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Idler Weld Build Up

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1 month 1 week ago #232396 by Alexjfrench
I am going to do some weld build up on the idlers and rollers of my D47U.  I will follow the weld build up procedure from Cat but I have a few questions regarding turning them back down.  The small rollers I can turn back down on the lathe although that hard facing might be extremely tough even with ceramic inserts.  My thought was to build a jig on a die plate and use an old surface grinder arbor to grind them back into round.  My front idler would not fit in my lathe anyway.  I would need a gap bed lathe with a pretty good swing to get it in there.  Has anyone ever done anything like this?  Seems like once the jig was built it would be pretty easy.  

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1 month 1 week ago #232405 by bursitis
Replied by bursitis on topic Idler Weld Build Up
no need to turn them down.
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1 month 1 week ago #232409 by trainzkid88
Replied by trainzkid88 on topic Idler Weld Build Up
especially if using abrasicord 600 or 650 it will wear in on its own.
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1 month 1 week ago #232410 by trainzkid88
Replied by trainzkid88 on topic Idler Weld Build Up
the cat roller machine rotates the roller so the bead is concentric to the roller.
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1 month 1 week ago - 1 month 1 week ago #232416 by dpendzic
Replied by dpendzic on topic Idler Weld Build Up
I used 60-13 rod and just ground down any real high spots with my angle grinder

D2, D3, D4, D6, 941B, Cat 15
Hancock Ma and Moriches NY
Last edit: 1 month 1 week ago by dpendzic.

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1 month 1 week ago #232418 by neil
Replied by neil on topic Idler Weld Build Up
I've wondered about that, which is that although it's not required to grind down the weld, there would still be some impact from the high spots hitting the idler surface and the roller surfaces, and I was curious if that impact is material or not?

Cheers,
Neil

Pittsford, NY
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1 month 1 week ago #232420 by d2gary
Replied by d2gary on topic Idler Weld Build Up
Not an apples to apples comparison but I did the track chains and one bottom roller on my d2 and am amazed at how fast the welds find their own level. I've only run up and down the driveway a few times and I can already see the difference. A friend who has done undercarriage work before also says that the weld doesn't just wear off but also gets peened into the low spots. I did grind some of the high spots but unless they are very excessive I probably wouldn't bother with the grinder again.
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1 month 1 week ago #232441 by JackD6-5R
Replied by JackD6-5R on topic Idler Weld Build Up
I have thought about having a strap of steel rolled into a circle the right size to fit the idler then welding it to the idler where the chain runs ,but haven't yet tried it.

D4D D65R D73T 933C HT4 955H Gardner Denver comp.318 Cat.

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1 month 1 week ago #232451 by d2gary
Replied by d2gary on topic Idler Weld Build Up

I have thought about having a strap of steel rolled into a circle the right size to fit the idler then welding it to the idler where the chain runs ,but haven't yet tried it.

I think the problem with this idea is the steel ring has nothing holding it to the idler in the center section of the added on ring. If you plug welded it every couple inches your success rate would be higher.
The weld build up is a tried an true method  although a little labor intensive. 
This is literally not rocket science  and not that hard to do. We are for the most part hobbyists and don't really need this stuff to go back into production,  very different scenarios. 
 

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1 month 1 week ago #232459 by wimmera farmer
Replied by wimmera farmer on topic Idler Weld Build Up
If I can get photos to load here is a front idler from L Twenty that has had some serious repair. All gas brazed together. Some has cracked after who knows how many hours of work. This tractor came from the South Australian mallee area and has had a lot of care with extra shielding made to try and keep sand out of the tracks also other gas weld repairs. Almost no rust on this tractor even on surfaces that were not painted from the factory. Looked at a 2 ton that is coming up for sale front idler tyres on the outside completly gone and inners paper thin worn to death. cheers WF  
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