MTH N&W 611 #1105

Not sure it is there but have you tried ... mthpartsandsales.com.

At one point, perhaps over 20 years ago, MTH did publish spiral-bound books of parts diagrams for RailKing and Premier locos.  I'm not sure whether your 'J' was in them, or how easy it would be to find one of these guides today.

I suggest that you carefully check around the wheels.  A rubber tire can come off and jam the wheels.  A driving rod screw can loosen, allowing a rod to contact another rod or prevent the wheels from turning.  If the loco derailed and fell from the table, something could have gotten bent.

If you're comfortable taking the shell off, turn the flywheel slowly by hand.  Look at the driving wheels from the side, and see whether the binding occurs at the same position every time.  Good luck, hope you're able to get it running smoothly again.

@Ted S posted:

At one point, perhaps over 20 years ago, MTH did publish spiral-bound books of parts diagrams for RailKing and Premier locos ...

Thanks for the reminder Ted.

      2015 Premier Steam Locomotive Parts Guide, First Edition | MTH Electric Trains

Unfortunately it's not all-inclusive, but the GS-4 diagram, being a 4-8-4, may be similar to your 'J' and may help you.

Mike

TY for all offering your input,I have done all the recommended trouble shooting already,turning the flywheel by hand worked once than back to the"binding issue".It does appear to happen in the same spot everytime.I will repeat this process to help eliminate needless tinkering.And no luck yet locating exploded diagrams,the age of this loco seems to make it difficult to access.Navigating MTH parts and service has yielded no results...yet.I do have a trusted train repair person nearby that usually can help,of course I would like to continue to learn repairs myself.TY Ted S for a few detailed troubleshooting tips.

@Mellow Hudson Mike posted:

Thanks for the reminder Ted.

      2015 Premier Steam Locomotive Parts Guide, First Edition | MTH Electric Trains

Unfortunately it's not all-inclusive, but the GS-4 diagram, being a 4-8-4, may be similar to your 'J' and may help you.

Mike

Good find, I had no idea that existed.Thanks.

Does this have the piston smoke unit?  You need to check mechanically the piston is not binding.  Also check all the linkage for bends, and quartering.  G