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Speed sensor problem on Eaton Autoshift transmission

Discussion in 'Trucks [ Eighteen Wheelers ]' started by silver dollar, Apr 4, 2019.

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  1. Apr 4, 2019 #1
    silver dollar

    silver dollar Medium Load Member

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    Jan 31, 2009
    Central North Carolina
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    Greetings, I'm having problems with the speed sensor on the output shaft of my Eaton Autoshift transmission. The one that's there was forced threaded in the hole and wont stay tight, and the hole is not threaded. The replacement sensor i purchased is the non-threaded type, and seems to be to large for the hole.There are three possible sensor mounting locations on the shaft; 12 o'clock, 9 o'clock, and 6 o'clock. A tech at the Volvo shop told me to just use another hole, but I'm not sure how to remove the plugs or even if the space is availabe for a sensor. Can someone look at the pictures and tell me if you think it's possible, and how to removed the plugs? Thanks IMG_1006.JPG IMG_1007.JPG IMG_1008.JPG IMG_1009.JPG
     
    silver dollar, Apr 4, 2019
    silver dollar, Apr 4, 2019
    #1
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  3. Apr 4, 2019 #2
    BoxCarKidd

    BoxCarKidd Road Train Member

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    The hole where your existing sensor is should have a bolt next to it like the others. The correct sensor should push in the hole and just be held in by the correct bolt. No adjustment required.
     
    BoxCarKidd, Apr 4, 2019
    BoxCarKidd, Apr 4, 2019
    #2
    silver dollar Thanks this.
  4. Apr 4, 2019 #3
    silver dollar

    silver dollar Medium Load Member

    481
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    Jan 31, 2009
    Central North Carolina
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    Thanks. This is also what the tech said. But the push in type won't go in the hole. Should it take force to insert it?
     
    silver dollar, Apr 4, 2019
    silver dollar, Apr 4, 2019
    #3
  5. Apr 4, 2019 #4
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Make sure the hole is not buggered up and is clean. Use some oil on it and a little pressure.
     
    BoxCarKidd, Apr 4, 2019
    BoxCarKidd, Apr 4, 2019
    #4
    silver dollar Thanks this.
  7. Apr 4, 2019 #5
    silver dollar

    silver dollar Medium Load Member

    481
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    Jan 31, 2009
    Central North Carolina
    0
    That's what I was thinking, that the hole was "buggered" (lol). I want to use the hole a the 6 o'clock position to avoid any buggers that may be in the top hole from falling down in the tone ring area. Thanks again.
     
    silver dollar, Apr 4, 2019
    silver dollar, Apr 4, 2019
    #5
  8. Apr 5, 2019 #6
    Y-L

    Y-L Light Load Member

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    Oct 1, 2013
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    Change all of them and the 2 rail sensors while you are down there harness to.

    I changed the speed sensors and then had the rail sensor go out shortly after
     
    Y-L, Apr 5, 2019
    Y-L, Apr 5, 2019
    #6
    silver dollar Thanks this.
  9. Apr 5, 2019 #7
    Goodysnap

    Goodysnap Road Train Member

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    The holes in the tail housing get filled with rust. The sensors gets rust jacked and break as they are plastic. The new style Eaton sensor part number is recessed and has cutouts to prevent this. The gooves in the sensor leaves more of a gap between the sensor and the housing.

    Quit goofing around.......order a seal kit and a nut. Pull the housing off the truck. Break out the sensors and clean the bores out with a carbide burr bit and reassemble. The sensor comes with copper antisieze to coat the hole and new holdown bolts.

    The main shaft and input shaft speed sensors have the same issue and are in the shift bar housing. Those you can do from the top without pulling anything apart. Just have take the old sensors out in pieces.
     
    Goodysnap, Apr 5, 2019
    Goodysnap, Apr 5, 2019
    #7
    2013Maxx and silver dollar Thank this.
  10. Apr 7, 2019 #8
    silver dollar

    silver dollar Medium Load Member

    481
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    Jan 31, 2009
    Central North Carolina
    0
    Well, I was under the truck to day and following a tip from a driver, I discovered that the speed rotor, (tone ring) is not tight on the shaft. I can insert a screwdriver in the hole and move the ring on the shaft. Even though the sensor is not the correct one, its not the problem.
    Question: What keeps the ring tight on the shaft? And If I do this job myself, who would most likely stock the parts? ie: Fleet Pride, truck dealers, etc. Thanks again.
     
    silver dollar, Apr 7, 2019
    silver dollar, Apr 7, 2019
    #8
  11. Apr 8, 2019 #9
    Goodysnap

    Goodysnap Road Train Member

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    The yoke is loose. Pre- load from the yoke and bearings hold the tone ring tight. Get a seal kit and a yoke nut and the correct sensor and dont forget strap kits for the u-joints. You will need a big gun to get the yoke tight.

    You are correct with this being your issue for dropout. Quite common. Any truck dealers that have Eaton products in their trucks should stock these parts.
     
    Goodysnap, Apr 8, 2019
    Goodysnap, Apr 8, 2019
    #9
    silver dollar Thanks this.
  12. Apr 8, 2019 #10
    Heavyd

    Heavyd Road Train Member

    7,750
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    Feb 4, 2009
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    Is Eaton still putting a slight twist in the spines to lock the output on? It's been a while since I pulled on off, but none would come off without a puller and many had to be cut off with a torch.
     
    Heavyd, Apr 8, 2019
    Heavyd, Apr 8, 2019
    #10
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