Re: Jerky movement on Athearn Genesis F7 "B" unit



Scott wrote:

> Hi, I have a set of athearn gensis F7 A&B units. The "A" unit works
> fine, but I find at very slow speeds the "B" unit tends to go normal
> speed, then slow, then normal, then slow.
>
> This only happens on the lowest speed settings (I'm using DCC). I
> don't think its anything decoder related. Also this is very regular,
> it definitely has a cycle to to.
>
> Any ideas? One of the members at my train club suggested the engine
> just needed to be "broken in" - but I've given it 20 or 30 laps around
> the modular layout (probably 120' total around). Could this be the
> issue, or could it be something else.
>
> P.S. I'm scared of taking apart engines, but I did on this one. Made
> sure none of the decoder and/or wires were touching the flywheels,
> etc.
>
> Thanks in advance,
> Scott

Try taking the decoder out and running the loco on smooth DC. - if it
cycles then the problem is in the mechanisim. If it doesn't then the
problem is with the decoder.

.

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