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Overview
This is a narrow, hands-on how-to for converting the John Deere 3020/4020 hydraulic outlets from standard barrels to ISO couplers, not a general tractor overview. It walks step by step through removing the old coupler, e-clip, and pin, fishing out the O-ring and backer plate, installing the new shaft, torquing the nut to 35 ft-lbs, and sealing the expansion plug. Best for owners doing this exact repair.
Posted by the Jamaican Farmer channel, an owner sharing a direct, hands-on repair walkthrough on their own machine.