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Electrical problem fixed on culvert unloader now drive tire is shot

pennsyfanpennsyfanOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

Thanks to those that offered help on my question about Lionel Exploded view parts and schematics.

With the little information that Lionel provided, we did make progress last night on the 12983 Culvert Unloader that doesn't run. The board, motors and switches all checked out; however we ran across a component that was foreign to us. It appears to be two diodes that are facing each other. They are in series on one leg of the leads from the board to the magnetic lift assembly motor. The information reads as 35-ID10 and then there is ETC where the E looks like a C with a line in the middle. These are brown in color with a silver band at 1 end. The silver band are facing one another.

It was suggested that it may be a voltage regulator. If that is so, how do we determine the acceptable voltage? This part may be operating as designed and not a trouble at all; but we do no that the motor fed by this lead is not running when it should.

Last edited by pennsyfan
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S stan2004OGR Forum Member
Could be a pair of zener diodes in series. Placing them facing each other as you describe drops the voltage by the sum of the Zener diode voltage plus a regular diode.

With power to circuit OFF, apply a 9V battery in series w/1k resistor to one of the mystery components. Measure the DC voltage across the component. Reverse the battery polarity and measure again. If it's a Zener diode, in one direction you'll read about 0.6V (a normal diode drop) and in the other direction you'll read the "Zener voltage" which tells you the value. Then do the same to the other component.

My guess is one of the components is "open" and you'll read the 9V battery voltage in both directions.

pennsyfanpennsyfanOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

Stan,

Your test was helpful, thanks so much.

The readings were  erratic on one and NG on the other diode. We thought we had a good match out of some old parts but it didn't pan out. This past Tuesday we installed two new Zener diodes that were 5 1/2 volts. The unit ran great although a little slow. So now we are thinking that maybe the voltage has to be tweaked up a tad.

 

Now here is the next problem. While allowing the accessory to run for testing; the rubber tire split in two. Of coarse it's listed as unavailable on the Lionel website. They are still pushing this product out; but where are the parts?

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