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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Front Idler Wear

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H2

09-13-2007 12:48:53




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How worn can you let the front idler get before you have to repair it? I have a 11B that is worn on one side about 3/8 inch. I have aligned the idler back up per spec and it is tracking correctly. Previous owner must have ran it this way.

Any issues if the track stays on? Will this much wear shorten the life of rails or rollers significantly?




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135 Fan

09-13-2007 22:15:38




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 Re: Front Idler Wear in reply to H2, 09-13-2007 12:48:53  
I've seen idlers with weld beads across them (horizontal, not around the circumference) that may help. You would have to alternate beads opposite each other so the idler doesn't get too hot. A shop that works on undercarrige would be able to give you more info. When they build up worn idlers on Cats they cut a circle out of the hub so it doesn't pressurize from the intense heat of automatic welding and weld the plug back in when the idler cools off. This is done around the circumference but is usually only done on the bigger machines. Roller shells are done as well but I don't think it's as common as it used to be. Check to see if Stoody has info on a web site. Dave

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H2

09-14-2007 06:29:05




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 Re: Front Idler Wear in reply to 135 Fan, 09-13-2007 22:15:38  
Dave,

Thanks for the info. Can you tell me more about welding across the idler? The center rib is worn on one side only. I assume your talking about welding a line perdendicular down the side of the rib to the flat of the idler. If so, how far apart should these be and how wide? Penatration is not an issue so the amp setting would be low?

I guess the welds would wear smooth or should they be ground?

I assume a 7018 rod or should I use a hard facing rod?

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135 Fan

09-14-2007 22:33:25




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 Re: Front Idler Wear in reply to H2, 09-14-2007 06:29:05  
I'm not an expert but you need to make a template of the idler profile so you can see what needs to be built up. You could make one of the other idler? You want your welds to stick so don't turn the machine down too much. 7018 would work but Stoody build up rod or equivelent is a better choice. It's not a full hard facing rod but is used for building up rollers and idlers or building up other parts prior to applying hard facing. Regular Hard facing wouldn't work on idlers or rollers. Build up rod can be done in multi layers where most hard facing is limited to 2 layers. If the welds went on smooth they would wear in. They could also be ground to the right profile if needed. 7018 or build up rod is much easier to grind than hard facing. Automatic built up idlers are left in as welded condition as the welds are very smooth. Check out if Stoody has info on a web page or go to a bigger welding supply like Praxair or Airgas. Dave

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