Is my Eaton Fuller transmission destroyed now?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Johndeere330, Nov 30, 2021.

  1. Johndeere330

    Johndeere330 Bobtail Member

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    Nov 30, 2021
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    Okay so I have a fuller 9 speed on my dump truck, and I changed the output shaft seal on the back of the trans. When I took off the pinion nut (the truck sat for weeks and had no air was busy) the yoke spun freely in te trans even when in gear. My buddy told me just air it up shift it into low and high and you'll be good. So I did and it worked. But now another friend of mine told me I spun the gears out of alignment with the main shaft and it needs to come completely apart to re-time the gears? Does anyone know if this is true? I took it for a short drive and everything worked really smooth.
     
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  3. AModelCat

    AModelCat Road Train Member

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    Its fine. Only way the timing will be affected is if you removed the back box.
     
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  4. SmallPackage

    SmallPackage Road Train Member

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    You did ok. Default neutral is normal when a trans looses air. Most people don’t know this because it is always connected to something on the tail end that will not move until air pressure rises.
     
  5. SmallPackage

    SmallPackage Road Train Member

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    This is also one reason to cycle the buttons thru the ranges while stick is in neutral after startup before the first trip out. This ensures that everything works and the trans goes in to the gear you want it to.
     
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  6. Johndeere330

    Johndeere330 Bobtail Member

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    Okay well I should also note when I took the seal cover off the bearing fell out because the truck was parked slightly downhill in my yard and it slid out when I barley tapped the shaft with the cover my accident. It fell in sand and dirt so I just put a new one in which I know is NOT the right thing to do because it should be changed with the race. I literally put 3-5k miles a year on it we do very local work and it's mostly used on site jobs so am I okay or will that new bearing screw things up?
     
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  7. BoxCarKidd

    BoxCarKidd Road Train Member

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    All it needs is more road!
     
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  8. AModelCat

    AModelCat Road Train Member

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  9. Don379

    Don379 Medium Load Member

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    omg the misinformation from someone else. Eaton trans is not rocket science and takes alot to destroy one
     
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  10. Johndeere330

    Johndeere330 Bobtail Member

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    Nov 30, 2021
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    Yeah I never worked on a fuller trans mainly just heavy equipment but one guy told me using an old race (which was still smooth but I know doesnt match 100%) will chew up a new cone bearing and that because the output shaft got moved around a little it's out of time. I got a little worried because I just put all new tires and other work into it, it suck that I ruined it but sounds like I'm okay
     
    Don379 Thanks this.
  11. MAMservices

    MAMservices Bobtail Member

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    I think your Buddy may be having a laugh at your expense. Give him a wet Willy next time ya see him.
     
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