Komatsu 20T-63-76300 Bucket Cylinder Seal Kit

The 20T-63-76300 bucket cylinder seal kit is engineered for the hydraulic bucket cylinder on Komatsu PC40-3 and PC40-3C mini excavators. This kit provides the complete sealing arrangement for both the head end and piston end of the cylinder, including piston seals, rod seals, buffer rings, dust wipers, O-rings, and backup rings. Manufactured to OEM specifications using high-grade nitrile rubber (NBR) and thermoplastic polyurethane (TPU) materials, the kit withstands standard hydraulic operating pressures up to 35 MPa and temperature ranges typical in construction machinery environments. It is designed to eliminate external rod leakage and internal piston bypass, restoring full digging force and cylinder holding capability. Direct replacement for Komatsu part number 20T-63-76300.