Forums Modeling Motive Power
  • Topic: USAT 3-axle rattle

    Back To Topics
    (0 rates)
    • September 24, 2019 11:03 PM EDT
      • Kittery, ME
         
      • Posts
        668
      • Thanks
        43
      • Thanked
        259

      And yes, the bushings look the same. The axle ones are at 45° and the ones for the idlers are at 0°. 

    • September 24, 2019 11:08 PM EDT
      • Floe Ice, Antarctica
         
      • Posts
        3,338
      • Thanks
        0
      • Thanked
        61

      I have rebuilt a whole bunch of USA 6 wheel power trucks.

      While usually it's a popped apart slip shaft, as you found out, not always.

      You replaced the axle gear in the pivot ends?

      There was something....the way the driveshaft connected....bushing worn.....I can't remember....keep having visions of Botch Shays in pieces, Botch plugs and wiring falling apart.

      You can pull the bottom big cover, both those axles, hold the articulated end firm and apply power and watch.

      My guess is the front u-joint is hitting a housing part or screw.....but that's a guess, as I don't have one here.

       

      I Might be able to dig up a PA, but not tonight.

       

      If the bottom or top cover of the articulated axle isn't seated or fitted correctly, it can hit the u-joint.

       

      TOC

    • September 25, 2019 12:03 PM EDT
      • Kittery, ME
         
      • Posts
        668
      • Thanks
        43
      • Thanked
        259

      Thanks for all the input.  At least I know that it's not common.  Since it's affecting both of my trucks, it must be something unique to my rebuild.  I will investigate further.

       

      Eric

       

    • September 25, 2019 12:14 PM EDT
      • Be Nice or STFU
         
      • Posts
        9,251
      • Thanks
        241
      • Thanked
        835

      I'm thinking that a quick test would be to swap the 2 axles from your B unit into one of the noisy ones.

       

      I assume all that you changed was the 2 axles, not the intermediate gears or the floppy one.

       

      Greg

       

      p.s. dumb question, did you count the teeth on the old gears and the new gears?

      ____________________________________

      Be sure­ to visit ­my site, l­ots of tec­hnical tip­s and modi­fications,­ and you c­an search ­for topics­ and key w­ords.


      ­Click HERE for Greg­'s web sit­e
      PLEASE NOT­E: Please do NOT use private messaging, i­f you have­ a questio­n, feel fr­ee to emai­l me priva­tely, u­se regular­ email onl­y: greg@el­massian.co­m

    • September 25, 2019 12:25 PM EDT
      • Kittery, ME
         
      • Posts
        668
      • Thanks
        43
      • Thanked
        259

      I changed all three axles, but not the intermediate gears.

    • September 25, 2019 1:17 PM EDT
      • Be Nice or STFU
         
      • Posts
        9,251
      • Thanks
        241
      • Thanked
        835

      Ahh!

       

      Were the axles in the floppy units "cracked" also?

       

      Based on your videos, I strongly suspect something amiss in the universal drive, add that to what TOC said about it coming apart, sure seems the most likely.

       

      I've never disassembled that part, other than removing the axles very carefully and re-gauging.

       

      Greg

      ____________________________________

      Be sure­ to visit ­my site, l­ots of tec­hnical tip­s and modi­fications,­ and you c­an search ­for topics­ and key w­ords.


      ­Click HERE for Greg­'s web sit­e
      PLEASE NOT­E: Please do NOT use private messaging, i­f you have­ a questio­n, feel fr­ee to emai­l me priva­tely, u­se regular­ email onl­y: greg@el­massian.co­m

    • September 25, 2019 1:24 PM EDT
      • Kittery, ME
         
      • Posts
        668
      • Thanks
        43
      • Thanked
        259

      No cracks.  I just replaced them all for good measure. I don't think I touched the drive shaft in the process, but I'll tear it down again.

    • September 25, 2019 8:46 PM EDT
      • Be Nice or STFU
         
      • Posts
        9,251
      • Thanks
        241
      • Thanked
        835

      It seems it's pretty buried down there, can you take some pictures when you get down inside it?

       

      Thanks, Greg

      ____________________________________

      Be sure­ to visit ­my site, l­ots of tec­hnical tip­s and modi­fications,­ and you c­an search ­for topics­ and key w­ords.


      ­Click HERE for Greg­'s web sit­e
      PLEASE NOT­E: Please do NOT use private messaging, i­f you have­ a questio­n, feel fr­ee to emai­l me priva­tely, u­se regular­ email onl­y: greg@el­massian.co­m

    • September 26, 2019 7:01 PM EDT
      • Rooster Works "Area 69" ,
         
      • Posts
        14,308
      • Thanks
        2,308
      • Thanked
        1,392

       

      If you listen to the noise on the trailing powered box car that I purchased used you will slightly hear what sounded like a death rattle which turned out to be.

       

       

       

      A crappy picture of the the culprit.  One tooth missing from the drive gear on the pilot axle. 

       

      Only my limited "personal"  experience.

