1. The G3516 Caterpillar Gas Engine Electrical & Hydraulic Schematic Manual is a comprehensive guide designed for the N6A 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 is a valuable resource for ensuring optimal performance and efficiency of the G3516 engine.