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Offline Rocca  
#1 Posted : 11 December 2025 21:58:33(UTC)
Rocca

Italy   
Joined: 28/01/2004(UTC)
Posts: 640
Dear Märklin friends,
I found a low-sided 8610 wagon on eBay, but unfortunately, one of the two couplers doesn't return to the correct position on curves, due, I suspect, to a defective spring. I'm sure that years ago, for a similar problem, I found both instructions and videos on YouTube explaining how to replace the defective coupler. Also, can you please tell me the exact original spare part number for replacing the couplers? Is the number E166264 (Kupplung lang) the correct one?
Thank you in advance for any help you can provide!
Sincerely!
Prof. Stefano Rocca
Offline Zme  
#2 Posted : 12 December 2025 04:54:24(UTC)
Zme

United States   
Joined: 02/10/2013(UTC)
Posts: 893
Location: West Texas
Hello, hope all is well.

It is possible your coupler is one of the original designs and may be causing the problems you mentioned.

Below is a photo which shows the difference between the two coupler designs.

UserPostedImage

The coupler on the right shows the new coupler. Compare this to yours. Yours might not be chamfered.

Your replacement part number is correct. You might want to replace couplers on both sides of your wagon. Your dealer should be able to get these for you.

Keep an eye on those coupler springs, they are easy to lose.

Take good care

Zme
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