wensleydaledownunder

Thanks for the replies and advice. I've had a closer look and yes, the white nylon or plastic gear is split. I can actually slide it off the armature with my fingers it is that loose. Answers the question as to why. It has 11 teeth, so looks like I can order a brass replacement, which sounds like the best solution.

Help! I have a collection of 00 gauge locos and no layout. Every xmas I run a 2nd radius circle around the xmas tree and run a train on it. Last year was a Hornby duchess with tender drive. After a couple of weeks, the motor started to spin with no progress. I assumed some tree debris had clogged up the mechanism and packed it away to service at a later date. This year, I ran my old Hornby 60103 tender drive A3. Serviced it first an the same thing occurred. Pulled the tender apart and found the little white nylon gear on the motor shaft was not gripping the shaft. How can I secure this? Interestingly, an even older Hornby Evening Star bought second hand over 20 years ago and never used has been brought in as substitute and after a quick service runs faultlessly! The difference appears to be a brass gear instead of the nylon one. Thanks in anticipation