Need to tighten up bolt on rear yoke on front diff

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Cam Roberts, Jul 8, 2018.

  1. Cam Roberts

    Cam Roberts Road Train Member

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    the seal is not bad. It’s not leaking oil around seal. I just started getting a tiny bit of oil slinging out from the thread area. Called my mechanic and he told me that’s what happens when that bolt gets a little loose. The yoke did develop slight movement. He wants me to bring up to his shop after work one day this week which is 45 minutes away to tighten the bolt. I already bought a 2 1/8 socket and gonna do this by myself to save time. I have a 3/4 ratchet and a 6 foot breaker bar. My question is, how do I remove the u joint off the yoke. The u joint is pretty new. Looks like I can just undo those 2 straps on either side. Is it as simple as that and the drive shaft drops down? What’s the torque specs on those bolts when I remount it? Just want to be prepared so let me know if anything to look out for and any pointers. Circled in red the straps I’m talking about. Again, this is the yoke on the back of the front diff going toward the rear diff. The short drive shaft.
    FFB2069C-DF22-4EE6-AFC6-DE1954D201F1.jpeg
     
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  3. boneebone

    boneebone Road Train Member

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    Heavyd and AModelCat Thank this.
  4. Goodysnap

    Goodysnap Road Train Member

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    Those straps are one time use. Order a new strap kit with bolts. The torque spec is stamped on the new strap kit. 125 ft lbs from memory on that series. Cheap insurance that nothing comes loose.
     
    BUMBACLADWAR and AModelCat Thank this.
  5. Cam Roberts

    Cam Roberts Road Train Member

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    easy as that? thank you sir. Can you point me in the right direction for strap kit? so I an order one on the computer tonight? its 02 petebilt 379
     
  6. A5¢

    A5¢ Medium Load Member

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    Goodysnap. What would be the torque spec for the yoke nut?
     
  7. Goodysnap

    Goodysnap Road Train Member

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    Should be 1710 series ujoint.part # 6.5-70-18x
     
  8. Cam Roberts

    Cam Roberts Road Train Member

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    Thank you sir. I’ll call peterbilt in the morning and get the part number for the joint kit. I don’t think they will have the strap kit so when I get the unjoint part number I will reply back to you
     
    Goodysnap Thanks this.
  9. Cam Roberts

    Cam Roberts Road Train Member

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    I’m curious as well but I thinks somewhere around 600 ft pounds or more. I was just gonna crank down on the bolt with my 6 ft breaker until the yoke was snug and tight
     
  10. Goodysnap

    Goodysnap Road Train Member

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    Any Pete dealer should have the strap kit available separate. Driveshafts are pulled for tow ins all the time.

    Dana DS-DSP40 yoke nut torque is 900+- 100ft lbs. To be completely fair it is near impossible to achieve this torque with a torque wrench and torque multipliers are very cumbersome given the location. Industry standard would typically be run it down tight with a healthy 3/4 impact. New yoke nuts are a good idea too. Or red loctite the very least.

    I usually apply a small amount of rtv sealer to the splines when I have a yoke off as oil migration out the splines is not uncommon.
     
    Last edited: Jul 8, 2018
  11. Cam Roberts

    Cam Roberts Road Train Member

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    ####!! that's a lot of torque. So I guess ill have to hang my 230 pound body on the 6 ft bar huh. its actually one of those 6ft aluminum fence posts
     
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