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ts 14 g driveline issue

Discussion in 'Scrapers' started by gearhead74, Mar 20, 2020.

  1. gearhead74

    gearhead74 Member

    Mar 20, 2020
    hello we have three ts 14g scrapers three with 5.9 cummins what is happening is the front u joint or rear u joint ,drive shafts have broke ,yolks have broke ,splined shaft that goes into front of transmisson that bolts to the torque have broke ,it always seems to be when you first start them up they rattle like crazy has anyone ever come up with a fix for this problem any help would be appreciated thanks
  2. RZucker

    RZucker Senior Member

    Jul 7, 2013
    Wherever I end up
    Is your idle set too slow? No experience with those machines but have worked with others that would beat engine/trans drivelines to death if idled too slow.
  3. Questionable wizard

    Questionable wizard Well-Known Member

    Feb 10, 2018
    Ron Hoff posted about this several years ago. The Cummins 5.9 engines with the Bosch VP44 fuel injection pumps have what Ron called the doldroums, or a low a low frequency vibration according to Google. There is a speed up, and slow down every rotation of the engine crankshaft. This is the drive line rattle. This is most prevalent at slow engine idle. The driveline will destroy itself if ignored. Ron said this has been a problem for all the Cummins equipped TS14Gs. He set up the low idle to 900 rpm and it helped somewhat. It's not nearly as much trouble on the Detroit/Navistar engines.

    So to reduce your problems, once the engine is started(most ECMs don't like to see increased throttle at startup-safety measure for startup wear), make a shim to fit under the bottom end of the throttle pedal to keep the low rpm at 900-1000(get creative and make a flip around metal stop, only needed for the front engine).

    Also, if you can stick a screwdriver in the driveshaft and rotate it more than 1/4" with the engine off, you have too much wear in the driveline. The splines are worn and/or the torsional damper needs replaced. Also check the yoke going into the transmission torque converter. That yoke likes to wear the torque converter input shaft(those two parts come from John Deere).

    The torsional dampers were one part that Terex sorely missed on a needed redesign. If you get more than 3000 hours on one, it's shot and needs replaced.

    I've found an economical source for OEM dampers. Private message me(which I don't check as often as I should), or call nine3seven-five7zero-2sixtwonine. I'm in SW Ohio. Jon's phone 5-27-19 002 (Medium).jpg The top damper is the worn one. See the gap between the side of the spring coils and metal. The picture doesn't give justice to the wear on the metal at the end of each spring.
    Last edited: Mar 21, 2020
    RZucker likes this.