Komatsu 144-63-05050 Arm Cylinder Seal Kit

This hydraulic cylinder seal kit is engineered for the arm cylinder on Komatsu D65A-8 crawler dozers (serial numbers 45001-Up). The kit contains all necessary seals, O-rings, and wear rings to rebuild the cylinder to factory specifications. Primary cylinder part numbers referenced are 144-63-69500 and 144-63-69600. The kit accommodates a rod diameter of 65 mm and a bore diameter of 110 mm. Materials are selected for compatibility with standard mineral-based hydraulic fluids and operating temperatures typical in construction machinery duty cycles. Direct replacement for OEM kit 144-63-05050. Also fits D65A-6 (S/N 20006-39999) and D65A-7 (S/N 40001-44999) lift cylinders per cross-reference data.