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If this is for the re-issue gantry crane with the two can motors with the large plastic transmission case (has a metal worm gear, plastic or nylon gear and the belt inside) I just serviced mine by removing the original gummed up grease, replacing with Lucas Red 'n Tacky, and using a 1-3/16 x 1-1/16 x 1/16 #26 O RING from a local ACE hardware.

 

I just did this a month or so ago and have not used the crane very much - so I can not comment on longevity, etc.  I did test the unit after re-assembling and all worked well.

 

- Luther

Good tip Luther. How much did you have to stretch the O ring? Its possible with minimal stretch, that O ring might last quite a few years but I have found that the common Buna N O rings you find in auto and home stores don't last very long if they are stretched to any degree. If you need an O ring that will be used as a drive belt a better material is polyurethane. An O ring, oil seal specialty store will have them or you can get them from McMaster Carr. The dimensions you give are Part #9558K61 for a Polyurethane O ring. Likely will cost considerably more though.

 

http://www.mcmaster.com/#o-rings/=ijqnsy

 

Given the price I suspect Lionel is using Buna N (aka nitrile).

 

Pete

Originally Posted by Norton:

Good tip Luther. How much did you have to stretch the O ring? Its possible with minimal stretch, that O ring might last quite a few years but I have found that the common Buna N O rings you find in auto and home stores don't last very long if they are stretched to any degree. If you need an O ring that will be used as a drive belt a better material is polyurethane. An O ring, oil seal specialty store will have them or you can get them from McMaster Carr. The dimensions you give are Part #9558K61 for a Polyurethane O ring. Likely will cost considerably more though.

 

http://www.mcmaster.com/#o-rings/=ijqnsy

 

Given the price I suspect Lionel is using Buna N (aka nitrile).

 

Pete

I perceived the stretch as minimal at best.  Being round the replacement o-ring rolled right on to the pulley.  It did not pull the pulley out of alignment with the top bearing hole during reassembly, etc  I tested the length by stretching the original with two jewelers screw drivers until just snug and then trying to slide different size o rings over the same two screw drivers (a third hand would have been helpful ).  I also tried a 1 1/4 o-ring but it was a little too loose.

 

Thanks for the info on the different o-ring materials - I was not aware that there were different types.  On my next accessory rebuild (this transmission is used in a lot of re-issues including the 497, 415 and  352) I may try the polyurethane.  Getting the plastic tabs separated on the casing is a little tricky and not something I would like to do frequently.  Designing the piece with two or three small screws would have made disassembly so much easier.

 

The McMaster-Carr site shows that the Buna N rings also come in a square profile which is what the original Lionel item is - I agree that the originals may be nitrile.

 

- Luther

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