i have not been around crawlers a lot. what do they look like when they are worn out? how do you gauge how much life is left in them?
i'm sure if you post what machine you're talking about, someone will be able to help you with the specs that show the percentage of wear for it.
how about a PC 220 excavator or a d4 crawler.
http://www.crawlerheaven.com/wearlimits.htm pin wear limits for the D4 http://www.crawlerheaven.com/tracklinks_chart.htm track link wear for the D4 didn't see anything on the pc220
Hi rshackleford.As far as track wear go's,look at the drive sprocket first.If its sharp or getting near it The track pins & bushings are pretty worn.Check the rail hight as well,The part of the rail that rides on the rollers is what wears.In general ,I have noticed that this part of the rail "when new" will measure about the same as the diameter of the pin on most rails.Check for loose or burnt bottom rollers.If your looking at a dozer I like to run it for a few hours then get off & feel each roller,If its hot it dont have alot of life left in it .
I work with undercarriage all the time and have actually taught a class or two to end users and such. I'll post some photos of what items actually look like over the next several days. The photo below is a worn out sprocket. I'll post photos as you request them.
Awesome job John C. Looks like he has you headed in the right direction. One small comment I will add, an excavator can wear the pin on the inside and the outside bushing look fine. Grab a bar and stick it in the track and see if you can get any twisting motion. John help me out, I have drawn a blank on how to describe what I am trying to say. I know you an read my mind. lol.
TD25C, what does it mean if the bottom roller flanges are wearing into the track link pin bosses?
your rollers and possibly your rails are wore out. a quick check is to see how much clearance there is between the rail pin boss and the flange of the bottom rollers. if it's getting close to touching they're wore right out
Excavator chains that are worn out will get very snakey. What really indicates the wear though is how much the rails have spread on the pins. This indicates lots of shock loading.
class is in session.............i know i can learn someting.
Here are photo of roller flange wear. Tell me what you see.
before we get to far please give me a quick lesson on terminology. i understand some of what you are saying but lets start with the basics. you can skip sprocket, i get that part (its the dog from fraggle rock!).
looks like the rail is worn to the point where it's contacting the roller flanges????
I see extreme boss wear, but i'm not entirely sure its roller wear, link (rail) wear, or both. Perhaps the track frame or track guides are cutting into the bosses as well? I also see some weird pattern showing up on the pads? Check out the scalloping where the pads overlap one another.
The pad wear you see in the second photo is the rock guards wearing into the the bottoms of the pads. The wear on the track pin bosses is between the end of the pin and the outside of the track rail. Guides and wear bars rub against the ends of the pins. What else can you tell about the tracks in the second photo?
Not sure but it looks like one pad bolt is loose? Perhaps some loose pads ?
JohnC, great pics!!! Salt chains in the second pic.
Yep,Like sledgehammer said the rails & possibly the rollers are worn down.Excellent post's and presentation John C.
Good eye on the pad bolt. Actually there is still plenty of rail height in both photos. The second photo is starting to show the roll off and sharpening on the back ends of the rails. Usually you would have to measure the rail height to tell how bad they are. Did anyone mention the belly in the track in the second photo? Looks like lots of space between the sprocket when the bushing should be engaged with teeth. When you see that kind of wear in the pin bosses you should look real close for broken rollers. I call them shakers because you can wobble them around by hand. The next photos illustrate the clearance between the bottom roller flanges and track pin bosses.
Cool, thanks for the lesson.
Keep this studd going. Now how about the rock guards My 72 D5 is missing about 1" deep by 7" long just as it flattens out at the bottom, how bad is it?
Most people around here have done away with rock guards. Usually only the machines working in the woods have them. It sounds like yours might have cracked and broke off on the bottom? It really doesn't hurt anything to leave it alone until you have to do something with the bottom rollers.
does anyone know a website thats free to look up year and manufature origin . to verify equipment info . thanks