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Freightliner speedo issue

Discussion in 'Trucks [ Eighteen Wheelers ]' started by CbarM, Apr 23, 2013.

Page 1 of 2
  1. Apr 23, 2013 #1
    CbarM

    CbarM Heavy Load Member

    894
    247
    Jan 17, 2011
    Irvine, AB
    0
    Hey guys, I have a 98 cabover with the same dash as the FLD 120 n Classic. I was rumblin down the road bobtailingthis mornin at 60 mph n hit a 10 mile rough patch of road and I noticed my speedo had dropped to 25. I pulled over n unscrewed the panel to check the plug on the speedo but still readin 25 mph. Any ideas??
     
    CbarM, Apr 23, 2013
    CbarM, Apr 23, 2013
    #1
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  3. Apr 23, 2013 #2
    CatPowerC15

    CatPowerC15 Medium Load Member

    347
    91
    Feb 18, 2010
    Siler City, NC
    0
    Make sure the yoke nut on the trans is tight.
     
    CatPowerC15, Apr 23, 2013
    CatPowerC15, Apr 23, 2013
    #2
  4. Apr 23, 2013 #3
    CbarM

    CbarM Heavy Load Member

    894
    247
    Jan 17, 2011
    Irvine, AB
    0
    How would that affect the speedo reading?
     
    CbarM, Apr 23, 2013
    CbarM, Apr 23, 2013
    #3
  5. Apr 23, 2013 #4
    CbarM

    CbarM Heavy Load Member

    894
    247
    Jan 17, 2011
    Irvine, AB
    0
    Hmmm...weird! I pulled over again n gave what I thought was the sensor a wiggle (right at the front of the bell housing on the bottom) and it was pretty solid. Got rollin again n now it works normal again
     
    CbarM, Apr 23, 2013
    CbarM, Apr 23, 2013
    #4
  7. Apr 23, 2013 #5
    CatPowerC15

    CatPowerC15 Medium Load Member

    347
    91
    Feb 18, 2010
    Siler City, NC
    0
    Yoke nut loose lets rotor ring spin causes erratic movement.
     
    CatPowerC15, Apr 23, 2013
    CatPowerC15, Apr 23, 2013
    #5
  8. Apr 23, 2013 #6
    CatPowerC15

    CatPowerC15 Medium Load Member

    347
    91
    Feb 18, 2010
    Siler City, NC
    0
    You said speedo....do you mean tachometer instead? It reads the flywheel. Could be bad, or grease and metal debris on the tip.
     
    CatPowerC15, Apr 23, 2013
    CatPowerC15, Apr 23, 2013
    #6
  9. Apr 23, 2013 #7
    CbarM

    CbarM Heavy Load Member

    894
    247
    Jan 17, 2011
    Irvine, AB
    0
    Tach works good...but the speedo has now dropped back to 25 again. Still cruisin at 60. Its am Eaton 18 spd...where would the speedo sensor be?
     
    CbarM, Apr 23, 2013
    CbarM, Apr 23, 2013
    #7
  10. Apr 23, 2013 #8
    CatPowerC15

    CatPowerC15 Medium Load Member

    347
    91
    Feb 18, 2010
    Siler City, NC
    0
    On the back of the transmission. At the yoke. Depends on how old it is. The tip of the sensor could be internal or external. If external, check for trash and debris between tip and rotor. Make sure yoke nut it tight....push up and down on driveline. Should have no play. Take a long tip flat head and try to spin the rotor....must be tight.
     
    CatPowerC15, Apr 23, 2013
    CatPowerC15, Apr 23, 2013
    #8
  11. Apr 23, 2013 #9
    CbarM

    CbarM Heavy Load Member

    894
    247
    Jan 17, 2011
    Irvine, AB
    0
    Ok...I appreciate yer help!! Its been normal for the last couple hrs niw but when I stop again I will take a look. Last time I stopped I looked at the tranny yoke n it didnt look like it had moved but I will check it out more thoroughly. Thanks again!!
     
    CbarM, Apr 23, 2013
    CbarM, Apr 23, 2013
    #9
  12. Apr 24, 2013 #10
    FYDA FREIGHTLINER CINCY

    FYDA FREIGHTLINER CINCY Light Load Member

    270
    131
    Apr 28, 2009
    Cincinnati, ohio
    0
    On the old fld's you can also swap the speedo and tach heads. Hook the tach up to the speedo plug and speedo up to tach plug. So then when you are driving and tahc head drops you know the speedo head is good. But if the speedo head drops out when in the tach plug. You have a bad speedo head.
     
    FYDA FREIGHTLINER CINCY, Apr 24, 2013
    FYDA FREIGHTLINER CINCY, Apr 24, 2013
    #10
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