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3075 Locomotive - only runs at one speed
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Offline roygarren  
#1 Posted : 24 January 2021 19:19:35(UTC)
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roygarren

United States   
Joined: 24/01/2021(UTC)
Posts: 1
Location: Florida, Gainesville
With power on the transformer my 3075 locomotive only operates at one speed and does not respond to the rheostat increasing or decreasing. The rheostat knob does appear to work, because the lights connected to the transformer will dim and brighten with the rheostat movement. Anyone know how to fix this problem? Thanks!
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Offline DaleSchultz  
#2 Posted : 24 January 2021 19:22:28(UTC)
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DaleSchultz

United States   
Joined: 10/02/2006(UTC)
Posts: 3,997
spring on the reversing mechanism inside the loco may be missing.
Dale
Intellibox + own software, K-Track
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thanks 1 user liked this useful post by DaleSchultz
Offline Crazy Harry  
#3 Posted : 24 January 2021 21:32:54(UTC)
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Crazy Harry

Canada   
Joined: 18/11/2008(UTC)
Posts: 477
Location: Oakville, Ontario
Originally Posted by: roygarren Go to Quoted Post
With power on the transformer my 3075 locomotive only operates at one speed and does not respond to the rheostat increasing or decreasing. The rheostat knob does appear to work, because the lights connected to the transformer will dim and brighten with the rheostat movement. Anyone know how to fix this problem? Thanks!


I hope I'm not insulting you, but it seems you may have the yellow and red wires mixed up. Red and brown are track power and react to the rheostat and yellow and brown are constant voltage for the lights and accessories.
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Offline river6109  
#4 Posted : 25 January 2021 00:56:32(UTC)
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river6109

Australia   
Joined: 22/01/2009(UTC)
Posts: 14,712
Location: On 1965 Märklin Boulevard just around from Roco Square
Originally Posted by: Crazy Harry Go to Quoted Post
Originally Posted by: roygarren Go to Quoted Post
With power on the transformer my 3075 locomotive only operates at one speed and does not respond to the rheostat increasing or decreasing. The rheostat knob does appear to work, because the lights connected to the transformer will dim and brighten with the rheostat movement. Anyone know how to fix this problem? Thanks!


I hope I'm not insulting you, but it seems you may have the yellow and red wires mixed up. Red and brown are track power and react to the rheostat and yellow and brown are constant voltage for the lights and accessories.



but if he's done this the lights wouldn't go brighter or dimmer

John

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Offline Crazy Harry  
#5 Posted : 25 January 2021 01:09:27(UTC)
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Crazy Harry

Canada   
Joined: 18/11/2008(UTC)
Posts: 477
Location: Oakville, Ontario
Originally Posted by: river6109 Go to Quoted Post
Originally Posted by: Crazy Harry Go to Quoted Post
Originally Posted by: roygarren Go to Quoted Post
The rheostat knob does appear to work, because the lights connected to the transformer will dim and brighten with the rheostat movement.


I hope I'm not insulting you, but it seems you may have the yellow and red wires mixed up. Red and brown are track power and react to the rheostat and yellow and brown are constant voltage for the lights and accessories.



but if he's done this the lights wouldn't go brighter or dimmer

John



Agreed John, but I read it as other lights hooked up to the transformer not the locomotive lights. Will have to wait for clarification from the original poster.

Harold
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