Komatsu PC300 Swing Motor Seal Kit

This swing motor seal kit is engineered for Komatsu PC300 series hydraulic excavators, covering models PC300-3 through PC300-8 and PC400-7/8 variants. The kit includes all necessary dynamic and static seals for the hydraulic swing motor assembly, such as piston seals, rod seals, wear rings, O-rings, and backup rings manufactured from NBR, FKM, and PTFE compounds rated for 35 MPa system pressure. Designed to restore internal sealing integrity of swing motor part numbers 706-7K-01170, 706-7K-01081, 706-7K-01040, 706-77-01271, and 706-77-01150, the kit prevents hydraulic oil leakage, maintains braking torque, and ensures smooth 360-degree upper structure rotation. Materials comply with industrial hydraulic standards for temperature range -30°C to 120°C and mineral-based hydraulic oils.