Let me start by saying I have never done undercarriage repair before. Have an older PC400-5 for work on the farm. Have one link in the chain that appears the two halves of the link are spreading. On the outside of the link the pin is where it should be, but on the inside of the chain the other end of the pin is recessed about 1/2 inch. There are gaps where the outer links are slightly wider than they should be around the subsequent inner links. It appears the bushing is in place but a bit deformed, and looks like the seal at the end of the bushing is bad. (see pics) The rest of the chain and links on either side appear to be fine. 1. Does the track link need to be replaced, or just the pin, bushing and seal? 2. Would it be a bad idea to loosen up the bolts holding the shoe on and try to pound the link back together (inner half of the link back onto the pin) and then keep running it until failure or near failure, or should this be completely replaced soon? 3. this is NOT the master pin. 16lb sledge and a drift or an air hammer reasonable tools for removing the pin if necessary? Is it possible to reasonably rent portable pin presses? Thanks in advance. Outside of track, pin is flush: Gap between outside link and subsequent inside link: Detail of gap and broken seal: Inside of chain bushing is slightly deformed, appears oil has leaked out of broken seal:
where bushing meets outer side of track, leaked oil: where bushing meets inner side of track, dry:
Gap on inside side of track: Pin is recessed on inside of track about 1/2 inch, should be flush:
Showing on the inside of the track, the pin is recessed into the link about 1/2 in, but should be flush:
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I don't see how this could happen on a regular track link without the track shoe coming loose. Are you sure that if it's not THE master pin, that it's not A master pin? On the larger machines I have, in the past, seen track chains delivered in two pieces hence two master pins, and the amount that the bush is protruding suggests master bush. And in your last pic, is that a dimple in the centre of the pin? Without seeing it in person, my best guess is that it is a master pin which has been half-heartedly beaten in, spreading the link and not sending the pin all the way through. If you know the history of the machine and can definitely say that isn't the case, I withdraw my comments.
I second Cmark's opinion,looks like a desperate weekend field repair that got jammed.Fix it right and it will serve you well,half-ass it and you will have to open it again later.
Kind of looks like the link that holds the bushing has also spread so might not be a master bushing. But the pin looks like a repair pin. The wear on the middle of bushing kind of looks normal and they don't usually have oil in them .I would suggest you hire someone with a press to repair your track. Good luck Bob
I agree with Cmark. Unless I'm missing something, I can't see how this can happen without there being some sort of an issue with the track shoe bolts. Loose, broken or the holes egged out on the track shoe. Just my $.02
That's what worn out Komatsu tracks look like. There is no fix for what you are showing in the photos. You need new ones or at least less worn ones. What do the sprocket teeth look like?
The bolts sure don't look loose but the track is well worn. Maybe that pin broke and spread the outside link and the repair was haftast or the track was short tracked there. Still needs a new pin have it pressed in, if you decide to beat on it be aware that is one of the more dangerous repairs there is. Bob