Patriot, you sure get the interesting ones!
Unfortunately, the stuff sounds like it is pretty well collectors item stuff -or- for the rugged individual farmer types who aren't scared of fixing machinery. If you can deal the whole works off to someone who will give them a good home....I wouldn't hesitate for long to decide!!
Burning them apart will be a royal pain. You have the experience with heavy burning so I'm sure you can do it. But getting into each compartment in the back end of the cats will get you a geyser of burning oil which will slow down the effort, even if you take the time to drain each compartment. Just not a lot of fun.
I've got one of those D7's, built in 1957, with the 2 cylinder gas pup motor on the side, just like in the photo. My machine has a blade lifted by hydraulic cylinders rather than the cable blade shown. I've also got a 1952 cat D8 with a cable blade just like the photo.
Tried to get $10,000 for the D7 10 years ago. A few farmer types looked but no one was very interested.
The key is the tracks: If the track chains are shot, when you try to use the machines, the tracks want to come off. Not fun to reinstall. No easy way to fix, other than replace the chains, and usually the rollers, track sprockets and front idlers need to be replaced, too. Big bucks, unless you have a machine shop and lots of spare time. About the only thing that is easy to fix on the undercarriage is that you can weld new grouser bars on the track pads to improve traction.
My D7's tracks are rags. It is no good for anything but pulling a disk on my farm, on flat ground. Any work in the rough and the tracks are falling off.
My D8's tracks are for some reason, in real good shape. It needs some new rollers, though. Not sure how I lucked out, but I purchased the machine 8 years ago for well under $5K.
I expect you would get more interest in the D4's as they are smaller and more people are interested in them for pushing snow and the like. Easier to fix, too. Things aren't so heavy. My father-in-law had one, and it was a tough little devil. Same issue with bad tracks and undercarriage, though. Got any pictures of the D4's? Are they old enough to be the side fuel tank machines?
Finally, the newer machines are faster and 'way easier to operate. I have a 1978 D6 that has a more modern torque converter drive and a powershift transmission. And power-assisted clutch/brake steering. To operate the old D8 gearjammer you need to be a musclebound octopus playing a concerto with all the control levers. The D6 can run rings around the D8 in terms of productivity, and that's what counts today.
Keep having fun and photos are a must!!
Jon.
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