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. For parts identification and proper location on assemblies, refer to the separate Parts Catalogs available at the dealer level. 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. Note that the front end of the engine is the flywheel end, determining the right and left sides when viewed from the front. The disassembly section includes major overhaul procedures for step-by-step removal, disassembly, inspection, repair, and assembly of the engine components. Additionally, the wiring diagram illustrates the interconnection of electrical components.