This comprehensive John Deere 4400 and 4420 Combines Technical Manual provides in-depth information about maintaining, assembling, disassembling, and servicing your combine. Packed with detailed specifications, diagrams, and real-life photo illustrations, this manual is an essential tool for diagnosing, repairing, and maintaining your John Deere machinery. It covers a wide range of topics, including:

**Engine Repair:** The manual includes detailed information for both diesel and gasoline engine repair, covering topics like cylinder head, valves, camshaft, block liners, pistons, rods, crankshaft, main bearings, flywheel, lubrication system, and cooling system.

**Fuel and Air Repair:** This section covers components like the air intake system, diesel fuel system, control linkage, and more.

**Electrical Repair:** The manual provides thorough instructions on harness replacement, charging circuit repair, starting circuit repair, ignition system repair, and lights and accessory circuits.

**Power Train Repair:** Get detailed instructions for repairing the clutch, transmission, differential, and final drive.

**Steering and Brakes Repair:** The manual covers power steering and brake repair.

**Hydraulic Repair:** This section includes information on the reservoir, hydraulic pumps, valves, cylinders, motors, and accumulator.

**Separator Shell Repair:** Learn about repairing the rear hood, cylinder rear cover, and separator uprights.

**Operator Station Repair:** Get instructions for repairing the air conditioning platforms, pressurizer system, heating system, personal posture seat, and cab roof.

**Header Repair:** This section covers repair for 200 series cutting platforms, Quik-Tatch cutting platforms, 40 series corn heads, and row-crop heads.

**Feeder House Repair:** The manual provides detailed instructions for repairing the feeder conveyor chain, drum, variable speed drives, lower shaft, and upper shaft.

**Separator Repair:** This section covers repair for the cylinder, concave, beater, cylinder drives, straw walkers, crankshafts, straw chopper, straw spreader, shoe supply augers, cleaning fan, shoe frame, tailings elevator, augers, lower auger, clean grain elevator, and grain tank loading auger.

**Grain Tank Unloading System Repair:** Learn about repairing the grain tank auxiliary unloading augers, drive, inner and outer unloading augers.

**Major Drives Repair:** This section covers repair for the engine powershaft, primary countershaft, and secondary countershaft.

**Automatic Header Height Control Repair:** Includes repair instructions for various components.

**Engine Operation and Tests:** The manual includes information on system operation and tests, including specifications and special tools.

**Fuel and Air Operation and Tests:** Get details on system operation and tests for air intake and fuel systems.

**Electrical Operation and Tests:** This section covers general information, diagnosis, and tests for charging, starting, lights, instruments, and accessory circuits.

**Power Train Operation and Tests:** The manual includes information on system operation and tests for clutch, transmission, and final drive.

**Steering and Brakes Operation and Tests:** This section covers power steering and brake operation and tests.

**Hydraulic Operation and Tests:** This section covers system operation and tests for reservoir, pumps, valves, cylinders, motors, and accumulator.

**Operator Station Operation and Tests:** The manual includes operation and tests for air conditioning, pressurizer system, and heating system.

**Automatic Header Height Control Operation and Tests:** Get information on general information, diagnosis, and tests, including mechanical and electrical systems.

This manual provides comprehensive guidance for all aspects of maintaining, repairing, and servicing your John Deere 4400 and 4420 Combines, making it an indispensable resource for any owner or operator.

## The John Deere 4400 and 4420 Combines: Workhorses of the Harvest

The John Deere 4400 and 4420 combines, produced from 1985 to 1993, were designed to be dependable workhorses in the field. These mid-size combines, featuring a 130-horsepower John Deere 6.8L diesel engine, provided a balance of power and efficiency for medium-sized farms. Their robust construction, featuring a heavy-duty steel frame and a durable threshing system, made them capable of handling a wide variety of crops, from wheat and barley to soybeans and corn. The 4400 and 4420 incorporated several innovative features, including a patented "Dura-Drum" threshing system, which offered increased capacity and reduced grain loss. The combines also featured a unique "Power-Shift" transmission, allowing operators to smoothly change speeds while on the go, enhancing productivity and operator comfort.

Beyond their mechanical prowess, the 4400 and 4420 combines were designed with the operator in mind. A spacious, well-equipped cab provided excellent visibility and a comfortable working environment. The intuitive control layout and ergonomic design allowed operators to manage the machine with ease. The combines also featured a sophisticated hydraulic system, which ensured smooth and responsive operation of all functions. These thoughtful design features contributed to the 4400 and 4420's reputation as reliable and user-friendly machines. With their impressive performance, robust construction, and operator-focused design, the John Deere 4400 and 4420 combines remain a popular choice for farmers and agricultural businesses seeking a dependable and efficient solution for their harvesting needs.