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Bachmann GE 44 ton

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  • Glen_Haasdyk
    replied
    I got to repairing the engine today. I took each truck apart, washed the grease off with some Palmolive dish soap an re-assembled them.



    They went back together easily. Of course I re-gauged the trucks before re-assembly and re-lubed the gears with a small dollop of plastic-compatible grease.



    These are the two worm gears I got from Bachmann. I used one to replace the work that had the cracked cup and the removed the other cup to replace the cracked one on the motor. Upon re-assembly everything ran smoothly on my test track. Now it's back to installing a digitrax DZ-143 decoder and getting this project back to where it was three weeks ago.

    Leave a comment:


  • Glen_Haasdyk
    replied
    Thanks for sharing these repair techniques guys.

    In other news I got the replacement parts in the mail this past week. I'm just going to finish up another project and then I'll get back to this engine.

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  • john_holt
    replied
    Bernd...Thanks for the wrap-up info on the gear repair article. John

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  • Bernd
    replied
    quote:


    Originally posted by john holt


    I can't remember exactly where I read this. But someone had a cracked gear in a loco similar to what you described and repaired the crack using acc. The deal here is he washed the gears thoroughly to remove all grease and oil, applied slow setting acc glue and then took some very strong, fine wire and wrapped the round shoulder of the gear with several wraps and let it sit in a small vise until the glue was dry. The glue held the gear and wire wraps in place. Obviously, the wire wraps cannot exceed the gear diameter. The author of the story said this repair was still holding after a couple of years. I hope you can get a visual from my poorly written description. John


    John,

    Geoff Bunza wrote an article about battery powering one of these engines in Model Railroad Hobbyist magazine. For those that don't know the magazine is an E-zine started by Joe Fugate. Here's the link to the article. Geoff explains how he repaired a split gear using that method. Page 85 shows the gear fix.

    http://model-railroad-hobbyist.com/m...-models?page=1 Click on either portrait or landscape. It'll take you to that article or you can try this link directly to the article.

    http://mrhpub.com/2014-11-nov/land/#/83

    Bernd

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  • john_holt
    replied
    I can't remember exactly where I read this. But someone had a cracked gear in a loco similar to what you described and repaired the crack using acc. The deal here is he washed the gears thoroughly to remove all grease and oil, applied slow setting acc glue and then took some very strong, fine wire and wrapped the round shoulder of the gear with several wraps and let it sit in a small vise until the glue was dry. The glue held the gear and wire wraps in place. Obviously, the wire wraps cannot exceed the gear diameter. The author of the story said this repair was still holding after a couple of years. I hope you can get a visual from my poorly written description. John

    Leave a comment:


  • railmus
    replied
    I like to use epoxy to glue drive parts to the shafts.

    I score the shaft or sometimes file a flat spot so after the epoxy sets up there is no way the parts can slip.

    I also score the inside of the cups,etc.

    The epoxy acts like a wedge.

    Leave a comment:


  • Glen_Haasdyk
    replied
    Thanks for the feedback guys.

    Bernd, due to the size and space I don't think the tubing would work :



    There's just not enough room from what I can see.

    Louis, I tried the AC thing on the shaft, slipped the cup back on and let it set up overnight but this slippery-type plastic doesn't hold.

    I ended up buying the parts from Bachmann after all. They don't sell the cups separately, but they do sell them attached to the worm gear(4$) and motor(18$). Fortunately the cup is the same on both the motor and worm gear so I bought two worm gears and I'll just slip the cup off one and onto the motor shaft.

    Once I fix the drive I'll be installing a digitrax DZ-143 decoder and then it's off to the paint shop.

    Leave a comment:


  • desertdrover
    replied
    Glen, if Bachmann doesn't have your replacement universal cups, try AC gluing them. I have an Athearn 2-8-2 Locomotive that this happened to, and they did not have replacement parts for me. I ruffed up the shaft some, then super glued the cup onto the shaft. Several years have gone by now and this method is still holding up. As a last resort, give it a try.

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  • Bernd
    replied
    Glenn,

    Neoprean tubing (model airplane fuel line). The smallest you can get. Probably your local hardware store might carry that size tubing. Only thing I found is the hole is sometimes not on center. When the motor runs at it's highest RPM you get some vibration.

    Here's my scratchbuilt eddy current drive that I used 1/8"OD fuel line. You put a ball bearing in the tube so it bends easier for truck swivel.



    Hope this helps. Questions, just ask.

    Bernd

    Leave a comment:


  • Glen_Haasdyk
    started a topic Bachmann GE 44 ton

    Bachmann GE 44 ton

    I just got this little item of the 'bay and a pretty good price and it's not the crummy 2 motor version



    Unfortunately it had some drivetrain problems that the seller didn't mention. I found that one of the trucks didn't run so I turned it upside down and found:



    the center idler gear in each truck was in backwards and not meshing properly



    so I disassembled the trucks and re-aligned the gear and I thought I had fixed the problem when the universal coupler on one side of the motor was slipping on the motor shaft.



    It looks like both universal cups have splits and will just spin on the shafts. Now before I send Bachmann an order for new universal cups is there a way to fix these?
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