This comprehensive John Deere 4050, 4250, 4450, 4650, 4850 Tractors Service Manual (TM1259) provides detailed instructions and diagrams for servicing and repairing these popular tractors. This manual is a valuable resource for both experienced mechanics and DIY enthusiasts. The manual covers a wide range of topics, including engine operation, fuel and air systems, electrical system, power train, steering and brakes, hydraulic systems, operator station operations, and special tools.

The manual is organized into sections and groups, making it easy to find the information you need. Detailed exploded diagrams illustrate the proper disassembly and reassembly procedures for each component. The manual also includes troubleshooting tips and diagnostic procedures to help you identify and resolve issues quickly and efficiently.

The Service Manual includes the following sections:

* **Section 210 - General:** Provides important safety information and an introduction to the manual.
* **Section 220 - Engine Operation:** Covers engine system operation, troubleshooting, and diagnostic procedures.
* **Section 230 - Fuel / Air Operation and Tests:** Covers the air intake system, diesel fuel system, and control linkage.
* **Section 240 - Electrical System:** Includes comprehensive information on the electrical system, wiring diagrams, and diagnostic procedures.
* **Section 250 - Power Train (PERMA-CLUTCH Transmission):** Explains the operation and maintenance of the QUAD-RANGE transmission, PERMA-CLUTCH system, planetary and eight-speed transmissions, and differential and final drive components.
* **Section 255 - Power Shift Transmission:** Covers the mechanical operation, hydraulic controls, PTO, differential and final drives, and transmission diagnosis.
* **Section 260 - Steering / Brakes Operation and Tests:** Covers power steering and brake systems.
* **Section 270 - Hydraulic Operation and Tests:** Provides detailed information on the hydraulic system, including its operation, maintenance, and diagnosis.
* **Section 290 - Operator Station Operations and Tests:** Includes information on the air conditioning, heating, and HYDRACUSHIONED seat systems.
* **Section 299 - Special Tools:** Lists the specialized tools needed for servicing and repairing the tractor.

This John Deere 4050, 4250, 4450, 4650, 4850 Tractors Service Manual is an invaluable resource for anyone who wants to maintain and repair these tractors.

The John Deere 4050, 4250, 4450, 4650, and 4850 tractors were a series of powerful and versatile agricultural machines produced by John Deere from 1979 to 1984. These tractors were part of the "4000 Series," a line of larger, heavier-duty tractors intended for demanding farm work. They were known for their robust construction, reliable performance, and a range of available features that catered to a variety of farming needs. Each model within the series was distinguished by its engine horsepower, with the 4050 offering 105 hp, the 4250 providing 120 hp, the 4450 delivering 140 hp, the 4650 boasting 160 hp, and the 4850 reaching a peak output of 180 hp. The tractors were powered by John Deere's six-cylinder, naturally aspirated diesel engines, known for their durability and fuel efficiency.

The John Deere 4000 Series tractors featured a number of innovative design elements for their time, including a fully synchronized transmission with 16 forward and 8 reverse gears, offering operators precise control over speed and power delivery. They also incorporated a hydrostatic power steering system, providing smooth and responsive handling even during heavy-duty operations. The tractors were equipped with a spacious and comfortable operator's cab, designed to offer a commanding view of the work area and minimize operator fatigue. The cab featured a comfortable seat, ample legroom, and various controls and gauges that were within easy reach of the operator. The John Deere 4000 Series tractors were renowned for their versatility, being compatible with a wide range of implements, including plows, cultivators, harrows, balers, and more. This versatility made them suitable for a wide range of farming tasks, from tillage and planting to harvesting and hauling. These characteristics solidified their position as dependable workhorses on farms across the globe.