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Post by detlef10 on Oct 4, 2014 11:38:36 GMT -5
Looking for suggestions – I have an early Bachman Spectrum F40PH that has a lot of drive noise. Quiet at low speeds, but starts makes a rattling sound at about 1/3 –1/2 speed. Taken it apart (all appears tight) as well as let it run in for a few hours to see if it work work in – still the same. Any suggestions for where to look. I have a few of these and all work fine. Just one is being troublesome, and only coming from one truck assembly.
Thanks,
Detlef
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Post by malcolmcelyn on Oct 4, 2014 15:50:06 GMT -5
One drive truck? Cracked gears in final drive?
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Post by m a y o r 79 on Oct 6, 2014 7:47:41 GMT -5
Gut it and turn it intp an Amtrak NPCU  . Thats what I did with mine. Actually Ive got a second one id like to detail up but it has the same problem. Never spent any time teying to fix it though. |
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Post by iomalley on Oct 6, 2014 13:28:08 GMT -5
Yes, I agree with Mike.
The Bachmanns have the most inaccurately scaled body too. Walthers and Lifelike have nice, properly proportioned bodies, but the Kato is the best.
I have a Walthers drive you can have if you just pay shipping, you'll just need a walthers or LL body.
I also have an undec Kato for sale.
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Post by detlef10 on Oct 11, 2014 10:14:07 GMT -5
Thanks for the input. I don't think its a broken gear; at least does not act like it is. In any case, might be time to set out to pasture. Alas, I did add a lot of details on it so they don't look bad. But yes, very dated and lots of problems with scale, as well as the fuel tank and air tank areas are just wrong.
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Post by detlef10 on Oct 21, 2014 22:45:29 GMT -5
Wanted to close the loop in case people are interested in how the story ended. I ended up taking apart the loco one more time and really looked over the drive. The dog bones on the truck ends in a coupling that is right next to the plastic from the gearbox holding on the bolster. The clearance between the tower and the coupling is very, very tight. As the motor sped up, the coupling would spin faster and ever so slightly expand out due to centripetal force. On this coupling, at some point as it sped up, the coupling would contact the gear tower and make the noise. The fix was remarkably simple: shave off a little of the coupling around the circumference, as well as from the gear tower next to the coupling. Wa-la - no more noise! And a running loco. No, not perfect, and I will still upgrade some day. But for now, acceptably operational and quiet.
Thanks again for all the suggestions,
Detlef
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. Thats what I did with mine.
