I have a Lionel genset with one weak coupler. They both fire open when I press the corresponding button but the front one is weak and the rear one opens with authority. Is there anything I can do to make the front one open strong or just replace it?
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Probably replace it (don't throw it away...nice for the parts box), but you might check the internal plug. I doubt that the problem is there, but de-bug before you re-buy - you'll have to plug in a new one, anyway.
I assume that it's causing you problems when uncoupling/disconnecting? If not, and it opens, so what?
It may just be the knuckle spring, they're replaceable, however you do have to remove the knuckle rivet and replace it with a new one. When I have couplers that give me issues, I disassemble them, and smooth all the interior mating surfaces. That will usually result in a smooth operating coupler that can couple up with very little pressure so you don't have to bash the locomotive into the cars to connect.
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