Problems with the MTB SW1200

Problems with the MTB SW1200

Postby AstroGoat760 » Sun Jan 24, 2016 9:58 pm

A pair of my SW1200s has developed some sort of problem where the locos are either not working or only driving in one direction. The motors turn freely and there does not seem to be any resistance with the gear sets, so I am a tad bit stumped as to what the problem is.

Any advice?
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Re: Problems with the MTB SW1200

Postby AstroGoat760 » Sun Jan 24, 2016 11:29 pm

I partially dissected one, and the motor will not turn by itself when power is applied. If you spin the motor while applying power, it will run for a bit.
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Re: Problems with the MTB SW1200

Postby AstroGoat760 » Sun Jan 24, 2016 11:30 pm

Does anyone know of a good replacement motor for the MTB SW1200?
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Re: Problems with the MTB SW1200

Postby rdikken » Mon Jan 25, 2016 4:46 am

Which SW1200's, where and when did you buy them?

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Rob Dikken
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Re: Problems with the MTB SW1200

Postby AstroGoat760 » Mon Jan 25, 2016 10:09 am

rdikken wrote:Which SW1200's, where and when did you buy them?

Kind regards,
Rob Dikken

Soo Line #1216, and Norfolk and Western #2111

I bought them from Sazmodel the very day that they became available to buy.

Neither has more than 50 running hours on them.
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Re: Problems with the MTB SW1200

Postby rdikken » Mon Jan 25, 2016 4:50 pm

Give me a pn with your email address.

Ciao ,
Rob
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Re: Problems with the MTB SW1200

Postby AstroGoat760 » Sat Jan 30, 2016 7:14 pm

Well, the problem has been traced down to the motor itself.

Since the loco is well over a year old, the warranty is over and I opted to disassemble SOO Line #1216 to determine the cause of the fault.

The motor runs (when it does) roughly, with an audible and visual wobble. There are a few "rough spots" in the motor's rotation, with definite periods of resistance when the motor is spun by hand.

At least half the time, the motor needs to be spun with power applied before it will rotate on its own, there does not seem to be enough force to turn the gearboxes without stalling the motor out.
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Re: Problems with the MTB SW1200

Postby ConducTTor » Sun Jan 31, 2016 2:22 am

Actually I had the same problem with one of my 1200s (the one that's gotten the most use). Had to get a new motor from MTB. Perhaps the motors are not the best.....my theory is that the plastic ends (which hold the shaft in place) become loose over time.
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Re: Problems with the MTB SW1200

Postby ctxmf74 » Sun Jan 31, 2016 4:44 pm

" Had to get a new motor from MTB. Perhaps the motors are not the best....."

I haven't looked closely at the motors but perhaps a better quality one could be installed. I bought a nice small coreless motor on ebay to replace the motor in an HOn3 SP diesel model. ...DaveB
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Re: Problems with the MTB SW1200

Postby AstroGoat760 » Sat Feb 06, 2016 9:51 am

Here is a video of the problems with the two locomotives, since I figure a demonstration is better than just trying to explain the problems.
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