Lionel GP9 TMCC Runs At Half Speed

tinplate guyOGR Forum Member

The problem engine is a Lionel's Centtenial GP9 issued in 1997 w/TMCC.
I bought the engine new and have had it for 12 years. Never had a problem.
After sitting for two months, I attempted to run it yesterday.
At maximum throttle, it runs very slow. Going conventional, it runs fast like normal.
With TMCC all features (horn, couplers, lights, sound) work ok.
Both HH performed the same....low speed.
The RESET procedure had no impact on the problem.

Any suggestions welcome.
Tinplateguy

1/5/125:05 PM

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RKOGR Forum Member

Have you checked to see if there's hair & fuzz stuck in the gears and wheels of the trucks?

Is there just 1 motor in there or 2?

1/5/125:49 PM

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GGGOGR Forum Member

What is your source of power? Power Master can have the voltage output limited in Command by operator action, while the conventional mode would have full available. CAn you measure track voltage while operating in this reduced speed state? G

1/5/126:00 PM

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Boxcar BillOGR Forum Member MEMORIALIZED MEMBER

Did you accidently set speed limit(high voltage setting), did you do a
re-program not re-set.

Bill

1/5/126:14 PM

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grazOGR Forum Member DIGITAL SUBSCRIBER

I had the same problem with a lionel TMCC GP-9. It was the UP unit ore train from the late 90's.
Everything worked great but in TMCC mode, it seemed to top at a rather low speed. In conventional mode, it had the full speed range. It was a while ago and I'm pretty sure that I tried to reset the max speed setting, etc but not sure if it helped.
I didn't really find a solution as I upgraded to Legacy control and it allowed the full range of speed compared to my TMCC-1 set-up.

1/5/128:46 PM

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tinplate guyOGR Forum Member

Thank you for your inputs.
The gears are clean and as noted, it runs ok in conventional mode.
KW is the track feed. Full volvtage on track.
I have not done a reprogram or check if maximum speed was accidently set.

Tinplateguy

1/6/1210:31 AM

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tinplate guyOGR Forum Member

I re-enterred the engine ID and it worked.

I did not bother dong this at first because the engine (even though it ran at 1/2 speed), it still responded to the commands.

Thanks for the inputs.

Tinplateguy

1/6/121:10 PM

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