Brings back some memories. Late sixties/then early seventies after a stint with US, I worked for an excavating contractor. We were moving alot of dirt to build roads. The beastly old Cat track loader was constantly broke down, working in the "pit".
The owner bought a two old cable machines, one a shovel, one a backhoe, for 600 bucks. I cannot recall the make. They both had 3cyl Detroits. We had this old curmugeon mechanic/welder on the crew that knew how to run these beasts so he had at it.
When I worked there, we never did use the hoe but that old shovel made my boss a lot of money. It took very little maintenance to keep it running. Mostly, all it did was move a few feet every now and then so track maint was minimal.
When we did have to string a new cable or something, it would take weeks to wash/wear off that black grease, lol!