What's causing my engine to "freewheel?"

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Russian Rabbit, Feb 12, 2019.

  1. Russian Rabbit

    Russian Rabbit Road Train Member

    1,097
    900
    Jan 3, 2016
    0
    What is causing my engine to sometimes rev really high, sort of "freewheel," yet the transmission never came out of gear? If i let off the accelerator for a sec, let the revs come down, then it "re-engages" properly.

    It's a cummins. Not sure which one, but can check tonight. Regular roadranger 10spd manual. NOTE: This is NOT a super 10. Just a regular 10spd manual.

    Volvo, if that matters.
     
  2. Cat sdp

    Cat sdp . .

    8,623
    14,402
    Apr 8, 2012
    Orion's Belt
    0
    Any free play in the top of the clutch pedal.....?
     
  3. tarmadilo

    tarmadilo Bobtail Member

    49
    71
    Dec 12, 2018
    0
  4. Brandt

    Brandt Road Train Member

    1,986
    1,726
    Sep 17, 2012
    0
    Sounds like it's time for a new clutch or it might need adjusting.
     
  5. Russian Rabbit

    Russian Rabbit Road Train Member

    1,097
    900
    Jan 3, 2016
    0
    i never thought about this as i rarely use the clutch. As far as i remember, there is no free play. Now, with volvos, and i'm not sure if all trucks have this, but volvos have like a hydraulic resevoir for the clutch and i'm not exactly sure how that works and really only found out about it a few days ago when another driver pointed it out to me.
     
  6. Russian Rabbit

    Russian Rabbit Road Train Member

    1,097
    900
    Jan 3, 2016
    0
    i'll make a note of this for the mechanic. Yes, i'm not an O/O.
     
  7. little cat 500

    little cat 500 Road Train Member

    1,363
    442
    Jan 17, 2010
    Abbottstown PA
    0
    I have a 13spd that does this from time to time only in high gear like it jumps out of gear but shifter is still in hole been doing this for few years
     
  • Draft saved Draft deleted