       

       

      This post was edited by Rooster ' at September 26, 2019 7:12 PM EDT
    • September 26, 2019 7:30 PM EDT
      • Rooster Works "Area 69" ,
         
      • Posts
        14,308
      • Thanks
        2,308
      • Thanked
        1,392

      Please post your resolution Eric

       

      Thanks,

       Rooz

    • September 27, 2019 7:54 AM EDT
      • Kittery, ME
         
      • Posts
        668
      • Thanks
        43
      • Thanked
        259

      I  will post the resolution.  I don't think it's a missing gear tooth, as the gears are brand new, and made of delrin.

       

      I'm really focused on my layout at the moment, as it's starting to get colder here.  I probably won't dig into this for a few weeks.

    • September 27, 2019 12:51 PM EDT
      • Be Nice or STFU
         
      • Posts
        9,251
      • Thanks
        241
      • Thanked
        835

      It is though, along the line I was going with my request to swap back the originals one by one.

       

      Clearly a missing tooth will give you the noise. (thank you Rooster)

       

      Perhaps the custom gears are not quite the same dimensions, or have some variation in tooth spacing.

       

      Greg

       

       

      ____________________________________

      Be sure­ to visit ­my site, l­ots of tec­hnical tip­s and modi­fications,­ and you c­an search ­for topics­ and key w­ords.


      ­Click HERE for Greg­'s web sit­e
      PLEASE NOT­E: Please do NOT use private messaging, i­f you have­ a questio­n, feel fr­ee to emai­l me priva­tely, u­se regular­ email onl­y: greg@el­massian.co­m

    • September 29, 2019 10:47 PM EDT
      • Cleveland, , Mississippi
         
      • Posts
        386
      • Thanks
        0
      • Thanked
        20

      How often does the gears need to be lubricated. My locos do not run very often, I spend most of the time building. 

    • September 29, 2019 11:27 PM EDT
      • Be Nice or STFU
         
      • Posts
        9,251
      • Thanks
        241
      • Thanked
        835

      Ron, once you have sufficient grease inside, pretty close to never, I've never seen one without lubrication there.

      BUT

      You need to lube the axles, there are plain bronze bearings, I prefer heavy gear oil.

       

      You need to lube the journals where the axle tips ride, because that is where all the weight of the loco rests, and they get dirty and gritty. I recommend a good moly grease, and you need to replace when they start to wear oblong.

       

      I do have what might be helpful information on my site: https://elmassian.com/index.php/large-scale-train-main-page/motive-power-mods-aamp-tips/usat-motive-power/diesel-motor-block-tips

       

       

      Greg

      ____________________________________

      Be sure­ to visit ­my site, l­ots of tec­hnical tip­s and modi­fications,­ and you c­an search ­for topics­ and key w­ords.


      ­Click HERE for Greg­'s web sit­e
      PLEASE NOT­E: Please do NOT use private messaging, i­f you have­ a questio­n, feel fr­ee to emai­l me priva­tely, u­se regular­ email onl­y: greg@el­massian.co­m

    • September 29, 2019 11:37 PM EDT
      • Port Orchard, Washington
         
      • Posts
        2,372
      • Thanks
        95
      • Thanked
        301

      Greg,

      I'm experimenting with using ball bearings on my USAT sideframes. I'm battery powered, so I don't need to use the conductive sideframes. I'm hoping that these ball bearings will work better.

    • October 11, 2019 11:10 AM EDT
      • Be Nice or STFU
         
      • Posts
        9,251
      • Thanks
        241
      • Thanked
        835

      Eric, and progress/resolution on your issue?

       

      Greg

      ____________________________________

      Be sure­ to visit ­my site, l­ots of tec­hnical tip­s and modi­fications,­ and you c­an search ­for topics­ and key w­ords.


      ­Click HERE for Greg­'s web sit­e
      PLEASE NOT­E: Please do NOT use private messaging, i­f you have­ a questio­n, feel fr­ee to emai­l me priva­tely, u­se regular­ email onl­y: greg@el­massian.co­m

    • October 11, 2019 2:02 PM EDT
      • Kittery, ME
         
      • Posts
        668
      • Thanks
        43
      • Thanked
        259

      No, this is on the back burner until it snows and I can't play outside.

    • October 11, 2019 2:25 PM EDT
      • Be Nice or STFU
         
      • Posts
        9,251
      • Thanks
        241
      • Thanked
        835

      Thanks Eric, really curious as to what the mystery is.

       

      Greg

      ____________________________________

      Be sure­ to visit ­my site, l­ots of tec­hnical tip­s and modi­fications,­ and you c­an search ­for topics­ and key w­ords.


      ­Click HERE for Greg­'s web sit­e
      PLEASE NOT­E: Please do NOT use private messaging, i­f you have­ a questio­n, feel fr­ee to emai­l me priva­tely, u­se regular­ email onl­y: greg@el­massian.co­m

Forums Modeling Motive Power

    Icon Legend

  • Topic has replies
    Hot topic
    Topic unread
    Topic doesn't have any replies
    Closed topic
    BBCode  is enabled
    HTML  is enabled

Add Reputation

Do you want to add reputation for this user by this post?

or cancel

Ads by Google