Downhill With A Dead Engine

Discussion in 'Trucking Accidents' started by mjd4277, Sep 25, 2024.

  1. jamespmack

    jamespmack Road Train Member

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    No. Some eaton auto shifts have a internal pump, some do not. Same as manuals.
     
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  3. Hammer166

    Hammer166 Crusty Information Officer

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    Right, but IIRC, the pumps are for pumping lube to the cooler and dropping oil on certain gearsets for better cooling under high torque loads, correct? A dead engine isn't going to be a high enough load for that to be a concern. It's not like an slush box with plain bearings that require pressure.
     
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  4. mjd4277

    mjd4277 Road Train Member

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    We’ll have to start looking at schematics of certain transmissions to be sure nowadays.
    Our Freightliner Cascadias all used the DT-12 automated manual transmissions,while our PACCAR trucks (KW T-680s and Peterbilt 579 Epiqs) use the Eaton Endurant 12 speed automated manuals. Either way if they’re towed the driveshafts are disconnected at the back of the transmission (bolts and the U-joints are removed) to prevent transmission damage.
     
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  5. SmallPackage

    SmallPackage Road Train Member

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    Disconnecting drivelines while towing has been a standard practice since the first road rangers came out. The lube gets moved by the input not the output. If it had a brownie it wouldnt be nessesary because with it in neutral the jack shaft between it and the main would not turn.

    If the engine was dead like they say in the report and not turning then most likely the input shaft on the trans was not turning fast enough to lube it for the speed it was going. With the rear turning at that high rate of speed it would be a miracle if the trans isn’t cooked.
     
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  6. jamespmack

    jamespmack Road Train Member

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    Not all trans with a cooler had a pump. If it had a pump it will pump while towed. Don't recommend long distance. But can be done safely. Input shaft normally needs to spin for oiling. But newer eatons have the "halo" oiling ring.

    If you don't know, and must tow with shaft in on a manual. You want a running engine. If you don't know 100%, you pull shaft. Or both right side axles.

    I'm not versed in the DT12. But a I-shift, I-Mack wants driveshaft removed, or all 4 axles removed, if you can't tow from the rear.
     
  7. AModelCat

    AModelCat Road Train Member

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    On Eatons the engine turns the input gear, which drives the countershafts. If the engine's off and the transmission is in neutral only the mainshaft turns but not the countershafts.
     
  8. Hammer166

    Hammer166 Crusty Information Officer

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    I was making the assumption he was smart enough to leave it in gear, but we all know what happens when one assumes!
     
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