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 Posted - February 11 2015 : 6:28:23 PM
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I'm trying to assist a fellow hobbyist who has taken apart and reassembled a Tyco GP-20 with a powertorque. He says after he reassembled the motor it now runs in the opposite direction of another loco on the same track...I cannot imagine what he could have done to cause this condition to occur. He says he did not change or resolder any wires. I have never seen two Tyco locomotives run towards each other on the same track while powered by the same transformer...
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Posted - February 11 2015 : 7:19:15 PM
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A friend of mine had some Power Torque locomotives and they ran in the opposite direction from everything else. I suspect it's just the nature of the beast.
Carpe Manana!
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Posted - February 11 2015 : 8:09:48 PM
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I'm more familiar with the MU-2 GPs, but I was thinking ... if he didn't unsolder anything, he may have spun both front & rear trucks 180 degrees ... not sure if that's possible with the PT.
~ Dave
~ Dave
They're ALL toys
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Posted - February 11 2015 : 8:23:47 PM
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I think the front and rear trucks on the GP20 have different designed frames to snap into, so I don't think you could put the power truck into the other position. The coupler pockets are made onto them, so they can only go one way. Well, actually, you COULD mount the dummy truck into the front frame, and vice versa, so it MAY be possible to reverse it. Usually the dummy truck trails I think, and the powered truck is up front with the headlight.
Jerry
" When life throws you bananas...it's easy to slip up"
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Posted - February 11 2015 : 8:32:12 PM
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Any chance he flipped the magnets in the motor?
Randy
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Posted - February 11 2015 : 8:57:15 PM
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Rule of Thumb #4: The least informed people make the most intractable problems. 
--CRC
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Posted - February 11 2015 : 9:01:57 PM
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| I did ask him if he removed the magnets and he said no.
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Posted - February 11 2015 : 9:16:51 PM
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if the power truck is in the long hood portion of the locomotive, that may be the issue.
just me Ray... and just because I have Tyco doesn't mean I am not a model railroader
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Posted - February 11 2015 : 11:25:30 PM
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| I know I have several PTs that run in the opposite direction. Is he sure it hasn't always been like that? I'd say flip the magnets and see what happens. It's been a while since I took a PT apart but I'm pretty sure the gears and brush plates only fit one way. The trucks on the GP-20 also only fit one way.
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Posted - February 12 2015 : 06:18:08 AM
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Only 2 ways to reverse a PT. Flip the magnets in the field or flip the metal pick up wheels that feed the brushes. You can do either to get it to run in the right direction.
frank
toptrain
" It's a Heck of a Day " !!!
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Posted - February 12 2015 : 07:39:26 AM
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Maybe the GP20 is right and the other engine is backwards. May need to look outside the box [engine]!
Regards, John
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Posted - February 12 2015 : 10:55:52 AM
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quote:Maybe the GP20 is right and the other engine is backwards. May need to look outside the box [engine]!
Regards, John
Originally posted by JRG1951Â -Â February 12 2015Â :Â 07:39:26 AM
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try
May need to look outside the box [cab] 
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Posted - February 17 2015 : 12:37:50 AM
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| right rail positive, forward. Move the insulation from the positive brush to the negative and resolder the wire to the insulated brush.
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Posted - February 17 2015 : 4:02:38 PM
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You can't accidentally reverse the wheels on a PT loco because the insulated wheels on the power truck are geared and can't be flipped. The wiring also can't be reversed, because one brush is permanently connected to the PT block by a grounding strap. Flipping the motor brush plate upside-down will reverse polarity to the armature. It's either that, or he's flipped both trucks 180 degrees.
The Tyco Depot
Edited by - NickelPlate759 on February 17 2015 4:18:23 PM
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Posted - February 17 2015 : 11:03:38 PM
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Ah. I was thinking the ones with a armature parallel to the rails...not the pancake motor.
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