Caterpillar 2788641 Hydraulic Cylinder Seal Kit

The Caterpillar 2788641 hydraulic cylinder seal kit is engineered for boom and blade cylinder maintenance on mini hydraulic excavators. The kit contains seals constructed from PTFE, polyurethane (PU), and rubber compounds designed to withstand high-pressure hydraulic fluid, pressure cycles, and wear. It is configured for a rod diameter of 45 mm and a bore diameter of 80 mm. This kit services cylinder assemblies including part numbers 2737033, 2840420 (boom) and 2666979 (blade raise/lower). It provides a complete sealing solution for cylinder repair and rebuilding procedures, restoring hydraulic integrity and preventing internal leakage.