John Deere 6620 8820 Service Manual
(TM1202）
For complete service information also see:
JD 7720, 7820 and 7920 Parts Catalog
This John Deere manual contains high-quality images, instructions to help you to troubleshoot, and repair your truck. This document is printable, without restrictions, contains searchable text, bookmarks, cross-links for easy navigation.
This is a repair only manual, Diagnostic Manual with electrical wiring diagrams are sold separately.
Models Covered:
John Deere, 6620 Combine
John Deere Side hill 6620 Combine
John Deere Side hill 7720 Combine
John Deere Side hill 8820 Combine
Service Technical Manual Covers:
SECTION 10 – GENERAL
Group 00 – General Specifications
Group 05 – Diagnosing and Testing Procedures
Group 10 – Tune-Up and Adjustment
SECTION 20 – ENGINE REPAIR
Group 00 – Specifications and Special Tools
Group 05 – Cylinder Head, Valves and Camshaft
Group 10 – Block, Liners, Pistons, and Rods
Group 15 – Crankshaft and Main Bearings
Group 20 – Lubrication System
Group 25 – Cooling System
SECTION 30 – FUEL AND AIR REPAIR
Group 00 – Specifications and Special Tools
Group 05 – Air Intake System
Group 10 – Diesel Fuel System
Group 15 – Control Linkage
SECTION 40 – ELECTRICAL REPAIR
Group 00 – Specifications and Special Tools
Group 05 – Harness Replacement
Group 10 – Charging Circuit Repair
Group 15 – Starting Circuit Repair
Group 20 – Lights, Instruments, and Accessories
John Deere 6620 7720 Service Repair Manual Manual
SECTION 50 – POWER TRAIN REPAIR
Group 00 – Specifications and Special Tools
Group 05 – Clutch
Group 10 – Transmission
Group 15 – Differential
Group 20 – Final Drive
Group 25 – Sunderland Hydrostatic Drive
Group 26 – Eaton Hydrostatic Drive
Group 30 – 4-Wheel Drive (Planetary Gearing)
Group 31 – 4-Wheel Drive (Cam Lobe)
Group 35 – Positron Ground Drive
Group 40 – Tires and Wheels
SECTION 60 – STEERING / BRAKES REPAIR
Group 00 – Specifications and Special Tools
Group 05 – Power Steering
Group 10 – Brakes
SECTION 70 – HYDRAULIC REPAIR
Group 00 – Specifications
Group 05 – Reservoir
Group 10 – Hydraulic Pump
Group 15 – Hydraulic Valves
Group 20 – Hydraulic Cylinders
Group 25 – Hydraulic Motors
Group 30 – Accumulator
SECTION 80 – SEPARATOR SHELL REPAIR
Group 00 – Specifications
Group 05 – Rear Hood
Group 10 – Cylinder Rear Cover
Group 15 – Separator Uprights
SECTION 90 – OPERATOR STATION REPAIR
Group 00 – Specifications and Special Tools
Group 05 – Air Conditioning System
Group 10 – Air Intake (Pressurizer) System
Group 15 – Heating System
Group 20 – Personal Posture Seat
Group 25 – Miscellaneous Components
SECTION 100 – HEADER REPAIR
Group 00 – Specifications and Special Tools
Group 05 – 200 and 900 Series Cutting Platforms
Group 10 – 40 Series Corn Heads
Group 15 – 50, 50A Series Row-Crop Heads
SECTION 110 – FEEDER HOUSE REPAIR
Group 00 – Specifications and Special Tools
Group 05 – Feeder Conveyor Chain
Group 10 – Feeder Conveyor Drum
Group 15 – Feeder House Drives and Reverser Gear Case
Group 20 – Feeder House Drives (Side Hill 6620 Combines) (-610300)
Group 25 – Feeder House Paddies, Stripper, and Front Closure Sheets (Side Hill 6620 Combines) (-403300)
Group 30 – Feeder Conveyor Chain, Upper Shaft, Paddle and Shaft, Conveyor Drum and Front Closure Sheets (Side Hill 6620 Combines) (403301-)
