DOWNLOAD COMPLETE FOR JOHN DEERE TECHNICAL MANUAL 6620, 7720, 8820 AND 6620 COMBINE | PUBLICATION NUMBER - TM1202  

This comprehensive technical manual (TM1202) covers the John Deere 6620, 7720, and 8820 combine harvesters, providing detailed specifications, operational procedures, and maintenance protocols. Designed for technicians, operators, and service professionals, this resource delivers in-depth guidance on engine systems, hydraulics, electrical components, and mechanical assemblies. The manual includes diagnostic troubleshooting, parts identification, and step-by-step repair instructions essential for maximizing equipment performance and longevity. An indispensable reference for anyone responsible for the upkeep and operation of these classic John Deere combines.

CONTENT:
GENERAL
General Specifications
Diagnosing and Testing Procedures
Tune-Up and Adjustment
ENGINE REPAIR
Specifications and Special Tools
Cylinder Head, Valves and Camshaft
Block, Liners, Pistons, and Rods
Crankshaft and Main Bearings 
FUEL AND AIR REPAIR
Specifications and Special Tools
Intake System
Diesel Fuel System
Control Linkage
ELECTRICAL REPAIR
Specifications and Special Tools
Harness Replacement
Charging Circuit Repair
Starting Circuit Repair
Lights, Instruments, and Accessories
POWER TRAIN REPAIR
Specifications and Special Tools
Clutch
Transmission
Differential
Final Drive
Sundstrand Hydrostatic Drive
Eaton Hydrostatic Drive
Wheel Drive (Planetary Gearing)
Wheel Drive (Cam Lobe)
Posi-Torq Ground Drive
Tires and Wheels
STEERING/BRAKES REPAIR
Specifications and Special Tools
Power Steering
Brakes
HYDRAULIC REPAIR
Specifications
Reservoir
Hydraulic Pumps
Hydraulic Valves
Hydraulic Cylinders
Hydraulic Motors    
Specifications
Rear Hood
Cylinder Rear Cover
Separator Uprights
 OPERATOR STATION REPAIR
Specifications and Special Tools
Air Conditioning System
Air Intake (Pressurizer) System
Heating System
Personal Posture Seat
Miscellaneous Components
HEADER REPAIR
Specifications and Special Tools
and 900 Series Cutting Platforms
Series Corn Heads
, 50A Series Row-Crop Heads
FEEDER HOUSE REPAIR
Specifications and Special Tools
Feeder Conveyor Chain
Feeder Conveyor Drum
Feeder House Drives and Reverser Gear Case
Feeder House Drives (SideHill 6620 Combines) ( -610300)
Feeder House Paddles, Stripper and Front Closure Sheets (SideHill 6620 Combines ( 403300)
Feeder Conveyor Chain, Upper Shaft, Paddle and Shaft, Conveyor Drum and Front Sheets (SideHill 6620 Combines) (403301- )
SEPARATOR REPAIR
Specifications and Special Tools
Cylinder, Concave, and Beater
POSI-TORQ Cylinder Drive
Dual-Range Cylinder Drive
Straw Walkers and Crankshafts
Straw Chopper and Straw Spreader
Shoe Augers, Fan, and Shoe Frame Tailings, Elevator and Augers
Tailings Elevator and Augers
Lower Auger, Clean Grain Elevator, and Grain Tank Loading Auger   GRAIN TANK UNLOADING SYSTEM
Specifications
Grain Tank Cross Augers
Vertical Auger and Bevel Gears
Horizontal Auger and Gearcase
Grain Tank and Extensions
MAJOR DRIVES REPAIR
Specifications
Engine Powershaft
Primary Countershaft
Secondary Countershaft
SIDEHILL LEVELING SYSTEM REPAIR
Specificatinos and Special Tools
Electrical Components
Hydraulic Components
AUTOMATIC HEADER HEIGHT CONTROL REPAIR
Specifications and Special Tools
Repair of Components
ENGINE OPERATION AND TESTS
Specifications and Special Tools
System Operation
System Tests and Diagnosis
FUEL/AIR OPERATION AND TESTS
Specifications and Special Tools
Air Intake System
Diesel Fuel System
Control Linkage
ELECTRICAL OPERATION AND TESTS
Specifications and Special Tools
General Information and Diagnosis
Electrical System Diagnosis
Charging Circuit
Circuit
Lights, Instruments and Accessory Circuits
POWER TRAIN OPERATION AND TESTS
Specifications and Special Tools
Clutch Diagnosis
Transmission Diagnosis
Final Drive Diagnosis
Hydrostatic Drive Tests and Diagnosis
 Wheel Drive Diagnosis (Planetary Gearing)
Wheel Drive (Cam Lobe)
Posi-Torq Ground Drive Diagnosis
STEERING/BRAKES OPERATION AND TESTS
Power Steering
Brakes
HYDRAULIC OPERATION AND TESTS
Specifications and Special Tools
Hydraulic System Operation
Hydraulic System Tests
Reservoir
Hydraulic Pumps
Hydraulic Valves
Hydraulic Cylinders
Motors
Accumulator
OPERATOR STATION OPERATION AND TESTS
Specifications and Special Tools
Conditioning System
Heating System
Heating System Operation and Tests
SIDEHILL LEVELING SYSTEM OPERATION AND TESTS
Specifications and Special Tools
General Information, Diagnosis, and Tests
Electrical System
 Hydraulic System
AUTOMATIC HEADER HEIGHT CONTROL OPERATION AND TESTS
Specifications and Special Tools
Information, Diagnosis, and Tests
Mechanical System      Electrical System
Hydraulic System
General Information, Diagnosis, and Tests--DIAL-A-MATIC
Mechanical System--DIAL-A-MATIC
Electrical System--DIAL-A-MATIC
Hydraulic System--DIAL-A-MATIC

TOTAL PAGE - 1922

FILE FORMAT - PDF
LANGUAGE - ENGLISH