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Offline Z-nerd  
#1 Posted : 11 November 2016 10:30:57(UTC)
Z-nerd

Sweden   
Joined: 10/10/2012(UTC)
Posts: 95
Location: Linköping, Sweden
So I ran my 8891 continuously for 30 minutes and then when I ran it again it twitched and only went backwards.

The loco is not moving forwards, but the motor runs both ways.

I disassembled the loco, removed the motor and discovered that the drive shaft was worn out.

I checked for spare parts at http://www.maerklin.de/ but the loco 8891 is not manufactured anymore and it seems like they dont have any spareparts for it in stock either.

Any suggestions how to find a new drive shaft or at least similar cogwheel ?


8891
The motor is removed.

drive shaft 8891
The driveshaft is worn out.
thanks 1 user liked this useful post by Z-nerd
Offline Markus Schild  
#2 Posted : 11 November 2016 11:32:02(UTC)
Markus Schild

Germany   
Joined: 14/01/2006(UTC)
Posts: 1,802
Location: Wurttemberg
Hi,

You can get the driveshaft 261870 from here:

http://www.ebay.de/itm/M...2d6c1:g:BYMAAOSwvzRXzxoP

or from here:

http://www.amundsenhobby...%20&kategori_far2=97

Regards

Markus
thanks 3 users liked this useful post by Markus Schild
Offline Z-nerd  
#3 Posted : 11 November 2016 13:22:58(UTC)
Z-nerd

Sweden   
Joined: 10/10/2012(UTC)
Posts: 95
Location: Linköping, Sweden
Originally Posted by: Markus Schild Go to Quoted Post
Hi,

You can get the driveshaft 261870 from here:

http://www.ebay.de/itm/M...2d6c1:g:BYMAAOSwvzRXzxoP

or from here:

http://www.amundsenhobby...%20&kategori_far2=97

Regards

Markus


It seems like ebay.de has the cheapest shipping-EUR 6,90 worldwide. The norwegian shop wants 14EURO for posting that tiny thing to neighbouring Sweden.Cursing
Offline baggio  
#4 Posted : 11 November 2016 14:07:55(UTC)
baggio

Canada   
Joined: 21/09/2012(UTC)
Posts: 1,729
Location: Toronto
Originally Posted by: Z-nerd Go to Quoted Post
It seems like ebay.de has the cheapest shipping-EUR 6,90 worldwide.


Thanks for the tip. I keep on hearing good things about E-bay.de - too bad I don't read German and Google only helps so far.

Out of curiosity, what is it about the drive shaft that led you to conclude it's worn out? The picture does not help me. Thanks.
Offline Z-nerd  
#5 Posted : 11 November 2016 14:11:45(UTC)
Z-nerd

Sweden   
Joined: 10/10/2012(UTC)
Posts: 95
Location: Linköping, Sweden
Originally Posted by: baggio Go to Quoted Post
Originally Posted by: Z-nerd Go to Quoted Post
It seems like ebay.de has the cheapest shipping-EUR 6,90 worldwide.


Thanks for the tip. I keep on hearing good things about E-bay.de - too bad I don't read German and Google only helps so far.

Out of curiosity, what is it about the drive shaft that led you to conclude it's worn out? The picture does not help me. Thanks.



Dont you see that it's worn out compared to the new drive shaft ?

shaft
shaft
Offline baggio  
#6 Posted : 11 November 2016 14:47:47(UTC)
baggio

Canada   
Joined: 21/09/2012(UTC)
Posts: 1,729
Location: Toronto
Did the new shaft solve the problem?

(I only see that the new shaft looks sharp, but not that the old one is worn out. Sorry.)
Offline Markus Schild  
#7 Posted : 11 November 2016 14:52:17(UTC)
Markus Schild

Germany   
Joined: 14/01/2006(UTC)
Posts: 1,802
Location: Wurttemberg
Hi Baggio,

Look at the worm-gear. No tooth any more.

Regards

Markus
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Offline H0  
#8 Posted : 11 November 2016 15:06:51(UTC)
H0


Joined: 16/02/2004(UTC)
Posts: 15,254
Location: DE-NW
Originally Posted by: baggio Go to Quoted Post
I only see that the new shaft looks sharp, but not that the old one is worn out.
The worm drive has one tooth that takes five rounds around the shaft. All five rounds originally look the same.
On the worn drive the tooth is much smaller and much wider in the middle. Loco stopped because the cog-wheel no longer made contact.

