MTB SW Locomotive Motor Refit

MTB SW Locomotive Motor Refit

Postby AstroGoat760 » Sat May 19, 2018 10:50 pm

For those that are not aware, I have not had the greatest of luck with MTB's SW locomotives in terms of their motor's longevity. I tend to run trains A LOT, and as a result, rack up a lot of running hours, so that may be part of the issue.

Anyways, I was pointed towards some motors that would be a good fit for the MTB SWs, in terms of size and power (torque).

The shafts are the same diameter, and the motor casing is the same in height and width, but is a good bit shorter than the stock MTB motor.

Here is my original test motor, "Motor Zero", along with the shortened "Motor Alpha", next to a armature shaft from a MTB motor with a bad bearing, for example of the needed length of the shafts:
IMG_2334.JPG
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Re: MTB SW Locomotive Motor Refit

Postby AstroGoat760 » Sat May 19, 2018 11:07 pm

Here is the test-fit motor installed in the motor cavity of N&W 2111:
IMG_2336.JPG
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Re: MTB SW Locomotive Motor Refit

Postby AstroGoat760 » Sat May 19, 2018 11:13 pm

And here is the wired-up motor and chassis assembly, with plenty of excess wire all around, as this is a test article, and as such is prone to modifications for production-line usage:
IMG_2337.JPG
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Re: MTB SW Locomotive Motor Refit

Postby AstroGoat760 » Sat May 19, 2018 11:23 pm

Here is the link to the discussion covering the motors used in the refit process:
https://www.ttnut.com/motors-t3145.html
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Re: MTB SW Locomotive Motor Refit

Postby AstroGoat760 » Sun May 20, 2018 12:01 am

Here is a video of the test loco with new motor:
https://youtu.be/ZqFQ6YZaQHc
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Re: MTB SW Locomotive Motor Refit

Postby AstroGoat760 » Sun May 20, 2018 10:48 am

The test-article SW has been running for roughly 12 hours now, and no ill effects to note thus far.

Give it another day, and if it succeeeds (which I feel it will), then production-line modifications of the remainder of my MTB SW fleet will commence.
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Re: MTB SW Locomotive Motor Refit

Postby RodTT » Sun May 20, 2018 1:08 pm

Great stuff. Was it straightforward to do? Did you have to butcher the chassis at all?
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Re: MTB SW Locomotive Motor Refit

Postby AstroGoat760 » Sun May 20, 2018 4:06 pm

RodTT wrote:Great stuff. Was it straightforward to do? Did you have to butcher the chassis at all?

The refit was fairly straight-forward to complete, as the dimensions of the replacement motor were either the same or smaller than the stock motor. No modification of the chassis was required at all.

The hardest part of the entire endeavour was to make sure that the shaft length of the new motor was cut to the correct size for the task.
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Re: MTB SW Locomotive Motor Refit

Postby AstroGoat760 » Sun May 20, 2018 4:14 pm

I do plan on better documenting the second refit better, as that will incorporate lessons learned from the first refit, for the benefit of those that may be curious as to how I completed my refit.

The only issue that I can see right now is that as the replacement motor is smaller than the original motor, there will be a slight reduction in adhesive weight of the loco, and that may impact how many railcars the chassis can pull.
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Re: MTB SW Locomotive Motor Refit

Postby AstroGoat760 » Sun May 20, 2018 7:10 pm

So far, so good.

The test article SW has been pulling five freight cars for about 6 hours now, with no ill effects at about 10.50 VDC.
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