John Deere AH212103 Hydraulic Cylinder Seal Kit

The AH212103 Hydraulic Cylinder Seal Kit from John Deere Compatible Aftermarket is a hydraulic repair kit designed to restore sealing performance in crowd cylinder systems for John Deere backhoes, with models including 310G, 310SJ, 410J, 410K, and 710K commonly using it to prevent fluid leakage during digging and loading. It uses industrial-grade polyurethane, rubber, PTFE, and metal sealing components for cylinder rebuilds, preventive maintenance, and hydraulic restoration of crowd cylinders. Replacement references include AH219637, AH219640, AH164137, and AH164138, with AHC21922 superseding AH212103; the kit weighs about 0.3 lb and supports 115 mm bore applications (115 mm bore). Common applications span construction, excavation, utility trenching, and earthmoving tasks where reliable boom and crowd cylinder sealing is critical.