 Joined: 24/12/2024(UTC) Posts: 2 Location: Louisiana
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Hello all -
I created this account just to ask this question. I am helping my family with assembling a small track for Christmas. Our Marklin 6177 seems to have lost the ability to control speed of the locomotive. Changes in knob position do not affect the locomotive's speed - it only operates at a near the highest speed. Is this an issue that can be troubleshot or resolved? Thank you for the help and let me know if more information is needed.
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 1 user liked this useful post by Lostcajun
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Joined: 10/02/2021(UTC) Posts: 3,889 Location: Michigan, Troy
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Theere is at least one YouiTube video on restoring one. It may only need a cleaning of the rheostat.
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 Joined: 04/02/2011(UTC) Posts: 3,563 Location: Paris, France
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Hi LostCajun Welcome to this great forum Here is a cajun from France  . I am jockin but I live in Paris but go often to Normandy where most Cajun came from I think Regarding these transformers - you may open them by straingtening the protruding pieces of steel to unlock the upper case in place - caution by opening, there still will be a wire in place (between the cursor attached to the red button and the "B" output - then you have to inspect the power cord for any damage (often with early models) and possible replacement - then it is about cleaning the cursor's path on the winding and having lithium grease back on the path - in your case, the metal finger needs probably to be bent A LITTLE so that the contact is better - close the casing and bent the protruding metal to lock it in place WARNING: do not try to open the assembly around the red button and its bass finger. It would be a lost cause, a lost spring Here is mine once opened  Cheers Jean |
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2 users liked this useful post by JohnjeanB
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 Joined: 28/11/2007(UTC) Posts: 8,226 Location: Montreal, QC
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Make sure that the wires to the track are connected to the brown and red outputs and not to the yellow one
If this does not resolve the issue, proceed as described by Jean
Regards
Mike C
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3 users liked this useful post by mike c
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Joined: 24/12/2024(UTC) Posts: 2 Location: Louisiana
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Originally Posted by: JohnjeanB  Hi LostCajun Welcome to this great forum Here is a cajun from France . I am jockin but I live in Paris but go often to Normandy where most Cajun came from I think Regarding these transformers - you may open them by straingtening the protruding pieces of steel to unlock the upper case in place - caution by opening, there still will be a wire in place (between the cursor attached to the red button and the "B" output - then you have to inspect the power cord for any damage (often with early models) and possible replacement - then it is about cleaning the cursor's path on the winding and having lithium grease back on the path - in your case, the metal finger needs probably to be bent A LITTLE so that the contact is better - close the casing and bent the protruding metal to lock it in place WARNING: do not try to open the assembly around the red button and its bass finger. It would be a lost cause, a lost spring Here is mine once opened Cheers Jean Thank you so much, Jean. I have the device open. How would you suggest I clean the cursor path?
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1 user liked this useful post by Lostcajun
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 Joined: 21/12/2012(UTC) Posts: 1,483 Location: Hrvatska
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You say it only works at maximum speed - that would mean you have incorrectly connected the rail leads, yellow and brown, which gives a constant 16 volts (and more). Another, but only theoretical, possibility would be that the wire going to the current collector inside the transformer has come loose and fallen to the maximum speed position (I have never seen that in my 60 years of repairs).
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2 users liked this useful post by 1borna
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