This comprehensive Technical Manual provides in-depth information for maintaining, assembling, disassembling, and servicing your John Deere 650 and 750 Tractors. The manual covers a wide range of topics, ensuring you have the knowledge needed to diagnose, repair, and maintain your John Deere machinery effectively.

The manual is divided into sections, each focusing on a specific aspect of the tractor.

* **Section 10 (General):** Includes specifications, special tools, pre-delivery and after-sale services, tune-up procedures, lubrication guides, and detailed information on disassembling both the 650 and 750 models.

* **Section 20 (Engine Repair):** Covers a wide range of engine components, including valve train, cylinder head, camshaft, pistons, rods, cylinder blocks, flywheel, crankshaft, main bearings, lubrication system, and cooling system.

* **Section 30 (Fuel and Repair):** Focuses on the fuel and air systems, including the air intake system, diesel fuel system, and speed control linkage.

* **Section 40 (Electrical Repair):** Provides detailed information on the electrical system, including general information, charging system, starting motor, instruments and accessory circuits, and lighting circuits.

* **Section 50 (650 Power Train Repair) and Section 55 (750 Power Train Repair):** Cover the power train systems for both tractors, including the engine clutch and linkage, sliding gear transmission, rear PTO, differential, final drive, mechanical front-wheel drive, and front PTO.

* **Section 60 (Steering/Brakes Repair):** Provides guidance on repairing the steering and brakes, covering manual and power steering systems and brake components.

* **Section 70 (Hydraulic Repair):** Focuses on the hydraulic system, including the hydraulic pump, rockshaft and implement hitches, and selective control valve.

* **Section 80 (Miscellaneous Repair):** Covers various components, including the front axle assembly, wheels, and operator's station.

* **Section 220 (Engine Operation and Tests), Section 230 (Fuel/Air Operation and Tests), Section 240 (Electrical Operation), Section 250 (650 Power Train Operation and Tests), Section 255 (750 Power Train Operation and Tests), Section 260 (Steering/Brakes Operation and Tests), and Section 270 (Hydraulic Operation and Tests):** Provide detailed information on testing and diagnosing the various systems covered in the previous sections.

This comprehensive manual is designed to be an indispensable resource for anyone working on John Deere 650 and 750 tractors. It features detailed diagrams, color illustrations, and clear explanations, making it easy to understand and use.

## The John Deere 650 and 750 Tractors: Power and Precision on the Farm

The John Deere 650 and 750 tractors were workhorses in the agricultural world, representing a significant step forward in tractor design and performance. These models, produced in the 1970s, were renowned for their robust construction, powerful engines, and advanced features that made them ideal for a wide range of farming operations. The 650 and 750 were powered by John Deere's reliable six-cylinder diesel engines, offering impressive horsepower and torque for hauling heavy loads and powering demanding implements. The 650 model boasted a 100 horsepower engine, while the 750 boasted a more powerful 135 horsepower engine, providing the necessary power for larger farms and demanding tasks.

Beyond their powerful engines, the 650 and 750 tractors were known for their advanced design features. The Power-Shift transmission offered smooth and efficient gear changes, enhancing productivity and operator comfort. The tractors also incorporated a unique hydraulic system featuring a closed-center design, allowing for precise control of implements and ensuring optimal hydraulic performance. These features, combined with their rugged build and intuitive controls, made the 650 and 750 highly sought-after machines for farmers who valued dependability and efficiency. Despite being discontinued decades ago, these tractors continue to be actively used and cherished by farmers worldwide for their enduring performance and reliable capabilities.