Lionel GG1 Pullmore motors going crazy

Are you in command or conventional mode when this happens?   What is the power source?

Power source is a Lionel 180 watt transformer and we're running in command mode.  It also does this behavior on the club layout which is using a different power source.

The only thing that comes to mind would be a grounded field coil winding.  If you disconnect the field coil from ground and disconnect the other end from the eunit, there should be no continuity between the isolated field coil and the motor frame. If there is, a field coil turn has probably gone to ground effectively shunting the field.  If this turned out to be the case, either the field coil would have to be rewound or the motor replaced. 

Roger Elliott posted:

HI All,

So my 13 year old son has a Lionel TMCC GG1 loco with Pullmore motors that is very difficult to control.  It is the only engine out of the 6 or 7 that he owns that will drive like crazy on part of his track which is only an 8x5 set of two loops and the other part requires turning up the power to get it to run.  I have had this engine almost fly off the curves near the power supply and then slow to an almost stop on the back side of the layout. I have considered putting in extra power taps in the back of the layout but we change the layout design each time we set up and none of his other engines do this.

Are there better motors that I can swap out?  Where would I get them and what do they cost?

Any help is appreciated.

Thx  Roger Elliott

If this is a early tmcc gg1 green colored. Make sure the magnatractio  magnets haven’t shifted. There was a issue with these units. The performance will be severely hindered.

mcc

This is a common and obvious power issue. Due to the very high current draw of the two Pulmors, available voltage at the far end of the layout can drop excessively due to resistance. Virtually the only practical remedy is to add a second lock-on. Cleaning the track can help too. If the track is tubular, ensure all connections are tight and corrosion free.

Similar problem here, here and here too. Here is a concurrent discussion with similar advice. Further discussion here, here, and here or here. Another discussion here or here. More technical discussion here, here, here and elsewhere...

If this is the 18313 PRR green single stripe, then one, or more, of the magnets has likely become unstaked and is rubbing against a drive wheel.

Solution, after disassembly, is to use a screwdriver to move the magnet from the drive wheel and recenter it, and then use a drop of super glue to hold the magnet in place.

Hope this is you fix,

Fred

shawn posted:

Roger Elliott posted:

HI All,

So my 13 year old son has a Lionel TMCC GG1 loco with Pullmore motors that is very difficult to control.  It is the only engine out of the 6 or 7 that he owns that will drive like crazy on part of his track which is only an 8x5 set of two loops and the other part requires turning up the power to get it to run.  I have had this engine almost fly off the curves near the power supply and then slow to an almost stop on the back side of the layout. I have considered putting in extra power taps in the back of the layout but we change the layout design each time we set up and none of his other engines do this.

Are there better motors that I can swap out?  Where would I get them and what do they cost?

Any help is appreciated.

Thx  Roger Elliott

If this is a early TMCC GG1 green colored. Make sure the magnatraction magnets haven’t shifted. There was a issue with these units. The performance will be severely hindered.

 

I'd do the normal maintenance on the motors, lube, clean the commutator, make sure you have good brushes, etc.  I'm also of the opinion that a contributing factor is likely the power draw and poor power distribution to the tracks.

gunrunnerjohn posted:

I'd do the normal maintenance on the motors, lube, clean the commutator, make sure you have good brushes, etc.  I'm also of the opinion that a contributing factor is likely the power draw and poor power distribution to the tracks.

John,

There was one early TMCC GG1 with the magnet issue. I reglued about 10 of them over the years. I don’t think anyone could believe the effect the magnet shifting had on performance. You might be surprised. Although, It may not be HIS issue. But, it was so bad on the one production run of GG1's. It's worth the mention.