John Deere 650 hydrolic fluid change

This is a hands-on hydraulic fluid change on a John Deere 650 that appears to be a project/revival tractor rather than a daily-driver demo. It walks through draining the hydraulic reservoir and gearbox low-spot plug, cleaning the screen, swapping the filter (noting a tight fit), inspecting the O-ring, and refilling with 3.5 gallons of J20C-rated fluid. Good for owners doing their own service on an older 650.

Appears to be an owner documenting DIY maintenance on their own John Deere 650, not a dealer or professional mechanic.