I suggest you buy some Loctite to hold that crank pin in place. Locktite is also good to hold the wheels to the axles, but when doing this you must get the alignment right. Basically, the counter weights on the wheels should all be facing the same direction or you will get the problem you might be describing. Usually the counter wights ar 90 degrees different form one side to the other. when fitting the wheels correctly, make sure the other side doesnt move out of phase. With older locos, having gears on all wheels on one side, set those first then work on the other side. Those locos with only the rear wheel driven, you have to be much more careful, but in this case, you just have to make sure they are all orientated in the same phase and at 90 dgrees side to side as described above.

When using loctite, make sure it does not get into the bearing in the chassis. The crank pin on the wheel which has come loose must also be phased correctly. look at the picture below. You will see the conrtrol rod crank is slightly behind the driving crank so long as this is fairly close to the centre line axis of the crankpin, then you should be ok.

https://www.google.com/s...69#imgrc=3xytzG0AuxWlxM:



Dereck

Your welcome. I have repaired a few like that.

I should have mentioned as well that you make sure the inner distance between the wheels is correct. If not, you will have running problems and even derailments on points. I had a BR41 which started derailing on points in the forward direction, but not in reverse. Turned out to be the front driving wheels had moved apart. Wasn't easy to diagnose the first time Í had a loco with that problem but I know now.

Trouble is, not everyone has access to a knurling tool, whereas loctite is available everywhere, and it works very well. YouYOU CAN EVEN PRIZE IT APART IF NEED BE. Loctite doesn't wear the hole out either.

Hi Alan. Thats a good article. Something I had not taken into consideration regarding the real steam locos. Luckily we don have to get the balance correct on our models becaus of such insignificant mass.

All the best From Kiwiland.

Dereck

PS dont ask me anything about electronics. My work in that respect is trial and failure. But I have got 3 sets of older tin plates carriages lit with LEDs and supplied form one pickup shoe in a goods van, and having switchable /adjustable lighting, working on both analogue and digital using the same design.

E757020
Costas

What is the catalog number of the locomotive? Check the Marklin site for the exploded diagram to confirm the part number of the nut.

Hope this helps,

Harold.

What is the road No of the Loco

Of course there are many variations E757050 is another strong possibility.

Costas

So I did some sleuthing and it appears this exact loco comes from this starter set:
https://www.maerklin.de/...s/details/article/29854/
My loco has 18473 on the cabin (is that the "road number"?) which matches the number in this set.

Unfortunately the Marklin site does not offer a detailed parts list or schematic for this locomotive.

I did find this page: http://www.hfkern.gmxhome.de/index.html which appears to show many similar BR 18.3 locos, but I didnt understand how to use the table.

However the link Joël appears to be virtually the same loco! Thank you Joël!
Based on the diagram I need the 757020 nut, so Costas you were correct, thank you. :)

While we are discussing this loco, unfortunately the sounds effects do not work. (However the lights and smoke generator do work).
I already replaced the speaker itself and that didnt help.
The decoder in the tender is 74460.
I would love to get it working.
Does anybody have any advice on how to fix it short of replacing it?
If I do need to replace it, can somebody provide a recommendation for a convenient replacement?

Thanks again everybody for all your help!
Ron

Edited by user 17 June 2020 02:21:13(UTC)  | Reason: Not specified

Hello Ron,

From Koll's it would seem your loco from the 29854 starter set (same loco as in 29855 starter set) is a 37184.10

I attach a copy of the exploded parts diagram:

parts list.pdf (260kb) downloaded 37 time(s).

Regards,

PJ