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Clutch slippage

Discussion in 'Trucks [ Eighteen Wheelers ]' started by double yellow, Feb 20, 2014.

  1. Feb 20, 2014 #1
    double yellow

    double yellow Road Train Member

    5,946
    10,066
    Aug 28, 2011
    State of Jefferson
    0
    How much is too much? 400,000 miles on original clutch, never adjusted, drives fine... But lately I've noticed the rpm reads ~15 higher under full load vs light load & ~25 higher under full load than under full engine braking. Example:

    flat ground: 1360
    incline: 1375
    decline: 1350

    Normal? Something a clutch adjustment would take care of?


    Thanks
     
    double yellow, Feb 20, 2014
    double yellow, Feb 20, 2014
    #1
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  3. Feb 21, 2014 #2
    Chewey

    Chewey Light Load Member

    140
    72
    Feb 10, 2012
    0
    If the clutch was slipping...you wouldn't be going no where. Particularly with carbon fiber clutches. This sounds like your engine( if new) is getting broken in or the humidity was just up that day.
     
    Chewey, Feb 21, 2014
    Chewey, Feb 21, 2014
    #2
  4. Feb 21, 2014 #3
    baha

    baha Road Train Member

    4,137
    2,837
    Jul 25, 2013
    ga
    0
    replace sensor at bell/houzing
     
    baha, Feb 21, 2014
    baha, Feb 21, 2014
    #3
  5. Feb 21, 2014 #4
    WitchingHour

    WitchingHour Road Train Member

    3,424
    2,144
    Apr 1, 2011
    Broomfield, CO
    0
    If your clutch was slipping, you'd know it. As stated above, it might be a sensor.
    Just out of curiosity, with no adjustment after 400k, where are you with free play on your clutch pedal?
     
    WitchingHour, Feb 21, 2014
    WitchingHour, Feb 21, 2014
    #4
  7. Feb 21, 2014 #5
    JohnP3

    JohnP3 Road Train Member

    1,594
    684
    Feb 21, 2010
    Rock Creek B.C. Canada
    0
    To test a clutch what I do is put it in#1 and with the maxi's on release the clutch it should drive away, no throttle, if it does not move clutch is junk.
    Get the clutch adjustment checked if you do not know how to do it.
    Just a thought!
     
    JohnP3, Feb 21, 2014
    JohnP3, Feb 21, 2014
    #5
  8. Feb 21, 2014 #6
    double yellow

    double yellow Road Train Member

    5,946
    10,066
    Aug 28, 2011
    State of Jefferson
    0
    freeplay is a bit more than an inch. Truck overpowers maxi's in low...

    What sensor are you talking about replacing? (I'm just comparing speed with rpm at various loads)
     
    double yellow, Feb 21, 2014
    double yellow, Feb 21, 2014
    #6
  9. Feb 21, 2014 #7
    e40water12

    e40water12 Bobtail Member

    41
    12
    Feb 16, 2014
    0
    simple clutch adjust would correct the issue. I would start with at first.
     
    e40water12, Feb 21, 2014
    e40water12, Feb 21, 2014
    #7
  10. Feb 21, 2014 #8
    magoo68

    magoo68 Road Train Member

    3,393
    5,385
    Jun 11, 2011
    st malo mb canada
    0
    most newer trucks have self adjusting clutches i have 1.3mill km about 800000 miles pulling 95000lbs plus still no slippage
     
    magoo68, Feb 21, 2014
    magoo68, Feb 21, 2014
    #8
    Cetane+ Thanks this.
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