Interesting your commented on hydraulic drive tractors. First off keep in mind that most modern large earth moving equipment such as bulldozers and excavators use all hydraulic drives today. And they move mountains with ease.
In my opinion, The reason this all hydraulic tractor fell out of flavor is the purchase price and maintenance costs.. I came across my uncles receipt for the this tractor in 1992 at a whopping $9,600.00! With inflation $20,900.00 today. When you can purchase a 48 belt drive John Deere S240 for $3,700.00 including the price of ear protection today. Weight JD = 460 pounds while Ingersoll = 700 pounds. The difference in cost has to do with where these machines are made. The Ingersoll 100% USA made. Many JD's components are made outside the USA. In comparison my JD 2210 is a three cylinder diesel all wheel drive with a 60 front end loaded, backhoe, 60 belly mover deck, 48 rear tiller, and box blade was around $20,000.00 twenty years ago. Weights south of 2,500 pounds Today price approaching $35,000.00.
I have researched online the issues with this Ingersoll all hydraulic tractors. The main problem some mistakenly use hydraulic oil. That is too thin. Or don't change the oil regularly. Both causing overheating problems and shorten the tractor's life. Along with attachment and drive not performing well. I use 20W50, though recommended is 10W40. Plus I don't over rev the engine. All it takes is just over idle to mow.. Higher and thicker grass along with hills do not slow the tractor significantly.

My uncle plowed his two acre garden using a Brinly single blade plow without issues behind the Ingersoll tractor. I would say that's a good test of the machine's capability. No need for me to try it. I'll use the 48 tiller behind my John Deere. Other OEM attachments that were not passed on are a hydraulic log splitter, chipper shredder, 41 hydraulic tiller, vacuum with trailer, snow blade, snow cab, and lawn sweep.
