YNF12211 Seal Kit 518-5137 CAT 330D Stick Cylinder Seal Kit Excavator Hydraulic Ram Repair Kit

The YNF12211 stick cylinder seal kit, replacing OEM 518-5137, is specifically engineered for the CAT 330D excavator arm/stick hydraulic cylinder. This seal kit restores the cylinder’s sealing performance, prevents internal and external oil leakage, and ensures stable hydraulic power during heavy-duty operations such as digging, trenching, and material handling.

Each sealing component is made from high-grade polyurethane, NBR, PTFE, and wear-resistant composite materials, offering excellent resistance to abrasion, temperature changes, and high hydraulic pressure. The precision-manufactured kit ensures proper fitment, long service life, and consistent sealing performance under demanding job-site conditions.

Widely used by excavator maintenance workshops, machinery rental companies, and aftermarket parts distributors, YNF12211 is a cost-effective and reliable solution for restoring CAT 330D stick cylinder performance. It ensures smooth ram movement, improved lifting strength, and reduced downtime for construction fleets.