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Offline Brian_BR96  
#1 Posted : 18 June 2024 01:41:48(UTC)
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Brian_BR96

United States   
Joined: 22/05/2020(UTC)
Posts: 32
Location: West Hartford, CT
Hi all, I got my starter set out of storage and put the lok on my layout which is mostly inclines and it struggles with its single traction tire. I'd like to modify it to be able to take two traction tires. Has anyone done something like this?

A quick search of the parts catalog shows many wheels are discontinued. I could possibly cannibalize another locomotive but I'd rather not if I don't have to. This lok is special to me and I'd like to get it running nicely on my mountainous layout. Thank you
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Offline JohnjeanB  
#2 Posted : 18 June 2024 10:23:13(UTC)
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JohnjeanB

France   
Joined: 04/02/2011(UTC)
Posts: 3,551
Location: Paris, France
Hi Brian

I am not sure adding another traction tyre is a good idea as it would increase the contact issues in a huge way especially if you use contact tracks.
Better change the existing TT for a new one as, when aging TT become harder and oily.
Märklin does not sell spare wheels for the 3000 or the 30000 but you may purchase this
spare driving axle
Then you may replace the wheel w/o traction tire with the one with it.

Cheers
Jean
My layout videos
latest vid
marshalling yard
My Layout
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Offline Brian_BR96  
#3 Posted : 18 June 2024 17:54:04(UTC)
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Brian_BR96

United States   
Joined: 22/05/2020(UTC)
Posts: 32
Location: West Hartford, CT
Hi John, thank you for your reply. I will try replacing the tire and see how that goes.

I do not have any contact tracks on my layout. It is a small one, basically a folded over figure-8. In a comparison, my 3078 has dual traction tires and doesn't have electrical contact issues. Comparing the parts sheets, it looks like I can try the left hand side traction tire wheel of a 3031/3032. I do have a 3032, but it is very old and original and I'd like to keep it intact. We'll see how it goes.
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Offline JohnjeanB  
#4 Posted : 19 June 2024 00:29:57(UTC)
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JohnjeanB

France   
Joined: 04/02/2011(UTC)
Posts: 3,551
Location: Paris, France
Hi Brian
The 3000 was designed around 1953 and now the technique has changed.
In those days, the middle axle(s) has only a decorative role (does not touch the rail) so basically you loco has in reality 2 axles.
If you install traction tires on both wheels with a perfect loco and a perfect track your contact with rails is on 2 points.
If for ANY reason your track is warped (even very little) or if the loco has not been engined / drilled perfectly you have only ONE wheel contact for ground return.
If the wheel contact is on the side of a contact track, then you have ZERO contact and the loco stops

This is why, now, that more and more, the axles are given some vertical play and have hidden pressure springs
Here is an example of a 5 driving axles Märklin loco (37166) with vertical play and pressure springs (circled in red)
Sans titre.png

Sorry for the long and boring explanation but the 3000 is not helped by an excellent current pick-up and that is why adding another tire would be detrimental.
Cheers
Jean
My layout videos
latest vid
marshalling yard
My Layout
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Offline Paul59  
#5 Posted : 19 June 2024 10:28:26(UTC)
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Paul59

United Kingdom   
Joined: 25/08/2012(UTC)
Posts: 250
Location: South East
Excellent description by Jean there...

I have been looking through some catalogues from 1953 onwards and it looks as though the CM800/3000 has always been produced with traction tyres on both rear wheels.
My old CM800s definately have two and so do my later 3000s.

Were there some produced that only had one grooved wheel - versions that came in sets perhaps?
Marklin HO using M track. Now reverted to analogue as I find it has more character and is more fun...... and I understand it!
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Offline Brian_BR96  
#6 Posted : 19 June 2024 14:50:25(UTC)
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Brian_BR96

United States   
Joined: 22/05/2020(UTC)
Posts: 32
Location: West Hartford, CT
I thought I saw different versions over the years. Mine with one tire came from a 2916 Delta set in 1993. I looked up a parts diagram on Dolfmeister and it shows just one tire, on the right hand side of the locomotive, though I can't find a date on the diagram, other than it shows a mechanical reversing unit.
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Offline Michael4  
#7 Posted : 19 June 2024 17:00:59(UTC)
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Michael4

United Kingdom   
Joined: 02/02/2017(UTC)
Posts: 694
Location: England, South Coast
3029 can be found with one tyre only, not seen a 3000 with only one.
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Offline Hameln-Ratte  
#8 Posted : 19 June 2024 18:01:02(UTC)
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Hameln-Ratte

United States   
Joined: 13/08/2023(UTC)
Posts: 6
Location: California, Folsom
I also have a 3000 with one traction tire and Delta (secondhand so I don't know its source or date) and always wondered about that. I'm following this thread with interest. Thanks for all the info!

- Vince
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Offline Brian_BR96  
#9 Posted : 19 June 2024 19:53:56(UTC)
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Brian_BR96

United States   
Joined: 22/05/2020(UTC)
Posts: 32
Location: West Hartford, CT
In the title of the parts diagram I found the date of 2001. I searched around for a prior parts diagram and found this

https://www.marklin-user...artsinfo/infoheading.htm

and in the 3000 exploded view/parts list I found the part for the older traction tire wheel, part number 20021. In the (newer?) parts diagram of the 3031/3032, which shares what looks to be the same diameter and style wheels, the non-geared side traction tire wheel is listed as 200210, no doubt the extra zero has been added as the parts catalog grew.

I went on ebay and found a non running 3000 locomotive from which I can source the part as they are discontinued. I also have a 3095 which only has one traction tire and I found a wheel from a 3096 that looks like it will work, found on ebay as well.
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Offline cookee_nz  
#10 Posted : 22 June 2024 08:27:27(UTC)
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cookee_nz

New Zealand   
Joined: 31/12/2010(UTC)
Posts: 3,991
Location: Paremata, Wellington
Just a quick comment regarding the outer rail return electrical path.

If the Loco is hauling wagons of the same era, they will be all-metal and assist in giving an additional electrical path via the couplings, frame and wheels of the wagons.

It's not ideal of course with several potential points of resistance, but I've had a similar experience and found it does make a noticeable difference so adding another traction Tyre may not have a negative impact.

Cheers
Cookee
Wellington
NZ image
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