changed every fluid in mine over last weekend, and replaced all the grease zerks. the old ones were mostly broken. lots of going back and forth to the manual to find them, using a screw extractor to get the broken ones out, run a tap in the hole, and install new. The oil in the injector pump was quite black, and that surprised me. the magnet in the engine was perfectly clean and i know the oil was 100 hrs old. so that's great. The hydraulic/transmission had a good bit of metal in it. I am sure i have contributed a bit with my gear changes, but i'm getting much better. I was thinking of getting some big magnets and putting them on the trans pan? but no way to clean them really, just take them off when i drain and hope it drains out with the rest. nut on the right side front axle is stuck, i wanted to adjust the lash in the large bearing on the axle for the steering, but could not get it to come loose, tried a cheater pipe, heat, impact wrench many times with some pb blaster and did not get it to budge. maybe next time. new filters all around as well. getting the injector pump bled was a bit of a pain, had to go back and forth about 10 times.
I would like to clean/inspect the over pressure bypass for the hydraulics, any advice there? the old girl plowed 16 inches of snow in 4x4 no trouble with my back blade for my neighbor and I about 2 weeks ago. very happy to have it for that storm!
i found some chicken scratch in the manual where the PO had written the hrs and fluids changed. so that's helpful. 100 hrs on the oil and 200 ago on the hydraulics. i see that the front axle was opened up at some point, and the clutch was replaced a about 200 hrs ago as well.
also upgraded to a harbor freight led flood light on the back, and got the tail and head lights working. used some silver polish on the lenses on mine. looks like yours has sealed beams?? seems odd they would have changed the headlights. I had to order bulbs as they are a base i have not seen before.