NFK Seals Main Valve Seal Kit for Sany SY235

This main valve seal kit is designed for the main control valve of Sany SY235 series hydraulic excavators. It contains all necessary seals, O-rings, backup rings, and wear rings to rebuild the valve spool and body sealing interfaces. The kit addresses both Kawasaki KMX15RB and Dongyang valve configurations commonly fitted to SY235, SY235C, SY235-8, and SY235C-9 models. Manufactured from high-grade nitrile rubber (NBR), polytetrafluoroethylene (PTFE), and polyurethane materials, the components withstand hydraulic system pressures up to 35 MPa and operating temperatures ranging from -20°C to 120°C. The kit restores pressure stability, prevents internal leakage, and ensures precise spool control for boom, arm, bucket, and swing functions.