Onan KY Generator Service Repair Maintenance OVERHAUL Shop Manual 981-0503

This is the service manual for the ONAN KY 4000 Series MicroLite generator sets (gensets). It contains specific mechanical and electrical information essential for troubleshooting, servicing, repairing, or overhauling the engine. The table of contents provides quick access to separate engine system sections. Additionally, separate Parts Catalogs are available at the dealer level for parts identification and their proper location on assemblies. The TROUBLESHOOTlNG GUlDE offers a quick reference for locating and correcting engine trouble. The illustrations and procedures in each section are applicable to the engines listed on the cover. Please note that the front end of the engine is the flywheel end, and right and left sides are determined by viewing the engine from the front. The disassembly section includes major overhaul procedures for step-by-step removal, disassembly, inspection, repair, and assembly of the engine components. The wiring diagram illustrates how the electrical components are interconnected.