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Overview
A practical step-by-step teardown and rebuild of hydraulic quick-connect couplers on a John Deere 4455, walking through disassembly, seal identification, o-ring and backup-ring replacement, poppet and barrel reassembly, and ball-bearing reinstallation with grease tricks. No parts numbers or pricing are discussed, but the sequence is detailed enough to follow along as a repair guide. Most useful to owners tackling leaking hydraulic couplers themselves for the first time.
Posted by the Joe Preston channel, which shows no channel description, suggesting an independent owner-operator sharing hands-on repair work rather than a dealership or sponsored source.