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Grinding when selector valve is switched up

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Codynidaho, Mar 3, 2020.

  1. Mar 3, 2020 #1
    Codynidaho

    Codynidaho Light Load Member

    87
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    Apr 8, 2016
    Cheyenne, Wyoming
    0
    Hello,
    I'm not finding much about my issue. But from what I could find is that I may be to late and my synchros are bad. I'm getting grinding Everytime I move my selector switch from down to up. It doesn't do it going down. I ordered a rebuild kit for the air valve on the transmission but I have a feeling that's not the problem.

    I'm looking for some confirmation on worn out synchros. Help would be appreciated.
     
    Codynidaho, Mar 3, 2020
    Codynidaho, Mar 3, 2020
    #1
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  3. Mar 3, 2020 #2
    Codynidaho

    Codynidaho Light Load Member

    87
    20
    Apr 8, 2016
    Cheyenne, Wyoming
    0
    Also, I'm dealing with an Eaton 18speed.
     
    Codynidaho, Mar 3, 2020
    Codynidaho, Mar 3, 2020
    #2
  4. Mar 3, 2020 #3
    AModelCat

    AModelCat Road Train Member

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    Most likely worn out synchro. The synchro is a wearable part. If its worn out, it won't get the gear speeds synchronized in time before the dog teeth try to mesh, so they grind a bit.
     
    AModelCat, Mar 3, 2020
    AModelCat, Mar 3, 2020
    #3
    Bean Jr. and HopperHauler Thank this.
  5. Mar 3, 2020 #4
    HopperHauler

    HopperHauler Trucker Forum STAFF Staff Member

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    Jan 22, 2011
    North Dakota
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    My 13 did the same thing, it was the synchronizer. I pulled the rear unit off and took it to a transmission shop, he had a new synchro kit put in in about an hour and a half.
     
    HopperHauler, Mar 3, 2020
    HopperHauler, Mar 3, 2020
    #4
    Bean Jr. Thanks this.
  7. Mar 3, 2020 #5
    AModelCat

    AModelCat Road Train Member

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    Wouldn't be a bad time to re-seal the range and splitter pistons while you have the aux section out either. Could also consider a re-bearing of the aux countershafts and output shaft if they look questionable.
     
    AModelCat, Mar 3, 2020
    AModelCat, Mar 3, 2020
    #5
    HopperHauler Thanks this.
  8. Mar 3, 2020 #6
    bzinger

    bzinger Road Train Member

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    omaha , ne
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    My Eaton 10 speed started doing that occasionally going from hi to lo and quit doing it on it's own.
     
    bzinger, Mar 3, 2020
    bzinger, Mar 3, 2020
    #6
  9. Mar 3, 2020 #7
    Codynidaho

    Codynidaho Light Load Member

    87
    20
    Apr 8, 2016
    Cheyenne, Wyoming
    0
    Thanks for the input. I'll let the customer know. I'm a mobile service and I'm not about to tear into the trany in windy Wyoming. Lol
     
    Codynidaho, Mar 3, 2020
    Codynidaho, Mar 3, 2020
    #7
    Bean Jr. and bzinger Thank this.
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