synthetic.
    At worst, these "U" joints should be cheap, as they never fail.
     
    TIMEtoRIDE, Dec 30, 2009
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  5. RickCoMatic

    RickCoMatic Well-Known Member

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    Very unusual.
    Very, very unusual.

    I'd be looking for something loose causing the U-Joint to have unusual stresses placed upon it.
     
    RickCoMatic, Dec 30, 2009
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  6. truckerbikes

    truckerbikes Member

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    yeah i think the japs ran out of 900's for a while and had a heap of 750 engines laying around so started puting them into these frames and they worked. (just to keep production going)
     
    truckerbikes, Dec 30, 2009
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  7. truckerbikes

    truckerbikes Member

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    everything i have checked tells me it is all lined und running true. i get no vibration from the driveline at all, but after looking at this last uni joint it seems to me that lube is the problem or i should say serious lack of it
     
    truckerbikes, Dec 30, 2009
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  8. RickCoMatic

    RickCoMatic Well-Known Member

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    I guess you have no choice but to drill 'em ... Tap em and put-in a Grease fitting so you can push some grease in there.

    I wouldn't leave the Zerk Fittings in the Yokes, though.

    I'd close the drilled holes with Allen Headed Pipe Plugs.
    Well, ... Allen Headed Plugs ... (of some kind).
    The aluminum or titanium one the NOS Gas Boys use would be good.

    A little LockTite.
    Badda-Bing ... Badda-Boom!
     
    RickCoMatic, Dec 30, 2009
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  9. ol_750

    ol_750 Member

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    Hi Guys
    How did it go with the mods to the Uni joint ??
    My 84 XJ750Rl has done a joint too. A new one from the Frasers cost me $350.
    Seperate question for Trucker ...is your engine 45T?
    Cheers Andrew
     
    ol_750, Jan 3, 2010
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  10. truckerbikes

    truckerbikes Member

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    ol_750 yes the engine i am running at the moment is a 45T.. why do you have a problem
     
    truckerbikes, Jan 8, 2010
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