This comprehensive Allis Chalmers Model 616, 620, and 720 Tractor Service Repair Manual is a valuable resource for technicians, mechanics, and anyone seeking detailed information on these tractor models. It provides in-depth instructions and guidance on all aspects of maintenance, troubleshooting, and repair.

The manual covers a wide range of topics, including:

* **General Maintenance:** This section outlines routine maintenance procedures to ensure your tractor operates smoothly and reliably.
* **Troubleshooting:** Learn how to diagnose and resolve common problems that may arise with your tractor.
* **Engine Service/Repair:** Detailed information on engine components, operation, and repair procedures.
* **Transmission Service/Repair:** Understand the workings of the transmission system and how to maintain and repair it.
* **Brake System:** Comprehensive coverage of brake system components, troubleshooting, and repair techniques.
* **Wiring Diagram:** Detailed diagrams of the electrical system to help you understand wiring configurations and troubleshoot electrical issues.
* **Electrical System:** Information on the electrical system, including components, testing, and repair.
* **Suspension:** Guidance on suspension components, troubleshooting, and repair.
* **Periodic Lubrication:** Comprehensive instructions on proper lubrication schedules and procedures.
* **Steering:** Detailed information on steering system components, adjustments, and repairs.
* **Cooling System:** Learn about the cooling system, maintenance, and troubleshooting.
* **Fuel Injection:** In-depth coverage of fuel injection systems, components, and repair procedures.
* **Fuel System:** Information on the fuel system, including components, troubleshooting, and repairs.
* **Emission System:** Guidance on maintaining and repairing the emission system.
* **Heater/Air Conditioner:** Instructions on operating and maintaining the heating and air conditioning systems.
* **Engine Control System:** Understanding the engine control system and its operation.
* **Chassis/Body:** Information on the tractor's chassis and body, including components, maintenance, and repair.
* **Restraint System:** Guidance on safety restraints and their operation.
* **Interior:** Information on the tractor's interior, including components, maintenance, and repair.
* **Differential/Drive:** Detailed information on the differential and drive system, including components, troubleshooting, and repairs.
* **Axle:** Guidance on axle components, maintenance, and repairs.

This comprehensive manual empowers you to perform maintenance, troubleshooting, and repairs confidently, saving time and money.

The Allis Chalmers Model 616, 620, and 720 tractors were a series of versatile and powerful agricultural machines produced by Allis Chalmers from the late 1950s to the early 1970s. These tractors were designed to handle a wide range of tasks on farms, from plowing and disking to harvesting and transporting. The Model 616 was the smallest of the three, featuring a 4-cylinder gasoline engine with a 3.5-liter displacement and a rated horsepower of 40. The Model 620 was a step up, offering a 4-cylinder diesel engine with a 3.9-liter displacement and 50 horsepower. The top-of-the-line Model 720 boasted a 6-cylinder diesel engine with a 6.6-liter displacement and a robust 70 horsepower. All three models shared a similar design, with a durable cast-iron frame, a spacious operator's cab, and a robust transmission system. These tractors were known for their reliability, ruggedness, and ease of maintenance, making them popular choices for farmers across the United States.

The Allis Chalmers Model 616, 620, and 720 tractors came equipped with several notable features that further enhanced their practicality and performance. The tractors were equipped with a hydraulic system that powered a variety of implements, such as plows, cultivators, and loaders. The hydraulic system was controlled through a lever on the steering column, allowing the operator to easily adjust the lift height and pressure. The tractors were also equipped with a power take-off (PTO) shaft, which provided power for other implements, such as balers and mowers. The PTO shaft was located at the rear of the tractor and was controlled through a lever on the operator's platform. The tractor's spacious cab provided a comfortable and safe operating environment, featuring a well-designed dashboard with easy-to-read gauges and controls. Additionally, the tractors were designed with a robust undercarriage and a wide track width, which provided stability and traction on uneven terrain. These features contributed to their overall versatility and made the Allis Chalmers Model 616, 620, and 720 a popular choice for farmers seeking a dependable and efficient workhorse for their operations.