New chains popping on D3

[lantraxco]

D4K, D3K, D4G, D3G, D4C, D3C SEALED AND LUBRICATED TRACK
LARGE STEPPED BUSHING
36 SECTION: STD (D3, D3B), LGP (D3)
37 SECTION: STD (D3C/B, D4B), LGP (D3C), SPL (D3B)
39 SECTION: STD (D3C/B, D4C), LGP (D3G, D3C/B, D4C, D3), XL (D3G/C)
41 SECTION: XL/LGP (D3K), XL (D4G/C), LGP (D4G))
43 SECTION: XL/LGP D4K
6.125" (155.6 mm) PITCH - 9/16" BOLT

D3C/B, D4C/B, D3 SEALED AND LUBRICATED TRACK
36 SECTION: STD (D3, D3B), LGP (D3)
37 SECTION: STD (D3C/B, D4B), LGP (D3C), SPL (D3B)
39 SECTION: STD (D3C/B, D4C), LGP (D3C/B, D4C, D3), XL (D3C)
41 SECTION: D4C (XL)
6.125" (155.6 mm) PITCH - 9/16" BOLT

D3 SEALED AND LUBRICATED TRACK
FORMER, STRAIGHT WALL BUSHING, SPLIT MASTER LINKS
6.125" (155.6 mm) PITCH -- 9/16" BOLT


D3G, D4G, D3C, D4C, D4B, D3B, D3 SEGMENTS
(USE WITH LARGE STEPPED BUSHING)

(PER SIDE) QUANTITY PART NUMBER
Sprocket Segment (Tough Steel) (5 Tooth) 5 190-7396
Adapter Ring 1 6Y-5499
Bolt 25 9W-9265
Nut 25 8H-5724
Washer 25 5P-8245


D3C, D4C, D4B, D3B, D3 SPROCKETS FORMER MODEL
(PER SIDE) QUANTITY PART NUMBER
Sprocket Assembly (25 Tooth) 1 8Y-0622
Rim (25 Tooth) 1 6Y-1244

 

[Old Magnet]

Do you have any info that says the busing O.D. is different than 1.85"? I don't.

 

[lantraxco]

From the Caterpillar-Custom-Track-Service-Handbook, 15th Edition, the following bushings are used for 6.125 pitch D3:

Straight Bushings 1.95"

Small Stepped Bushings 1.97"

Large Stepped Bushings 2.13"

I couldn't find my book, finally found one online to look at.

 

[Old Magnet]

OK, thanks. My info is not that late.
When I looked on line I still see 1.85" dia. for SALT tracks with straight bushings.

Looks like this case has some miss matched components as previously mentioned.

 

[Old Magnet]

I'm a little slow but still digging. When I went locking for sprockets they all seem to be the same except it does state as you previously mentioned. "Large stepped bushings are to be used with 190-7396 segments and 6Y-5499 adapter ring". I suspect they have a different pitch diameter to accommodate the 2.31" bushings.
I'm still looking for sprocket dimensions. Do you have that info?

 

[lantraxco]

OK, thanks. My info is not that late.
When I looked on line I still see 1.85" dia. for SALT tracks with straight bushings.

Looks like this case has some miss matched components as previously mentioned.

It's crazy, I think you can still get all three, plus the old sealed tracks with 1/2" bolt holes. Not to mention a System One track!

 

[Old Magnet]

Dimensions might be available under Cats "Undercarriage Information System" but it tells me I must have windows 7 to access. Can somebody have a look see that has later computer operating system?

 

[Willie B]

I told you I spent the night at Holiday Inn Express! On a sidetrack, does anyone have a good way to get rid of bed bugs?

 

[lantraxco]

I told you I spent the night at Holiday Inn Express! On a sidetrack, does anyone have a good way to get rid of bed bugs?

In my younger days I would just give them a peck on the cheek and bus fare....

 

[JDOFMEMI]

.......
If the former link groups were fitted with 1.85" diameter bushes and the new one are fitted with 2.1" diameter bushes then unless the new sprockets that were installed have a slightly larger pitch circle for the teeth (unlikely) thus slightly increasing the pitch,.....

I think we are saying essentially the same thing, but saying it differently. One way or another, the sprockets and bushings are not matching one another.

 

[Willie B]

I got to wonder about what is now damaged?

 

[lantraxco]

I got to wonder about what is now damaged?

Probably hasn't hurt anything yet, just needs to be addressed before it damages the finals I would think.

 

[8k bill]

Some of the crap coming out of Asia at the moment is shocking. I wouldn't be surprised if you got a tape out and measure across the tips of the sprocket you'd get different numbers, fairdinkum the stuff I've seen you would only use for net weights. I guess it's the old saying ,you get what you've paid for. But it does look like a mismatch chain and sprocket tho. Bill.

 

[Old Magnet]

I think we are saying essentially the same thing, but saying it differently. One way or another, the sprockets and bushings are not matching one another.

Agreed. It would be nice to know what the actual dimensions are. Plenty of specs on the rails but sprocket specs seem harder to come by. I do have specs for the old 1.85" bushing sprockets and rings but would like to add the new info.

 

[Nige]

OM, if you have the sprocket dimensions for the 1.85" bushing link groups those dimensions might be very useful to the OP because if his sprockets conform to the same dimensions then logically said sprockets could not work with 2.1" bushing link groups because there would not be sufficient space between the teeth to accommodate the larger diameter bushings.

 

[Old Magnet]

OK, here is what I have on the old stuff.

 

[Old Magnet]

Any luck logging in to https://ucis.cat.com/

 

[pineywoodsman01]

The shop is replacing the chains with my previous dimension bushing, the manager tried to talk me into sending it back my cost and looking at other possible causes, but that was not going to happen, another guy there was telling me someone might have changed the rails and they would look at that also, they were going to do it at their cost if it was related to any fault of theirs but it sounded like a deep hole to me, my old chain was worn out, not yet to destruction, and I didn't have this issue then, I was sure the bushings were the issue and from what I've read here, you knowledgeable guys just reinforce my opinion.

Next parts (hopefully not soon) will be factory, not after market even though they are very pricey, at least it will last and work correctly, next week I should be running and I'll let everyone know how it goes, here's a picture I took today, a top view with pads removed, the bushing alignment to sprocket.
I guess I could have gotten new sprockets but it was a real trick getting them off and on here at home and I don't want to repeat it.

 

[tctractors]

The Sprockets are pressed on I have done a few of these tractors, its a shame this re-track job has not worked well for you, the large bush chains look very good and would have been a great choice to have kept.
tctractors

 

[Truck 505]

Make sure whoever bolts the pads back on gets the paint off of the top of the chain where the pad sits.
If they don't, the pads will come loose.