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D2 going in the shop

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1 year 10 months ago #211806 by Rome K/G
Replied by Rome K/G on topic D2 going in the shop
Okee doakee! lol

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1 year 10 months ago #211908 by d2gary
Replied by d2gary on topic Question for Neil
Did you ever decide what to do with your pivot shaft and bushings. I'm getting closer to that part of my rebuild and am not sure which is going to be the best option.
A couple of ideas I have and havent checked on prices yet.

New shaft to be made with matching bushings. Shaft material and machining would probably be $$$$

Turn the old shaft down to clean up the wear and fit new bushings and try to get a seal that would fit the frame housing and new shaft dimensions. We did check the shaft hardness with a file and does seem like it would be able to be machined.

I'm not real familiar with spray metal welding but it might be worth a look because everything could be put back to spec and no special seals or bushings would be needed.
I have found some stock bushings that are close to correct size for about $50 each

I did a little checking on use some kind of composite material for bushings but haven't really been able to find anything I'm happy with.

Appreciate any thoughts on this from anyone in the know but I know Neil is close to this also.
Thanks

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1 year 10 months ago #211910 by neil
Replied by neil on topic D2 going in the shop
Hi Gary,
my plan is to take the shaft to the machinist, turn it down true, then build it back up (not sure how they're planning to do that but I'm guessing spray metal), and then fit regular size bushings in the track frames (which may be Cat parts or may just be made from stock). The wrinkle in my setup is that the recess for the inner seal is rusted away so I need to come up with a way to refurbish that. I'm thinking to turn a piece and then weld it in and ream to the correct size for the seal which is just a CR of some description.
The machinist thought that once he gets it in the lathe, he can figure out whether to continue with the worn shaft or turn a new one. I think fixing up the old one will be more cost effective because he won't have to mess with the locating holes or the threaded holes in each end. "All" he has to do is turn it down, build it up, and turn it down again. I can take care of the bushings if I buy them from Cat. Just need to put them in the freezer and then tap them in. If they need reaming after fitting, the machinist can take care of that.
Thanks for reminding me though I better get on to it or I won't be ready for spring! : )

Cheers,
Neil

Pittsford, NY

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1 year 10 months ago #211936 by 8C 361
Replied by 8C 361 on topic D2 going in the shop
Many years ago I refurbished a D2 5U pivot shaft in the barnyard. It was grooved maybe 3/8" deep. I built it up with 6013 and ground it back to spec with a hand grinder. New bushings were available from Cat affordabiliy back then. I used a new bushing slipped over the shaft to determine fit. Finished with emory cloth.

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1 year 10 months ago #211937 by d2gary
Replied by d2gary on topic D2 going in the shop
Thanks Neil, sounds like we're on the same page I just need to do a little more checking. I'm by no means an expert welder/fabricator but the inner seal ring should be an easy fix.

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1 year 10 months ago #211938 by d2gary
Replied by d2gary on topic D2 going in the shop

Many years ago I refurbished a D2 5U pivot shaft in the barnyard. It was grooved maybe 3/8" deep. I built it up with 6013 and ground it back to spec with a hand grinder. New bushings were available from Cat affordabiliy back then. I used a new bushing slipped over the shaft to determine fit. Finished with emory cloth.


Thanks for the thought, the barnyard method is definitely something that I have discussed with some knowledgeable friends and is still a possibility. My Caterpillar funds are definitely squeaking but if the lathe turn method only costs me an arm I'll probably go that route. I dont have to many more major parts to fix or purchase, but everytime I think I'm sailing in smooth water a big wave comes up!

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1 year 10 months ago #211939 by neil
Replied by neil on topic D2 going in the shop
I need to ask my parts guy how much the bushings are unless you know?

I still have all of the undercarriage to refurbish:
- fix up the front of the track frames like you did / replace the worn / bent part
- make a new pedestal for the carrier rollers
- make the new mounts for the new rollers
- find another sprocket that's not worn in the splines and fit my new sprocket rings
- find or replace the "slicks" pads
- the pivot shaft and bearings
- make new mounts for the track frame covers
- refurbish the idlers and replace the idler brackets with good - mine are all seized up and I'm running out of fortitude to fix them : )

I don't have a shop so I have to hack away at this stuff in a piecemeal fashion unfortunately but I will farm some of it out so that will get it done faster than if I did it myself. One thing I wanted to figure out is whether I can fit 5 D3 rollers on my current frames, possibly by giving up some idler retraction

Cheers,
Neil

Pittsford, NY

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1 year 10 months ago #211940 by d2gary
Replied by d2gary on topic D2 going in the shop
Finally got all the pieces for the lower rollers collected and repaired. After the bushings were cut to length there's enough left over with the cut off pieces to make one bushing. I had to buy 3in bushings and only needed 2in for the rollers.

Got a good start on my canopy but ran out of material. What I have done is 36feet of tube and it looks like I'm going to need another 20 feet to finish.


Attachments:

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1 year 10 months ago #211941 by d2gary
Replied by d2gary on topic D2 going in the shop

I need to ask my parts guy how much the bushings are unless you know?

I still have all of the undercarriage to refurbish:
- fix up the front of the track frames like you did / replace the worn / bent part
- make a new pedestal for the carrier rollers
- make the new mounts for the new rollers
- find another sprocket that's not worn in the splines and fit my new sprocket rings
- find or replace the "slicks" pads
- the pivot shaft and bearings
- make new mounts for the track frame covers
- refurbish the idlers and replace the idler brackets with good - mine are all seized up and I'm running out of fortitude to fix them : )

I don't have a shop so I have to hack away at this stuff in a piecemeal fashion unfortunately but I will farm some of it out so that will get it done faster than if I did it myself. One thing I wanted to figure out is whether I can fit 5 D3 rollers on my current frames, possibly by giving up some idler retraction


I haven't checked with Cat on availability but I did do some checking on the internet and found stock bushings that would need some minor turning for around $50 a piece.
Just going from memory I'm going to say there's not enough room on the track frame to add the extra roller without stretching the frame.
I'm going to have 2 extra sprockets with good hubs, but the shipping costs might be $$$. I would cut the teeth and ring off to save weight if you get desperate. If you have new rings a wire out d2 sprocket shouldn't be to hard to find

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1 year 10 months ago #211953 by neil
Replied by neil on topic D2 going in the shop
I'm sure I can find a couple over here but thanks for the offer Gary. I have a 4U back end I bought from Ron Meeder, which, if the sprockets are the same, would probably work. If I'm extra lucky, I might even have good percentage left in them. I'm betting those $50 bushings might be a lot more affordable than Cat. Could you let me know your source and the dimensions please.

Cheers,
Neil

Pittsford, NY

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