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Track pin coming out?!

CM1995

CM1995

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DMiller said:
If were OE rails at around 4000-5000 hours depending on materials aggressive qualities they were worn to limits.
Click to expand...

We were able to get close to 7K hours on original UC on our 2011 321DL. Now it was shot when we replaced it.
 
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suladas

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CM1995 said:
We were able to get close to 7K hours on original UC on our 2011 321DL. Now it was shot when we replaced it.
Click to expand...

I have 9500 hours on my 08 EC210C original UC and still going strong, only touched the idlers, neither were worn much at all just shot bushings. I was going to take a good look at it and see if I should do the UC this winter, but I don't think it needs it. I bet I get at least another 1000+ hours out of it, which is at least 2-3 years for me. Original owner idled it a fair bit as do I, working hours are under 7000 though.
 
farmerlund

farmerlund

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John C. said:
One of your photos show a sprocket which is at the back of the track frame. The big ends of the links are looking back at the sprocket and should be looking forward at the idler instead.
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Does it make a differance on an excavator? I can understand on a dozer, with the single grouser. But how about the smoother pad on an excavator. I am not being a smart ass, just curious about your thoughts on it
 
John C.

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Depends on what the excavator is used for. Shovel loggers used to only go about 3,000 hours but most of the manufacturers built them with bigger components. Land clearing machines that do more traveling than digging usually go around 5K or more. Underground utilities machines go a lot longer. Generally most all the excavators will do two sets of chains and sprockets to on set of idlers and rollers.

Dozers are generally in the 3 to 4K range.
 
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oarwhat

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John C. said:
Looks like you have pins working out on both sides. Judging from where the idlers are and the condition of the links, I'll guess that someone cut a link out of each side to make the chains run longer. The last photo shows the correct direction of the chains.
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I'm no expert but that undercarriage is shot. I'd tack weld all the pins and run it to destruction.
 
John C.

John C.

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Welding pins won't make any difference at all. The type of steel doesn't lend itself to welding and will crack in no time at all. If they are moving, you have limited time to replace the chains.
 
CM1995

CM1995

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John C. said:
Welding pins won't make any difference at all. The type of steel doesn't lend itself to welding and will crack in no time at all. If they are moving, you have limited time to replace the chains.
Click to expand...

X2 - I've seen us do it only to have it very quickly fail.:D

Really only two ways to fix it, press in new master links and run it or replace rails and segments. On our 321 we pressed new master links on one side to get us through the busy summer season then we replaced both rails, links and pad bolts that winter.

The only reason why it made $$ sense to press in new masters on one side was we needed the machine to be running and it was cheaper than rental + shop labor to install new rails. We replaced the rails ourselves.
 
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Bluox

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farmerlund said:
Does it make a differance on an excavator? I can understand on a dozer, with the single grouser. But how about the smoother pad on an excavator. I am not being a smart ass, just curious about your thoughts on it
Click to expand...
I had a customer that had a big Link Belt that had one track on right and one on backwards, ran that way 5 years didn't seem to make much difference.
Undercarriages are affected by a vast number of conditions that affect wear rates and life.
What one machine gets the next one may be twice or half as much.
The difference in the last 50 years is kind of mind boggling.
Bad Bob
 
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