Look above the blade at the winchlike arrangement. That's how dozer blades were raised and lowered before modern hydraulics. They were known as cable blade machines, and havent been in widespread use for many many decades.
(By the way, so far that's the most authentic picture of a big cat in the Pennsylvania woods that has been posted on HPa.)
Thats an old "cable 8". First Dozer I ever ran. It wasn't fun when I "two blocked" it and snapped the cable. Took a while and some muscle to repair. Not to mention embarrassing.
Henkels & McCoy still uses them for pulling sleds on gas pipeline construction. Started with a crank start gasoline pony motor. Best way to start a diesel. Oil pressure was up before you close the decompression valve to start the bigger diesel engine.
thats a old boy. occasionally run into old equipment in the woods, but I've never seen a whole dozer. Must have broken down with a serious problem, and if it was old enough, maybe parts were to hard to come by. Price of scrap is up, so it may be worth dragging out if its reasonalbly accessible. Its also been known to happen that some equipment has been reported stolen for the insurance.