LGB-2-6-0 motor problem - myLargescale.com > Community > Forums

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Old 03-27-2017, 11:08 AM   #1 (permalink)
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Default LGB-2-6-0 motor problem

I need everyone to put on their thinking caps for an issue that I have with an lgb 2-6-0 locomotive.

The loco in question had a bad motor. I know this because with almost full throttle the motor wouldn't run unless you bumped it by hand. I bought a new motor and it works fine. Well, sort of. lol

With the assembled motor block on my bench and power attached to the motor leads it runs very smoothly forward and reverse. When it is installed it will only run in reverse, smoothly like it should. In forward, firebox flickers, headlight comes on but no motor. Where should I look to solve this problem? three of us are scratching our heads over this and wondering if we missed something obvious. Would a bad board cause this issue?

Thanks for your help, I check in periodically during the day so bear with me if I don't respond right away.

Bill
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Old 03-27-2017, 12:22 PM   #2 (permalink)
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Which LGB 2-6-0 model is it? The USA styled one with tender? Analog or digital sound?

Andrew
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Old 03-27-2017, 12:34 PM   #3 (permalink)
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The usa styled one in a D & RG style. I believe it has analog sound.
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Old 03-27-2017, 05:21 PM   #4 (permalink)
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It maybe best to quote the model number as there were quite a few different models.
I know there were differences in the wiring for the digital sound ones.
Is it 2018D Red and green Number 18? I have the same.
Or 21181 Black boiler Number 19?

Andrew

Last edited by Garratt; 03-27-2017 at 06:37 PM.
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Old 03-27-2017, 05:35 PM   #5 (permalink)
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Try testing it on it's side touching the wheels with some wires then do the same on just the contacts.
Do you get the same result as on track?
Does the rear tender light work when plugged in and running in reverse?

Andrew
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Old 03-27-2017, 06:31 PM   #6 (permalink)
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Something is very strange, like a miswire of the motor on the wrong side of a diode for directional lighting.

Is this a 3 wire or a 4 wire motor block?

Greg
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Old 03-27-2017, 06:35 PM   #7 (permalink)
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I was thinking similar Greg.
Here is a manual for the 2018D. Same wiring for 21181.
http://www.lgbworld.com/service_manuals/2018D-1.PDF

LGB did something weird with the polarity colors to the tender. The OP may have been stooged somehow. See below:
http://forums.mylargescale.com/21-ro...-miswired.html

Andrew

Last edited by Garratt; 03-27-2017 at 06:52 PM.
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Old 03-27-2017, 06:42 PM   #8 (permalink)
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Looks like a 3 wire block, so there would have to be a diode between the 2 wires that are switched with the motor on off switch.

The diagram suggests that the 3 wires go directly to the tender plug, but they must go to that #49 part since that is where the headlight and smoke unit connect.

Does this loco have the slide switches for lights and motor and smoke on off?

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Old 03-28-2017, 07:34 AM   #9 (permalink)
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Tender plug on LGB 3 wires to the tender have 2 track power wires and one wire for the rear light on coal tenders.Rear light references one track wire for the light!!. (Wood tender has no light but does have the wiring).

Motor block has 3 wires, one rail is tied directly to the motor, the other 2 are for the rear switch should be on highest number (all the way to the right as viewed from the tender).
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Old 03-28-2017, 11:10 AM   #10 (permalink)
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First off, thank you for the responses. The loco is a model #26194. The motor block has a four prong, flat plug that can only be installed one way. I have determined (I hope correctly) that the out side leads go to the motor and the inside two are from the pickups to the circuit board.

Garratt: With the assembled motor block on the bench applying power to motor leads it works fine, forward and reverse. After installation it only works in reverse, although the front light and boiler lights work fine come on when in forward mode. No hum, no motor noise, nothing from the motor.

By the way, reversing the motor in the block will allow it to run forward, but not in reverse with the lights coming on opposite of the motor direction as expected.

I hope this helps. Thinking out loud, I wonder if testing the motor plug might help. Applying power to the pick up side and then reversing polarity, simulating a direction change for the motor. If polarity reverses, or not, it might tell me if the problem is elsewhere. Hmmmmm......suggestions?

Bill






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