Hey all!

I have a friend that recently bought her daughter her first Marklin set 29721 and her family set everything up. The daughter sent me a video of her setup, as they know I'm a long time Marklin evangelist. It looked great!

Earlier this week, I went to their home to view the new addition to their family (Marklin) and the locomotive habitually derailed on curves. I noticed that it was a 0-10-0 arrangement and saw that the loco had spring loaded wheels (left to right) to compensate for the curved track.

Does anyone have any advice for this problem? I don't have one of these models and it doesn't make sense why it would constantly derail like this. Nothing seems to be "bent" or out of place. She's a very careful little girl and hasn't dropped it or "crashed" her trains in fun.

Please advise..

Thanks,

Michael

Hi,

maybe some close pictures of the bottom of the loco will help .

Does the loco derails on curve upon a turnout ?
Does a buffer or a coupler catching something ?
Maybe the slider is not well "clicked" in the loco chassis ?
Does the loco also derails without any wagon behind ?

Best Regards
Joël

Thanks for all of the helpful responses.

To answer a few questions,

It derails both with and without stock.

It works fine on the straight sections.


Only derails as soon as it starts a curved section.

I asked the girl to take a couple of pics...



Thanks,

Michael

Hi
I agree with Henrik The top right picture shows a bent driving rod.

This may happen when one (or more) driving wheels have lost their quartering or when the wheel screw is bumping on (may be a driving rod).
I have a similar loco:

The KPEV T16 Märklin 37166 (2014) runs like a charm has a smoke generator and Telex couplings.

The first production run of this Märklin loco 37160 back in 2012 had a number of issues with the distribution gears so a close inspection is needed.
Attention not all the screws have the same length and there are some washers to put back in their proper location.
Cheers
Jean

Good. If I may add, it not only about straitening the driving rod but also about checking that the screw which caused the bending is the proper one (it should be shorter with a flatter head).
With my limited vision I highly recommend using illuminated magnifying glass.
Testing must be made by removing the motor to verify that whatever the curve is and its direction (to the left or to the right) no jamming is possible. A very light bending of the driving away from obstacles like the screw may help.
Good repair
Jean

Sorry to hear about this happening, good luck with repairs!

I've got the same 37160 - 94 713 loco and thought i'd add about the problem i've had incase it may be part of the cause. Or even just something to look for when reassembling.
I can't tell in the picture if this loco has the problem, you almost need to shine a light to see i think.


I had a problem where the "metal sprung" bits on the chassis got on the wrong side of the wheels. They are on the front 4 pairs only. This caused the motor to struggle and cease/die as the wheels got jammed. These parts push the wheels back to center after going through curves.



ref: exploded diagram from the manual at
https://www.marklin.com/...ts/details/article/37160


Fixing this was tricky, the very front set is i think impossible to do without dropping the gearing cover set... but you have to be very careful to align the guides and get it all flush (rods included) when reassembling.

Hopefully you don't have that problem but if you are taking rods off and the bottom wheelset cover then be aware of these little metal sprung pieces

I think that is “ok.” The rear most set is free to move side to side and has no sprung metal pieces to guide it back to Center

Edit: sorry mike c, didn’t see the note about lube till after I posted

How do I check the quartering? Is that the alignment of the offset wheel weights? Should they all be in line with one another?

I don't know if I am seeing right - and it may be difficult to judge from the photograph above - but it looks to me as if the front axle (topmost in the photo) is a bit wider than the others. It may have contributed to the other issues.