The worm is like a screw, a cylinder screw - when it is new.
Regards
Tom
---
"In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS
UserPostedImage
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Offline waltklatt  
#9 Posted : 11 November 2016 15:29:27(UTC)
waltklatt

United States   
Joined: 17/03/2012(UTC)
Posts: 138
Why did it wear out so quickly after 30 mins?
Must be some other issue there? Heavy friction on the gears?
Only that worm gear worn out, how about the other gears?
Puzzling....Confused Confused
Offline Markus Schild  
#10 Posted : 11 November 2016 15:44:22(UTC)
Markus Schild

Germany   
Joined: 14/01/2006(UTC)
Posts: 1,802
Location: Wurttemberg
Hi,

It was not worn in 30 minutes but in several years. It was just the last 30 min run which took the last 1/100 mm which decides between mesh and no - mesh.

Regards

Markus
Online kiwiAlan  
#11 Posted : 11 November 2016 15:51:31(UTC)
kiwiAlan

United Kingdom   
Joined: 23/07/2014(UTC)
Posts: 8,082
Location: ENGLAND, Didcot
Originally Posted by: waltklatt Go to Quoted Post
Why did it wear out so quickly after 30 mins?
Must be some other issue there? Heavy friction on the gears?
Only that worm gear worn out, how about the other gears?
Puzzling....Confused Confused


I understood he ran it in only one direction for 30 minutes. It was when he changed direction that he discovered it wouldn't run that way. Thi sis probably the reason it was sold to him, without being told it is faulty.

Offline cookee_nz  
#12 Posted : 11 November 2016 20:48:13(UTC)
cookee_nz

New Zealand   
Joined: 31/12/2010(UTC)
Posts: 3,948
Location: Paremata, Wellington
Originally Posted by: baggio Go to Quoted Post
Did the new shaft solve the problem?

(I only see that the new shaft looks sharp, but not that the old one is worn out. Sorry.)


Compare detail....

worm-good.jpgworm-worn.jpg

Should be more apparent - if you are not used to spotting wear on gears, this will surely help you for future :-)
Cookee
Wellington
NZ image
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Offline Z-nerd  
#13 Posted : 09 December 2016 19:51:44(UTC)
Z-nerd

Sweden   
Joined: 10/10/2012(UTC)
Posts: 95
Location: Linköping, Sweden
Finally I received my new drive shaft. Total cost with shipping 12.85 EUR. Quite a lot for such a small part.


UserPostedImage

It was not very difficult to change the drive shaft. Now the old loco runs as usual again.




My video of the change of the driveshaft. (No english)
thanks 1 user liked this useful post by Z-nerd
Online kiwiAlan  
#14 Posted : 11 December 2016 00:44:40(UTC)
kiwiAlan

United Kingdom   
Joined: 23/07/2014(UTC)
Posts: 8,082
Location: ENGLAND, Didcot
Originally Posted by: Z-nerd Go to Quoted Post
Finally I received my new drive shaft. Total cost with shipping 12.85 EUR. Quite a lot for such a small part.


It was not very difficult to change the drive shaft. Now the old loco runs as usual again.


Oh excellent. Price sounds not too bad to me considering it is a reasonably complex part to make.

And now you have a load for a flat car ... BigGrin BigGrin BigGrin ThumpUp ThumpUp

Offline Z-nerd  
#15 Posted : 11 December 2016 22:44:34(UTC)
Z-nerd

Sweden   
Joined: 10/10/2012(UTC)
Posts: 95
Location: Linköping, Sweden
Originally Posted by: kiwiAlan Go to Quoted Post
Originally Posted by: Z-nerd Go to Quoted Post
Finally I received my new drive shaft. Total cost with shipping 12.85 EUR. Quite a lot for such a small part.


It was not very difficult to change the drive shaft. Now the old loco runs as usual again.


Oh excellent. Price sounds not too bad to me considering it is a reasonably complex part to make.

And now you have a load for a flat car ... BigGrin BigGrin BigGrin ThumpUp ThumpUp



Well. There was no other option, than to order it from german ebay. A norwegian shop was cheaper, but they didnt ship anything abroad.

The 8891 loco is old and this spare part is not manufactured anymore and it's also sold out at the Märklin factory.

In another modelrailway forum, someone was surprised to see that I didnt lubricate the cogwheel.

I dont do that anymore, because I run my locos quite rarely and I am afriad of that horrible hardened oil syndrome.Cursing

Yes, what will I do with that worn out drive shaft ? as you wrote maybe it could be a load for a flat car.
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