Wow, I am impressed by the quickness of the responses.
There has got to be a set of HD rails and pads out there on an excavator or something that will work on the early D6K track frame. Searching...... Meanwhile I am looking for D6K2 track frames . I like the hydraulic drive that dials down to 1/10 gear, the view of the cutting edges and the pressurized cab. I've been an open cab guy in Alaska for 46 years. A Cat man ,about to go Komatsu, lol.
I bought a early D6K LGP model that had 6000 hrs on it ,the tracks seemed ok except for some minor damage to pads, I ran it a hundred hours in a couple years ,it seemed fine. This year, It got worked hard for 500 hrs walking over logs and stumps, silty mud and burning tundra, the master pins kept turning in the link. I called the track guru up here, told him I had problems with the masterlink and he said "get used to it, they are junk, weld em" We have been searching for a solution , in vain so far. $30K for new chains (sys one) and pads and sprockets from the dozer mafia is the best I can find so far. I had to replace the masterlink, the mafia service people were really no help with a field repair, they arrived without the new masterlink I had gold streaked some 60 hours earlier, and no tools. The press he had was for a hightrack and didnt fit. He left at his bosses instruction, I had to practically accost him to get one of the inner links, and a pair of outer links he did bring. I had to send an expediter 200 miles to get the new masterlink left at the shop. That was a long night in the rain for me. I cut an outer and innerlink off with a cutoff wheel and pressed on a new inner and outerlink with a bottle jack, sledge hammer and a couple pieces of pipe and blocks of wood cut out of a burnt log. I then installed a new master link on new pins by sunup. The new pins in new masterlinks with new bolts had spun in the link during the first hour, I had to weld them in to stop that.....How can Cat not recall that junk or at least provide a solution ??. To add insult to injury, the cat service sent me a bill for $2,500 for showing up without the parts or the tools, blocked me from ordering more parts untill I paid the bill. I tried having a friend buy parts in Oregon and they refused to sell them parts to be shipped to Alaska. Ya, might be mafia if they come after me. Sadly I have 4 other Cat dozers, all old school , all reliable. May be time to retire.