1. The G3516B Caterpillar Gas Engine Electrical & Hydraulic Schematic Manual is a comprehensive guide designed for the N6E serial number model. This manual provides detailed diagrams and information on the electrical and hydraulic systems of the engine, making it an essential tool for maintenance and troubleshooting. With clear and easy-to-follow schematics, this manual ensures that users can effectively service and repair their Caterpillar gas engine with confidence.