30-11012 O gauge RR Crossing Gate Troubleshooting

You should be able to stop the flashing by turning inward the screw labeled "gate top adjustment" in the following photo.

Photo is from this previous OGR thread which includes a component-level schematic of the crossing gate electronics for those curious exactly why a mis-adjusted screw will cause the flashers to flash when the gate is in the up position.

Separately, in re your broken gates parked in the down position, it's more than likely you have a cracked spur gear on the motor shaft.  This is a well-documented failure mode with several OGR threads.

Also, I have three that needed a drop of superglue on the motor shaft because it was spinning in the gear. Working on them is not easy with big fingers.

Thanks for the great info and references, @stan2004 , @John H, @Ponz, @dkdkrd, and others also on the previous thread mentioned.  I've got a lot of reading and tinkering to do, but very encouraged, thanks!

Unfortunately the small plastic drive gear splits, and becomes loose.   As  mentioned, a fix is to super glue the gear, to the shaft, though, IMO, not a long term fix.   Best wishes with your project.  

Mike CT posted:

Unfortunately the small plastic drive gear splits, and become loose. As mentioned, a fix is to super glue the gear to the shaft, though, IMO, not a long term fix.   Best wishes with your project.  

...And, as mentioned in several posts on this accessory through the past few years, the other 'fix' for the split gear is a brass replacement by Northwest Shortline (NWSL), p/n 37410-6.

KD