The John Deere 6600, Side Hill 6600, and 7700 Combines Service Technical Manual (TM1021) is an essential resource for anyone working on these models. This comprehensive manual provides detailed instructions, diagrams, and specifications for every aspect of these combines. With step-by-step guidance and high-quality illustrations, it empowers both experienced mechanics and DIY enthusiasts to perform repairs and maintenance effectively.

The manual covers a wide range of topics, including:

- **General Information:** This section covers specifications, pre-delivery inspections, lubrication guidelines, diagnostic procedures, and tune-up adjustments.
- **Engines:** The manual provides detailed information on engine disassembly, repair, and reassembly, including components like the cylinder head, valves, camshaft, cylinder block, pistons, rods, crankshaft, main bearings, flywheel, lubrication system, cooling system, governor, and speed control linkage.
- **Fuel and Air Systems:** This section covers the air intake system, fuel tank, electric fuel pump, diesel fuel system, gasoline fuel system, and relevant specifications.
- **Electrical System:** The manual provides comprehensive coverage of the electrical system, including wiring diagrams, charging circuits, starting circuits, ignition circuits, lights, instruments, accessory circuits, low-shaft speed monitor systems, harness replacement, and specifications.
- **Power Train:** This section covers the clutch, transmission, differential, final drive, hydrostatic drive, power rear wheel drive, Posi-Torq ground drive, tires and wheels, crawler tracks, and specifications.
- **Power Steering and Brakes:** This section covers the power steering system, brake system, and related specifications.
- **Hydraulic System:** The manual covers hydraulic system operation, tests, the reservoir, pumps, valves, cylinders, motors, oil lines, hoses, and specifications.
- **Operators Cab:** This section covers the pressurizer system, air conditioning system, heating system, personal posture seat, miscellaneous components, and specifications.
- **Headers:** The manual covers 200 Series cutting platforms, Quik-Tatch cutting platforms, 40 Series corn heads, row-crop heads, and specifications.
- **Feeder House:** This section covers the feeder conveyor chain, feeder conveyor drum, feeder house paddies and stripper (Side Hill 6600), variable speed feeder house drives, lower shaft, upper shaft, and specifications.
- **Separator:** The manual covers the cylinder, cylinder cover, concave, beater, cylinder drives, straw walkers, crankshafts, straw chopper, straw spreader, rear hood, shoe supply augers, cleaning fan, sleeve frame, tailings elevator, augers, clean grain elevator, lower auger, grain tank loading auger, separator uprights, and specifications.
- **Grain Tank and Unloading Augers:** This section covers the grain tank auxiliary unloading augers and drive, grain tank inner and outer unloading augers, grain tank, and specifications.
- **Major Drives:** This section covers the engine powershaft, primary countershaft, secondary countershaft, separator control lever, and specifications.
- **Electro-Hydraulic Systems:** This section covers the Side Hill 6600 leveling system (general information, diagnosis, tests, electrical components, hydraulic components), Automatic Header Height Control (general information, diagnosis, tests, mechanical system, electrical system, hydraulic system), unloading auger hydraulic swing and automatic latching system, and specifications.
- **Machine Reconditioning:** This section covers cleaning, painting, decal installation, shielding, and specifications.

This manual provides all the necessary information for keeping your John Deere 6600, Side Hill 6600, or 7700 combine in top working order.

The John Deere 6600 and 7700 Side Hill combines were powerful and versatile machines designed specifically for harvesting crops on sloped terrain. These combines, launched in the late 1970s and early 1980s, were renowned for their innovative side-hill leveling system, which ensured efficient and stable operation on challenging slopes. The 6600 featured a 6-cylinder John Deere engine, while the 7700 was equipped with a more powerful 8-cylinder engine, both offering ample horsepower for demanding harvesting conditions. Their robust construction and durable components made them reliable workhorses capable of handling diverse crops. The combines were available with a range of header options, allowing them to adapt to different grain types and harvesting needs.

Beyond their basic specifications, the 6600 and 7700 side-hill combines boasted several unique features that enhanced their productivity and operator comfort. The side-hill leveling system, a crucial aspect for these machines, utilized a hydraulically controlled chassis that adjusted the combine's angle to maintain a stable platform on slopes. This system ensured consistent crop feeding and reduced the risk of spillage, particularly when operating on steep hillsides. Moreover, the combines featured a spacious and ergonomically designed cab, providing operators with a comfortable and well-equipped workspace. With a clear view of the harvesting process and easy access to controls, these combines aimed to optimize operator comfort and efficiency, allowing for long hours of operation without strain. The John Deere 6600 and 7700 side-hill combines served as valuable tools for farmers seeking to maximize harvest yields on uneven terrain, contributing significantly to the evolution of agricultural machinery.