This comprehensive technical manual provides detailed information on maintaining, assembling, disassembling, and servicing the John Deere 9940 Cotton Picker. It is an essential resource for anyone working on this model, from seasoned mechanics to DIY enthusiasts. The manual features a wealth of information, including specifications, diagrams, and actual real-photo illustrations, presented in a clear and concise format. It is meticulously organized into sections, covering every aspect of the machine, making it easy to find the information you need. **Key sections include:** * **General Specifications:** Discover fundamental details about the 9940 Cotton Picker, including its dimensions, weights, and capacities. * **Engine Repair:** Acquire step-by-step instructions for removing, installing, and servicing the engine, along with troubleshooting tips. * **Fuel and Air Repair:** Learn about the intricacies of the fuel and air systems, including removal and installation procedures for components like the air intake system and diesel fuel system. * **Electrical Repair:** Gain in-depth knowledge of the electrical system, including charging, starting, lighting, and instrument circuits. * **Power Train:** Unravel the complexities of the transmission, axles, differential, and hydrostatic drive systems. * **Steering and Brakes Repair:** Get detailed instructions on repairing and maintaining the steering and braking systems. * **Hydraulic Repair:** Explore the hydraulic system, including the reservoir, pump, control valves, cylinders, motors, and height control. * **Axles and Wheels Repair:** Learn about the guide axle and wheel systems. * **Operator Station Repair:** Find comprehensive information on the air conditioning, heating, and miscellaneous components of the operator station. * **Picking Units Repair:** Delve into the intricate workings of the picking units, including removal and installation, grid bars, pressure plates, spindles, picker bars, drums, drive shafts, gears, idler gears, bearings, doffers, stub shaft, drive, moistener columns, gear cases, universal joints, countershafts, and picking unit cabinets. * **Moistener and Air Systems Repair:** Gain insight into the moistener and air systems. * **Engine Operation and Tests:** Explore methods for operating and testing the engine. * **Fuel and Air Systems Operation and Tests:** Discover techniques for operating and testing the fuel and air systems. * **Electrical System Operation and Tests:** Learn how to operate and diagnose the electrical system. * **Power Train Operation and Tests:** Get detailed instructions on operating and testing the powertrain system. * **Steering and Brakes Operation and Tests:** Understand how to operate and test the steering and braking systems. * **Hydraulic System Operation and Tests:** Gain knowledge of operating and testing procedures for the hydraulic system. * **Operator Station Operation and Tests:** Explore the operation and testing of the operator station. * **Picking, Moistener, and Air Systems Operation and Tests:** Learn about operating and diagnosing the picking, moistener, and air systems. This manual empowers you to diagnose and solve problems efficiently, ensuring that your John Deere 9940 Cotton Picker operates at peak performance.

The John Deere 9940 Cotton Picker, a powerhouse in the world of agricultural machinery, boasts a legacy of efficiency and innovation in cotton harvesting. Unveiled in 1994, the 9940 marked a significant advancement in cotton picking technology. This self-propelled machine is engineered for high-volume cotton harvesting, featuring a robust design and powerful engine for optimal performance. The 9940 is equipped with a wide picking range, ensuring maximum cotton retrieval from the field. Its advanced picking system utilizes a combination of spindles and brush rollers to gently and efficiently remove cotton bolls from the plant, minimizing fiber damage and maximizing yield. The 9940 also features a state-of-the-art cleaning system, employing a multi-stage process to effectively remove debris and foreign matter from the harvested cotton, resulting in a clean and high-quality product. Beyond its mechanical prowess, the 9940 showcases John Deere's commitment to operator comfort and convenience. The spacious cab provides a comfortable and ergonomic workspace, enhancing operator productivity and reducing fatigue during long working hours. The machine is equipped with an intuitive control system, allowing for easy operation and adjustments. The 9940 also features a range of safety features, including a comprehensive lighting system for visibility during nighttime operations and a robust safety cage for operator protection during field work. The John Deere 9940 Cotton Picker, with its blend of technical excellence, safety features, and operator-centric design, stands as a testament to John Deere's dedication to delivering reliable and efficient solutions for the agricultural industry. Its continued presence in many cotton fields worldwide underscores its lasting impact on the cotton harvesting landscape.