John Deere 4100 3-Point Hitch Won't Lift: Rockshaft Teardown & Hydraulic Diagnosis Part 1

This is a hands-on teardown by a longtime owner (15 years, 1999 model) diagnosing a 3-point hitch that won't lift on a JD 4100 hydrostat. Part 1 covers removing the seat, rockshaft assembly, and cylinder/piston, then pulling and inspecting the valve and isolation valve, tracing hydraulic flow with compressed air. No fix yet; it ends mid-diagnosis. Best for owners troubleshooting the same hitch-lift failure who want real teardown detail, not a quick overview.

Posted by the Southern App Acres channel, an owner working on his own tractor rather than a dealer or professional mechanic.