The detail that jumped out at me first: a simple ratchet strap doing heavy lifting duty. Before detaching the knuckle on this MX5100, the maker rigged a strap around the assembly, and that one move seems like the kind of thinking that separates a smooth repair from a painful one. The tractor in question is a Kubota MX5100 wearing an LA844 front loader, and the job was a leaking pivot seal at the bevel gear reduction knuckle, one that had been letting Kubota UDT hydraulic fluid escape.
The teardown reads like a tidy sequence. The front left wheel came off with a pneumatic impact wrench, the tractor was driven into position and raised on blue jack stands, and fluid was drained from the lower portal box into an oil pan. Snap rings and retaining hardware came out with pliers and hand tools, the damaged seal was pried out after a look at the contaminated sealing area, and the housing and bearings got a cleanup with aerosol cleaner, a wire brush, and compressed air. Grease went on before the new seal was seated, which strikes me as the right way to treat a fresh lip seal.
Reassembly covered the spindle knuckle being hoisted back and secured with snap rings and bolts, the lower cap going back on, and the portal hub being topped up with gear oil after vent plugs were pulled to relieve trapped air. That vent plug step is easy to overlook, in my opinion, and catching it says a lot about the maker's care.
The verdict came from a test drive around the inside of the workshop, and no leaks showed up afterward. The open question for me is longevity: the repair is verified for now, but whether that sealing area stays clean under loader work is something only time will tell.
Project by Matt Verley. Watch it on their YouTube channel: