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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Case 450B - track repair ?

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David in SC

05-09-2004 17:45:31

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I have not seen any Case questions posted lately, so I felt obligated to write one. I am still tinkering with small, low cost fixes on my machine; somehow avoiding the much needed engine rebuild and U/C replacement. As of yet, the closest thing I have done to work is taking the machine out back and digging 2 scoops of dirt and it did that OK. But, I am cautious about throwing alot of money out at this point. I have some questions about the U/C that you all sure could help with. They include:
1) Previous owner apparently broke track and welded one link back together to repair. Distance between pin center is 6.125" all around both tracks except for the welded link which is 7.00". Whew, not even close, and must have used 20 rods to do it. Now, each time this area engages the sprocket, it wont seat so the whole track gets tight, then slack again when it comes off. I assume it is useless to replace sprockets without addressing this obvious issue. Does anyone have a link they would like to sell me at a reasonable price? I have found a dealer with a track press. I assume this is the correct repair? If not, please let me know where I am wrong. I hate to cut the weld and try to re-weld, but I will if that will work.
2) How do you all feel about welding rebar to the pads? Pads on this machine are smooth and thin, but I figure chains have a little life left in them; not enough though to justify new pads. Bolts on one side are loose, every one of them. This would be a good time to pull them up and weld them to. Then,one day I could scrap the whole assembly and feel like I used it all up.? 3) Both final drives appear to leak. Is this leak a big deal? They only leak down a little and the bottom half of the bull gear is still submerged. I wonder what this welded link is doing to my final drives; probably killing it. How hard is it to correct this leak? Manual does not make it look difficult.

Anyhow, those are my issues that I face right now. Any advice is much appreciated. My plans are to hopefully get that track repaired and then put on new sprockets and top and bottom rollers as it is all shot.

Thanks as always for the good advice!
David in SC

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John Van Valkenburgh

05-11-2004 03:31:52

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 Re: Case 450B - track repair ? in reply to David in SC, 05-09-2004 17:45:31  

I have an older Case 450 so I don't know if this applies to you or not, but I was told to keep an eye on the oil level in the front idlers. Each one has a plug that unscrews. These are often overlooked until it is too late.

How bad are your Growser pads? I did not know until fairly recently that the growser pads on a crawler are not as tall as those on a dozer. They might not be as bad as you think.

Best of luck,

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05-12-2004 14:34:37

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 Re: Re: Case 450B - track repair ? in reply to John Van Valkenburgh, 05-11-2004 03:31:52  

I recently replaced one of the two idlers on my 450. The other was just replaced. I did notice the fill hole you talked about and wondered if oil or grease went in there. What type of oil does this use and do you have any ideas as to how ofter this should be checked. Although I got a Berco idler out of Canada for cheaper than I could in the states I would rather not change either one again.


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John Van Valkenburgh

05-12-2004 15:49:09

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 Re: Re: Re: Case 450B - track repair ? in reply to Alex, 05-12-2004 14:34:37  

I seem to recall that the manual calls for 30 wt. engine oil for the front idlers. I'll have to go back and check the manuals. Unfortunately I don't have them here at work. The idlers are turned so that the plug is facing up and then simply fill it.

A friend of mine mentioned that the oil for the idlers is usually ignored until too late and he cautioned me to keep an eye on them. Likewise he mentioned that I should keep an eye on the gear oil in the final drive cases.

Both my idlers seem to be okay. I'd rather not change one either.


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05-09-2004 19:43:49

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 Re: Case 450B - track repair ? in reply to David in SC, 05-09-2004 17:45:31  
David, I am not an expert by any means, but I'll give you my two-cents worth. (1)The welded link probably wouldn't bother me at all if it were put together properly. I have done a lot worse trying to get a machine back to the shop, but I always fixed it as right as I could immediately after. As far as putting a used link in it, I would think that it might not be a good idea because of the difference in wear. I would probably weld it instead. (2)As far as welding rebar to the grousers, I don't recommend that at all. Rebar, as a general rule, is not very hard. It can get very brittle around a weld. I've seen it used before, but it usually broke off in pieces after a short while. Most steel yards, and even some equipment dealers, can get grouser bar stock. It is usually made of T-1 or AR360, it wears very well, and it welds very well with either low-hydrogen or a wire feed. It is usually not all that cheap, but I think it is well worth the cost. It really depends on how good your pads really are, and if you want to try to refurbish them or replace them. (3)Do the final drives just make a wet spot for dirt to collect, or do they actually make a large drip or stream? If they just wet enough for dirt to stick, I would just check them periodically. My HD3 Allis Chalmers leaks like that out of both finals. One I have not touched, but the other I have completely rebuilt (bearings, seals, and oil pan gaskets). I know that nearly all the old Cat crawlers I was ever around had damp finals. If they leave big puddles overnight, I would tear them down and rebuild them. Usually when a seal gives up, it is not from dry-rot, it is from being hammered out because of wear to the parts it is to be sealing. I'm not familiar with the Case machines, but it can't be too bad a job. Like my grandpa used to say,"If someone was smart enough to make it, I ought to be smart enough to fix it." As far as the odd link, it is probably not doing any favors for that final. That is what I would attend to first. Hope this helps. Good Luck!!!

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David in SC

05-10-2004 18:58:35

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 Re: Re: Case 450B - track repair ? in reply to Dale, 05-09-2004 19:43:49  
Excellent advice to all my posted concerns! Thank you very much.

David in SC

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