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Offline Brakeman  
#1 Posted : 24 January 2016 01:45:23(UTC)
Brakeman

United States   
Joined: 14/04/2006(UTC)
Posts: 298
Location: Southern California
I needed to fix the loose center axle boss in the Märklin 7286 Turntable.
That required removing the bridge including the motor and gears.

I must have missed something when putting everything back. The bridge won't rotate until I push the lever under the bridge outwards for a second. This is the lever that disengages the gears if you push it inwards.

Anyone here familiar with the matter?
Thanks,
Juha

WP_20151106_18_10_35.jpg
WP_20151106_17_59_57.jpg
Offline carlos.rivas.16752  
#2 Posted : 24 January 2016 17:09:23(UTC)
carlos.rivas.16752

Spain   
Joined: 08/04/2015(UTC)
Posts: 303
Location: Vigo, Spain
http://www.trescarriles....otonda-marklin-7286.html

This site is in spanish, sorry for that but maybe the pics could be useful to you
Regards
Carlos
My blog both in Spanish and English: https://grunewiesen1965.wordpress.com
thanks 1 user liked this useful post by carlos.rivas.16752
Offline JohnjeanB  
#3 Posted : 11 February 2016 16:07:52(UTC)
JohnjeanB

France   
Joined: 04/02/2011(UTC)
Posts: 3,083
Location: Paris, France
Hi Juha,

From what you describe, it seems that the little spring that pushes the motor assembly against the teethed edge around the bridge hole is missing. This is if you hear the motor but lt is not driving anything.
Note the spring can clearly be seen on your pics so it the motor assembly moving freely?

The other point to watch is that when putting back the bridge, it must be guided vertically so that no contact blade is bent. This is if you don't hear the motor. I use a tooth pick in the center screw to make sure I guide the bridge vertically.
Cheers.
Jean
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Offline Chook  
#4 Posted : 12 February 2016 13:04:07(UTC)
Chook

Australia   
Joined: 15/08/2012(UTC)
Posts: 234
Location: Perth, Western Australia.
Juha, Is it possible that the metal armature of the motor is spinning within a cracked primary sprocket?
To test this theory try gently turning the armature with your fingers while applying resistance with your other fingers on the large sprocket which engages the circumference of your turntable.

Regards.......Chook.
thanks 1 user liked this useful post by Chook
Offline Brakeman  
#5 Posted : 17 May 2016 07:45:43(UTC)
Brakeman

United States   
Joined: 14/04/2006(UTC)
Posts: 298
Location: Southern California
Thanks everyone for the help,

specially Carlos for the link to perhaps the most extensive M turntable study ever!
My Spanish is lousy, but I punched the link in to Google Translator.

I was able to troubleshoot the turntable and locate the problem. The solenoid was not pulling the long metal actuator rod far enough to start the motor.
To get by, I cut a piece of 0.4 mm styrene in the slot where the solenoid lever is pulling the actuator. That removed the end play and extended the travel.

Keep on shunting,
Juha

WP_20160516_18_14_27.jpg


Originally Posted by: carlos.rivas.16752 Go to Quoted Post
http://www.trescarriles.com/rotonda-marklin-7286.html

This site is in Spanish, sorry for that but maybe the pics could be useful to you
Regards
Carlos
thanks 2 users liked this useful post by Brakeman
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