KOYO AC4631 Travel Reduction Bearing Assembly

Technical engineering specifications for the AC4631 travel reduction bearing used in Kobelco SK200-1 hydraulic excavators. This single-row angular contact ball bearing features a 40-degree contact angle optimized for combined radial and axial loads inherent in final drive planetary gearboxes. Manufactured to P4 precision tolerances with GCr15 chrome steel rings and rolling elements, it ensures high rotational accuracy and fatigue resistance under severe shock loads. The open configuration with steel cage facilitates lubrication flow in oil-bathed travel motor housings. Direct aftermarket replacement for OEM part number AC4631, cross-referenced to industry standard 846036. Designed for installation in travel reduction assemblies requiring 230 mm bore, 310 mm outer diameter, and 39 mm width dimensional envelope.