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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Undercarriage Question From a Newbie

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Nathan in Ohio

11-25-2005 12:30:49




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Hello! I do not own a crawler but am very interested in them. I always see "undercarriage" and a % in most crawler ads. What exactly is the undercarriage and what wear is indicated by the %??? When I was in the Army, my job was Track Vehicle Mechanic. I think that the Army's track setup is probebly different then most crawler setups. In the Army the track vehicles have rubber pads on the tracks, torsion bar and roadwheel suspension, an idler wheel with a tension mechanism, and a drive sprocket. How similar are crawlers?? Thanks for any info.

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Nathan in Ohio

11-26-2005 09:00:49




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 Re: Undercarriage Question From a Newbie in reply to Nathan in Ohio, 11-25-2005 12:30:49  
Thanks guys. I have learned a lot and your links were very helpful.



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CH

11-26-2005 06:08:32




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 Re: Undercarriage Question From a Newbie in reply to Nathan in Ohio, 11-25-2005 12:30:49  
I have a Link height and a inside Pin&Bushing wear chart on my site. For the most part it is all you need to know. Unless you are working on late equipment just check rollers and idlers for tightness and wear pattern. Most don't fix correctly anyhow so it is all a waste of time. As soon as one finds out how exspenive it is then that ends it,but for most of what gets talked about in here home owner /hobbiest alot of the wear measurements are way to rigid. For a machine that gets maybe 50 hours a year a 100% worn height link will go another 5 years as long as inside wear is about 50% and there not working on steep slopes or and real rocky ground. Remember these charts are industry standards and for a toy they are about 1/2 of what you can go. Inside Pin&bush wear is more critical then rail height in a limited use machine.For several reasons one Pitch the more wear the longer the pitch the higher you wear the spocket tooth and more likely to walk out of the chain also as it wears(the p&b) the Front idler is farther out on the truck and the farther out the weaker the truck and more chances of bending it and putting side pressures on front idler from a slopy track trying to come off same in the rear,both ends trying to come off put undue stress on final drive axles,bearings and housing. You want that Front Idler back as far as you can.

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Hermit

11-25-2005 17:55:49




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 Re: Undercarriage Question From a Newbie in reply to Nathan in Ohio, 11-25-2005 12:30:49  
Here's an article about things to look for when buying a used dozer. It has lots of pictures, descriptions and explains wear percentages.

http://www.heavyequipment.com.au/pdf/info/dozer.pdf



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JCSinGA

11-25-2005 15:28:55




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 Re: Undercarriage Question From a Newbie in reply to Nathan in Ohio, 11-25-2005 12:30:49  
Undercarriage consists of the drive sprocket, bottom rollers, top idler, front idler, rails or chains (as some call them) which have pins and bushings in them, and finally the track pads. A new undercarriage is 100%, 80% means that you have worn 20% off of the new undercarriage specs. There is a measurement for each component and the difference between new specs. and what the component actually measures is how they figure the %. Most times I have found these % figures to be very inaccurate. I'm no help on how a tank compares but have often wondered how the track stays on as fast as they run.

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old

11-25-2005 12:47:34




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 Re: Undercarriage Question From a Newbie in reply to Nathan in Ohio, 11-25-2005 12:30:49  
A lot of it is very close to what a tank has. The term your talking about has to do with the parts that the tracks run on and what you under side looks like. Sprockets rollers etc. Others will probably add to that. Shoot if you want a little one I have one for sale. LOL



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TimBinWV

11-25-2005 17:13:52




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 Re: Undercarriage Question From a Newbie in reply to old, 11-25-2005 12:47:34  
Got a little what for sale? LOL!!! Not too "OLD" ,eh? Sorry for the witlessness,but really,What have you got and where are you?E-mail is open. Thanks!



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old

11-25-2005 17:23:01




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 Re: Undercarriage Question From a Newbie in reply to TimBinWV, 11-25-2005 17:13:52  
I have an Oliver/Cletrac OC-3. I'm in Missouri



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