SECTION 120 – SEPARATOR REPAIR
Group 00 – Specifications and Special Tools
Group 05 – Cylinder, Concave, and Beater
Group 10 – POST-TORQ Cylinder Drive
Group 12 – Dual-Range Cylinder Drive
Group 15 – Straw Walkers and Crankshafts
Group 20 – Straw Chopper and Straw Spreader
Group 25 – Shoe Augers, Fan, and Shoe Frame
Group 30 – Tailings Elevator and Augers
Group 35 – Lower Auger, Clean Grain Elevator, and Grain Tank Loading Auger
SECTION 130 – GRAIN TANK UNLOADING SYSTEM
Group 00 – Specifications
Group 05 – Grain Tank Cross Augers
Group 10 – Vertical Auger and Bevel Gears
Group 15 – Horizontal Auger and Gears
SECTION 140 – MAJOR DRIVES REPAIR
Group 00 – Specifications
Group 05 – Engine Power shaft
Group 10 – Primary Countershaft
Group 15 – Secondary Countershaft
SECTION 150 – SIDEWALL LEVELING SYSTEM REPAIR
Group 00 – Specifications and Special Tools
Group 05 – Electrical Components
Group 10 – Hydraulic Components
SECTION 160 – AUTOMATIC HEADER HEIGHT CONTROL REPAIR
Group 00 – Specifications and Special Tools
Group 05 – Repair of Components
SECTION 220 – ENGINE OPERATION AND TESTS
Group 00 – Specifications and Special Tools
Group 05 – System Operation
Group 10 – System Tests and Diagnosis
SECTION 230 – FUEL / AIR OPERATION AND TESTS
Group 00 – Specifications and Special Tools
Group 05 – Air Intake System
Group 10 – Diesel Fuel System
Group 15 – Control Linkage
SECTION 240 – ELECTRICAL OPERATION AND TESTS
Group 00 – Specifications and Special Tools
Group 05 – General Information and Diagnosis
Group 06 – Eletrical System Diagnosis
Group 10 – Charging Circuit
Group 15 – Starting Circuit
Group 20 – Lights, Instruments and Accessory Circuits
SECTION 250 – POWER TRAIN OPERATION AND TESTS
Group 00 – Specifications and Special Tools
Group 05 – Clutch Diagnosis
Group 10 – Transmission Diagnosis
Group 15 – Final Drive Diagnosis
Group 20 – Hydrostatic Drive Tests and Diagnosis
Group 25 – 4-Wheel Drive Diagnosis (Planetary Gearing)
Group 26 – 4-Wheel Drive (Cam Lobe)
Group 30 – Posi-Torq Ground Drive Diagnosis
SECTION 260 – STEERING / BRAKES OPERATION AND TESTS
Group 05 – Power Steering
Group 10 – Brakes
SECTION 270 – HYDRAULIC OPERATION AND TESTS
Group 00 – Specifications and Special Tools
Group 01 – Hydraulic System Operation
Group 05 – Hydraulic System Tests
Group 10 – Reservoir
Group 15 – Hydraulic Pumps
Group 20 – Hydraulic Valves
Group 25 – Hydraulic Cylinders
Group 30 – Hydraulic Motors
Group 35 – Accumulator
SECTION 290 – OPERATOR STATION OPERATION AND TESTS
Group 00 – Specifications and Special Tools
Group 05 – Air Conditioning System
Group 10 – Heating System
SECTION 350 – SIDEHILL LEVELING SYSTEM OPERATION AND TESTS
Group 00 – Specifications and Special Tools
Group 05 – General Information, Diagnosis, and Tests
Group 10 – Electrical System
Group 15 – Hydraulic System
SECTION 360 – AUTOMATIC HEADER HEIGHT CONTROL OPERATION AND TESTS
Group 00 – Specifications and Special Tools
Group 05 – General Information, Diagnosis, and Tests
Group 10 – Mechanical System
Group 15 – Electrical System
Group 20 – Hydraulic System
Group 25 – General Information, Diagnosis, and Tests
Group 30 – Mechanical System
Group 35 – Electrical System
Group 40 – Hydraulic System
And More……
John Deere 6620 7720 Service Repair Manual