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Tractor Talk Discussion Forum

what does it mean?

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Dave

04-19-2004 10:39:01




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What do they mean when they advertise crawlers and the ad state something like (The undercarriage is 80%) just curious to this.
Thanks Dave




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JMS/MN

04-19-2004 21:52:46




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 Re: what does it mean? in reply to Dave, 04-19-2004 10:39:01  
It refers to (80%) how close to new it is- just like saying a wheeled tractor has 80 per cent rubber left on the rear tires. They are referring to the condition of the tracks and rollers of the crawler. 80% is 20% worn out.



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Larry NE IL

04-19-2004 16:18:56




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 Re: what does it mean? in reply to Dave, 04-19-2004 10:39:01  
Adding to the other replys; You can measure the wear on your undercarrige if you have the original spec. The chain is the most expensive and is measured for stretch by the distance between the pins. Stretch is a sign of worn bushings in the chain. The telltale signs to check when doing a prelim. inspection are; feel surface of the pins by reaching up in the middle of the chain. New chain pins will be round. If you feel a "flat spot" on top and bottom of chain, then the pins and bushings have already been turned and the only option is to run them to junk.(+$$) Flat spot on one side and the p&b can be turned and used quite a while.($) Sharp, pointed drive sproket teeth are worn out. But new ones are not too costly. If the chains have been pulled up real tight, watch out, some one is trying to pull a fast one on you. Some things that put undue wear on an undercarrige, excessive speed, tracks too tight, sandy/rocky ground, operating the machine for long distances in reverse and turning in the same direction most of the time.
Rollers and rock guards are obvious. To check idlers, run the machine back and forth, watching for side movement of the front of the track. That indicates worn bushings in the idler.Larry NE IL

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kyhayman

04-19-2004 14:06:12




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 Re: what does it mean? in reply to Dave, 04-19-2004 10:39:01  
Most people that use it, use it as an estimate of new. Technically it is the % wear off of new in proportion to the replacemtn point. Most I have seen with a supposed 50% are already beyond the replacemtent point. If you want to see some good (and correct) examples go to ironplanet (one word, preceeded by the usual stuff and ended with com). They have all the specs on each item when it sells in actual measuement and % if the manufactorer publishes it.

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buickanddeere

04-19-2004 20:38:20




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 Re: Re: what does it mean? in reply to kyhayman, 04-19-2004 14:06:12  
Do you have a link to that part of the iron planet site? Couldn't find the definitions of undercarrage wear.



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buickanddeere

04-19-2004 14:03:03




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 Re: what does it mean? in reply to Dave, 04-19-2004 10:39:01  
Anyone here ever try prying the tracks back onto a crawler in the middle of a muddy swamp when filled with tree roots and dirt?



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DW

04-19-2004 14:15:27




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 Re: Re: what does it mean? in reply to buickanddeere, 04-19-2004 14:03:03  
Sounds like the manure pile was not so bad after all. ( AC HD5G less than 50% )



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Ray

04-19-2004 13:26:24




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 Re: what does it mean? in reply to Dave, 04-19-2004 10:39:01  
That's supposed to mean the condition of the
under carriage,Chains,sprockets,rollers,the
expensive stuff to fix.100% is new.The problem is
most people who tell you there under carrage is
80% usually have 50% or less.



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txblu

04-19-2004 12:11:49




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 Re: what does it mean? in reply to Dave, 04-19-2004 10:39:01  
all the rumbling goodies under the thing that are in the mud all the time with 10 million grease zerks, and covers you have to take off to get at the zerk, and the tread wearing off



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polk crawler

04-19-2004 10:47:26




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 Re: what does it mean? in reply to Dave, 04-19-2004 10:39:01  
% of undercarriage on a crawler will produce a lot of opinions and judgments but a good question. I can't answer but get into the Crawler
discussion board, lots of guys with years of experience as mechanics, owners, skinners...they can tell you. Less percentage stated on the undercarriage means the rig is a money pit and it will cost you mega bucks to rebuild and repair. Good luck and its lots of fun.!
PC

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