Komatsu 707-99-46320 Arm Cylinder Seal Kit

The 707-99-46320 seal kit is engineered for the arm cylinder of Komatsu hydraulic excavators. It contains all necessary seals, O-rings, wear rings, and backup rings to rebuild the cylinder to factory specifications. The kit utilizes high-grade NBR and PTFE compounds resistant to hydraulic oil, abrasion, and extreme temperatures encountered in construction environments. Precision-molded components ensure exact fitment for 85mm rod and 120mm bore cylinder assemblies. This kit restores sealing integrity, eliminates drift, and extends service intervals for heavy-duty excavation cycles. Direct interchange for Komatsu OEM part numbers 707-99-46320 and 7079946320.