The John Deere 9940 Cotton Picker Service Technical Manual (TM1356) is a comprehensive guide for servicing and repairing this model of cotton picker. This manual is designed for both do-it-yourselfers and experienced mechanics, offering detailed instructions and high-quality diagrams to ensure accurate and efficient repairs. It covers every aspect of the machine, providing step-by-step procedures based on complete disassembly.

The manual is organized into sections covering various systems and components:

* **General:** Includes general specifications, pre-delivery and delivery services, tune-up procedures, adjustments, and information about fuels and lubricants.
* **Engine Repair:** Covers engine removal and installation, cooling system maintenance, and related procedures.
* **Fuel and Air Repair:** Provides details on air intake system, diesel fuel system, and related components.
* **Electrical Repair:** Includes specifications, special tools, charging circuit repair, starting circuit repair, and repair for lights, instruments, and accessory circuits.
* **Power Train:** Focuses on the transmission, axles, differentials, standard hydrostatic drive, and Eaton hydrostatic drive.
* **Steering and Brakes Repair:** Covers steering system, brakes, and related components.
* **Hydraulic Repair:** Includes specifications, special tools, reservoir maintenance, hydraulic pump repair, main control valves, hydraulic cylinders, hydraulic motors, and height control system.
* **Axles and Wheels Repair:** Focuses on guide axle and wheel maintenance.
* **Operator Station Repair:** Covers air conditioning, heating, and miscellaneous components.
* **Picking Units Repair:** Includes detailed procedures for removing and installing picking units, grid bars, pressure plates, spindles, picker bars, picker drums, drive shafts, gears, idler gears, bearings, doffers, stub shafts, moistener columns, gear cases, universal joints, countershafts, picking unit cabinets, and cam tracks.
* **Moistener and Air Systems Repair:** Covers the moistener system and air system.
* **Engine Operation and Tests:** Includes specifications, special tools, system operation, and system tests and diagnosis.
* **Fuel and Air Operations and Tests:** Covers the air intake system and diesel fuel system, including operation and diagnosis.
* **Electrical Operation and Tests:** Includes specifications, special tools, general information and diagrams, charging circuit, starting circuit, and lights, instruments, and accessory circuits.
* **Power Train Operation and Tests:** Covers transmission, axles, differentials, and hydrostatic drive systems, including operation and tests.
* **Steering and Brakes Operation and Tests:** Provides details on steering and brake system operation and testing.
* **Hydraulic Operation and Tests:** Includes specifications, special tools, system operation and tests, hydraulic pump, main hydraulic valve, hydraulic cylinders, hydraulic motors, and height control.
* **Operator Station Operation and Tests:** Covers the pressurizer system, air conditioning system operation and diagnosis, and heating system.
* **Picking, Moistener, and Air Systems Operation and Tests:** Provides information on the operation and diagnosis of these systems.

This manual is an essential resource for anyone who needs to service or repair a John Deere 9940 Cotton Picker.

The John Deere 9940 Cotton Picker, a behemoth of the agricultural world, is a testament to John Deere's commitment to innovation and efficiency in cotton harvesting. Introduced in the late 1980s, the 9940 was a top-of-the-line model featuring a powerful engine and advanced harvesting technology. This self-propelled machine boasted a robust 250-horsepower engine, coupled with a sophisticated picking system that maximized efficiency and minimized cotton fiber damage. The harvesting system was renowned for its gentle handling of the cotton bolls, ensuring high-quality fiber yields. The 9940 was designed with an emphasis on operator comfort and convenience, incorporating a spacious cab with excellent visibility and intuitive controls. It was a popular choice among cotton farmers due to its reliability, durability, and overall performance, significantly impacting cotton production during its active years.

The John Deere 9940 Cotton Picker was not just a machine; it was an investment. Its complex design and intricate mechanisms required specialized maintenance and repair, which is where the "TM1356" Service Technical Manual comes into play. This comprehensive manual acts as a crucial guide for mechanics and technicians working on the 9940. It provides detailed instructions, diagrams, and troubleshooting procedures for every component of the machine, from the engine and transmission to the picking system and hydraulics. This invaluable resource ensures that technicians have the necessary knowledge and tools to diagnose, troubleshoot, and repair any issues effectively, keeping the 9940 running efficiently and maximizing its lifespan. The "TM1356" manual is a testament to John Deere's commitment to providing the necessary support for their equipment, ensuring that their customers can rely on these machines to deliver optimal performance for years to come.