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  #101  
Old 02-08-2023, 10:20 AM
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Quote:
Originally Posted by greywynd View Post
The reason most of us would do them via lineboring is that, once your bearings are setup, it’s a quick switch over to the bore welder that will semi automate welding the bores up.



As to machining them, line bore, milling machine, boring mill, lathe, whatever will turn the tool will work and can be the ‘right’ way to do them.



How much interference did you have between your bores and your sleeve?



This bigger stuff has so much weight being pounded on it that it will wear out the bores, even though they have bearings between the bore and the pins. I hope your sleeves will work, well…they’ll work for a while. I just don’t know if they will get the life that welding would.



Even a lot of the bushings get welded in on the big shovels, often with stainless due to the dissimilar alloys of steel in use. And I’ve seen the bushing fail, as well as the stainless weld, and the bore still need major repairs.


I had about a .001” press fit on a 6.710” bore. I then made the internal bore for bearing about .005” over the nominal 6.250” bearing. I did not want yo have to set back up after pushing the bearing and welding to take a bit out. The internal bore measured about 6.252” when I verified it this morning before installing the bearings.

If you have any other suggestions for the actual press fits numbers I should’ve shot for, please let me know.

The material I used to sleeve it was just a piece of hone tube barrel material I had on the shelf. I probably should use a better grade, but then again I’m not the guy that will stand up and let the boss know we are not doing it totally right, unless it absolutely needs it.

For the most part, I do not think any of these repairs has failed miserably in the past, and I can’t recall having a cylinder come back needing the same repair yet. We do stamp each job going out, so we can look up what we did the previous time it was in for repair.

We have some customers that just abuse their equipment, and they know it. If we can get them another run or two out of a rebuild and save them from buying a new cylinder every time, they are happy.

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  #102  
Old 02-08-2023, 11:54 AM
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I use .001" per inch of diameter for a press fit.
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  #103  
Old 02-08-2023, 11:59 AM
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I’ll see if I can get any specs for those. Do you happen to still have a part number for the bearings?

Swivel bearings are different, but generally Cat uses .001” per inch of diameter on plain bearings/bushings.


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  #104  
Old 02-08-2023, 12:19 PM
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Originally Posted by greywynd View Post
I’ll see if I can get any specs for those. Do you happen to still have a part number for the bearings?

Swivel bearings are different, but generally Cat uses .001” per inch of diameter on plain bearings/bushings.


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The bearings were 8J-8906 CN.
Appreciate the help. My searches have not turned up much in specs, or I am not looking in the right areas.

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  #105  
Old 02-15-2023, 11:30 PM
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Had to make a couple of adaptor bushings to turn a water valve on a water truck for a local excavation company. They need to tie two valves together. My job was to create the bushing with an ablong hole in it to take place of the normal valve handle. They will fab up the steel strap to weld onto it. A bit if lathe and mill work. I did use a 1/4” end mill to widen the ends so hopefully it will fit their valves without much hand filing.

The end mill pic is one that I had hand sharpened the end on. It worked fine plunge cutting. I only cut about 1/4 of the diameter at a time, so take it littler bites.

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  #106  
Old 02-17-2023, 09:41 AM
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Quote:
Originally Posted by toprecycler View Post
Had to make a couple of adaptor bushings to turn a water valve on a water truck for a local excavation company. They need to tie two valves together. My job was to create the bushing with an ablong hole in it to take place of the normal valve handle. They will fab up the steel strap to weld onto it. A bit if lathe and mill work. I did use a 1/4” end mill to widen the ends so hopefully it will fit their valves without much hand filing.

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I noticed the stop you have on the vise jaw. Did you make that or was it bought that way?
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  #107  
Old 02-17-2023, 09:53 AM
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Originally Posted by toprecycler View Post
The bearings were 8J-8906 CN.
Appreciate the help. My searches have not turned up much in specs, or I am not looking in the right areas.

Attachment 167102


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https://aftermarket.express/caterpillar/8j8906
https://propelparts.us/caterpillar-e...sp-8j8906.html

Specifications for part number 8J-8906

Inside Diameter (in): 3.250

Length (in): 4.000 (Inner Bearing)

Outside Diameter (in): 6.250
Weight 20 lb
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  #108  
Old 02-17-2023, 10:18 AM
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Quote:
Originally Posted by Ironman View Post
I noticed the stop you have on the vise jaw. Did you make that or was it bought that way?

That was factory stop. It is attached to the front of the vice when not in use. Took me a couple years to realize what it was, and maybe a video of someone else. I think I was the first one in my shop to know what it was for.

It’s painted yellow to match my color coded Allen wrench holder, so I can quickly grab the right size Allen. Click image for larger version

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  #109  
Old 02-17-2023, 12:33 PM
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https://aftermarket.express/caterpillar/8j8906
https://propelparts.us/caterpillar-e...sp-8j8906.html

Specifications for part number 8J-8906

Inside Diameter (in): 3.250

Length (in): 4.000 (Inner Bearing)

Outside Diameter (in): 6.250
Weight 20 lb

Thanks for checking Gerry.

I looked at those links, but could not find actual specs on that site. Then I checked Cat.com and found the specs you listed.

But the one other spec that I needed as a machinist was the length of the Outer bearing race. This bearing was held in by a snap ring on either side, so I had to have grooves machined just right. Do to the condition these showed up at my shop, I could not determine the original specs. So I had to wait until the actual replacement bearings showed up. The customer provided it.

We have used aftermarket bearings before, and they sometimes do not hold up as long as OEM, so sometimes we just let the customer send us what they want installed.

Usually we try not to machine any parts unless we have the new parts to install in hand, to physically verify dimensions. We have been seeing quite a bit of parts coming in that should not have passed quality control.


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  #110  
Old 02-18-2023, 10:13 AM
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Thanks for checking Gerry.
.

Usually we try not to machine any parts unless we have the new parts to install in hand, to physically verify dimensions. We have been seeing quite a bit of parts coming in that should not have passed quality control.

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That's kind of the way I do things also. If you are doing a press fit and your mic disagrees with theirs, better to use yours from the get go.
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