Generac Air Cooled 4000 (4390, 4456, 4389) Series Service & Repair Diagnostic Manual. A complete guide to repairing Generac Air Cooled 4000 series generators. Includes all troubleshooting flow charts, wiring diagrams, pinouts, and more! This is the book that a Generac trained service tech carries. 146 pages!
Covers the popular models 4390 15kW, 4456 12kW and 4389 7kW plus many more!
This manual is ONLY for units with mechanical governors, and not the newer style stepper motor controlled 5200 series!
Manual is in full color with full color wiring diagrams (most images are in black and white).
All digital downloads are non-refundable due to their nature. Once payment is received a download link will be sent by our system automatically. In some cases the payment must be manually approved on our end and there may be a delay in receiving your download link, usually no longer than 24 hours.
This is a PDF copy of the manual, not a paper or bound copy. You will need the most current version of Adobe Reader installed in order to view or print the manual.
Generac Service & Repair Manuals will also usually fit the following Generac branded generators: Honeywell, Guardian, Siemens, Carrier, Watchdog, Centurion, Eaton & Bryant.
Gentek Power is not responsible for errors or missing information in these manuals. These are provided by Generac to us and no warranty is implied. We make every effort possible to keep them updated to the latest version.