CASE 189654A1 Boom Cylinder Seal Kit

This hydraulic cylinder seal kit is engineered for the boom cylinder on CASE 570LXT loader landscapers and CASE 580L/580M loader backhoes. The kit contains all necessary seals to rebuild the boom cylinder, including O-rings, rod wiper seals, and backup rings manufactured to OEM specifications for dimensional accuracy and material compatibility with hydraulic fluids. The kit replaces CASE OEM part numbers 189654A1 and 182218A1. It is designed for cylinders with a 4.5-inch bore diameter and 2.25-inch rod diameter. Seal materials typically consist of polyurethane (PTU) and nitrile rubber (NBR) compounds for high-pressure resistance and temperature stability in construction equipment operating environments. Installation restores hydraulic integrity, preventing external leakage and internal bypass to ensure smooth lifting and lowering functions.