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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Pins and bushings or new rails?

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Ken Pearson

10-28-2005 22:59:16




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The pins and bushings on my CASE 310c are shot so the question I have is should I have the pins and bushings replaced for about $850 or new rails for about twice the $$? Any pros and cons would be appreciated.

Thanks,
Ken




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MSM

10-29-2005 09:04:47




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 Re: Pins and bushings or new rails? in reply to Ken Pearson, 10-28-2005 22:59:16  
Another consideration is what shape is the rest of the undercarriage in? Putting new chains up against worn rollers, idlers and sprockets,usually causes the new chains to wear prematurely because of the chains trying to seat themselves into the wear patterns of the used parts they run against.At least replace the sprockets,maybe have the idlers welded up,or replaced,and swap the rollers around so the best ones are next to the idler and sprocket.This will give the best life when mixing new with old.

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Roy Suomi

10-29-2005 06:23:28




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 Re: Pins and bushings or new rails? in reply to Ken Pearson, 10-28-2005 22:59:16  
Are the rails good enough to support new pin and bush?? I would rather replace pins and bushings than turn them. Especially on a smaller machine. I've found that turning pins and bushings make the track " snakey " causing the track to run out of alignment with bottom rollers. When this happens, you can expect to loose the track , usually on uneven or swamp conditions. There are guidelines for replacement or repairs, depending on rail wear percentages. The Case dealer should have the wear percentages in a manual for undercarriage appraisal.

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shoe

10-30-2005 17:11:07




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 Re: Pins and bushings or new rails? in reply to Roy Suomi, 10-29-2005 06:23:28  
Turning of pin and bushings are not the reason the
track seems to run one way or another. The problem
is the spocket segments as on caterpillars are wore
according to the rails and rolls. If pins are turn-
ed, new spockets need be replaced and some roller
work done as in build up or replaced. Front idelers
also need rebuilt or replaced. Cheek plates need to come off and wear points built up, and ground down
and cheek plates shimmed to specs. Done this for
a living for a few years .

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Ken Pearson

10-30-2005 11:21:37




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 Re: Pins and bushings or new rails? in reply to Roy Suomi, 10-29-2005 06:23:28  
The rails don't seem worn however I'm new to the tracked machine world so I don't really have anything to base the opinion on. The reason I believe the pins and bushings are shot is because when I had the track apart to replace bearings in the final drive I noticed the track was "snakey" and because the idlers are adjusted all the way out to get rid of slack in the chains.

The teeth on the sprockets are not pointed and don't seem excessively worn and the rollers have good shoulders on them.

What are the indicators that the rails are excessively worn? Should I take some pics and post them for visual backup?

Thanks for the things to consider,
ken

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Roy Suomi

10-30-2005 20:43:30




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 Re: Pins and bushings or new rails? in reply to Ken Pearson, 10-30-2005 11:21:37  
Think about it for a sec. When you turn pins and bushings , you do return the pitch [ length of assembled link ] to original spec...But what happens to the internal wear ?? If you have the track on the floor , off the machine , and you swing the end of the track from side to side , there is considerable slop in the track . This same occurence happens when you run the machine on uneven ground conditions. The only thing that keeps the track in line is the bottom rollers. If some of the bottom rollers are not making contact with the rails on this uneven ground , it will throw a track, unless caught in time..And yes ,I do own my own track press.. As far as knowing when you have roller problems, look on the side of the links where the pin goes thru. There should be little contact with the pin boss [ area around the pin ]. A flat area will be present from the bottom roller making contact with the track link..Flanges have a spec height. The dealer will have specs on that height. They have a percentage of wear chart that will show how much wear is on the rollers . If you don't intend on using the machine a whole lot , I wouldn't spend a lot on undercarriage . Sprockets that aren't sharpened to a point can be reused . But I wouldn't if you change pins and bushings.Again , it depends how much use this machine gets...

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