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
00 – General Specifications
05 – Diagnosing and Testing Procedures
10 – Tune-Up and Adjustment
SECTION 20 – ENGINE REPAIR
00 – Specifications and Special Tools
05 – Cylinder Head, Valves and Camshaft
10 – Block, Liners, Pistons, and Rods
15 – Crankshaft and Main Bearings
20 – Lubrication System
25 – Cooling System
SECTION 30 – FUEL AND AIR REPAIR
00 – Specifications and Special Tools
05 – Air Intake System
10 – Diesel Fuel System
15 – Control Linkage
SECTION 40 – ELECTRICAL REPAIR
00 – Specifications and Special Tools
05 – Harness Replacement
10 – Charging Circuit Repair
15 – Starting Circuit Repair
20 – Lights, Instruments, and Accessories
John Deere 6620 7720 Service Repair Manual Manual
SECTION 50 – POWER TRAIN REPAIR
00 – Specifications and Special Tools
05 – Clutch
10 – Transmission
15 – Differential
20 – Final Drive
25 – Sunderland Hydrostatic Drive
26 – Eaton Hydrostatic Drive
30 – 4-Wheel Drive (Planetary Gearing)
31 – 4-Wheel Drive (Cam Lobe)
35 – Positron Ground Drive
40 – Tires and Wheels
SECTION 60 – STEERING / BRAKES REPAIR
00 – Specifications and Special Tools
05 – Power Steering
10 – Brakes
SECTION 70 – HYDRAULIC REPAIR
00 – Specifications
05 – Reservoir
10 – Hydraulic Pump
15 – Hydraulic Valves
20 – Hydraulic Cylinders
25 – Hydraulic Motors
30 – Accumulator
SECTION 80 – SEPARATOR SHELL REPAIR
00 – Specifications
05 – Rear Hood
10 – Cylinder Rear Cover
15 – Separator Uprights
SECTION 90 – OPERATOR STATION REPAIR
00 – Specifications and Special Tools
05 – Air Conditioning System
10 – Air Intake (Pressurizer) System
15 – Heating System
20 – Personal Posture Seat
25 – Miscellaneous Components
SECTION 100 – HEADER REPAIR
00 – Specifications and Special Tools
05 – 200 and 900 Series Cutting Platforms
10 – 40 Series Corn Heads
15 – 50, 50A Series Row-Crop Heads
SECTION 110 – FEEDER HOUSE REPAIR
00 – Specifications and Special Tools
05 – Feeder Conveyor Chain
10 – Feeder Conveyor Drum
15 – Feeder House Drives and Reverser Gear Case
20 – Feeder House Drives (Side Hill 6620 Combines) (-610300)
25 – Feeder House Paddies, Stripper, and Front Closure Sheets (Side Hill 6620 Combines) (-403300)
30 – Feeder Conveyor Chain, Upper Shaft, Paddle and Shaft, Conveyor Drum and Front Closure Sheets (Side Hill 6620 Combines) (403301-)
SECTION 120 – SEPARATOR REPAIR
00 – Specifications and Special Tools
05 – Cylinder, Concave, and Beater
10 – POST-TORQ Cylinder Drive
12 – Dual-Range Cylinder Drive
15 – Straw Walkers and Crankshafts
20 – Straw Chopper and Straw Spreader
25 – Shoe Augers, Fan, and Shoe Frame
30 – Tailings Elevator and Augers
35 – Lower Auger, Clean Grain Elevator, and Grain Tank Loading Auger
SECTION 130 – GRAIN TANK UNLOADING SYSTEM
00 – Specifications
05 – Grain Tank Cross Augers
10 – Vertical Auger and Bevel Gears
15 – Horizontal Auger and Gears
SECTION 140 – MAJOR DRIVES REPAIR
00 – Specifications
05 – Engine Power shaft
10 – Primary Countershaft
15 – Secondary Countershaft
SECTION 150 – SIDEWALL LEVELING SYSTEM REPAIR
00 – Specifications and Special Tools
05 – Electrical Components
10 – Hydraulic Components
SECTION 160 – AUTOMATIC HEADER HEIGHT CONTROL REPAIR
00 – Specifications and Special Tools
05 – Repair of Components
SECTION 220 – ENGINE OPERATION AND TESTS
00 – Specifications and Special Tools
05 – System Operation
10 – System Tests and Diagnosis
SECTION 230 – FUEL / AIR OPERATION AND TESTS
00 – Specifications and Special Tools
05 – Air Intake System
10 – Diesel Fuel System
15 – Control Linkage
SECTION 240 – ELECTRICAL OPERATION AND TESTS
00 – Specifications and Special Tools
05 – General Information and Diagnosis
06 – Eletrical System Diagnosis
10 – Charging Circuit
15 – Starting Circuit
20 – Lights, Instruments and Accessory Circuits
SECTION 250 – POWER TRAIN OPERATION AND TESTS
00 – Specifications and Special Tools
05 – Clutch Diagnosis
10 – Transmission Diagnosis
15 – Final Drive Diagnosis
20 – Hydrostatic Drive Tests and Diagnosis
25 – 4-Wheel Drive Diagnosis (Planetary Gearing)
26 – 4-Wheel Drive (Cam Lobe)
30 – Posi-Torq Ground Drive Diagnosis
SECTION 260 – STEERING / BRAKES OPERATION AND TESTS
05 – Power Steering
10 – Brakes
SECTION 270 – HYDRAULIC OPERATION AND TESTS
00 – Specifications and Special Tools
01 – Hydraulic System Operation
05 – Hydraulic System Tests
10 – Reservoir
15 – Hydraulic Pumps
20 – Hydraulic Valves
25 – Hydraulic Cylinders
30 – Hydraulic Motors
35 – Accumulator
SECTION 290 – OPERATOR STATION OPERATION AND TESTS
00 – Specifications and Special Tools
05 – Air Conditioning System
10 – Heating System
SECTION 350 – SIDEHILL LEVELING SYSTEM OPERATION AND TESTS
00 – Specifications and Special Tools
05 – General Information, Diagnosis, and Tests
10 – Electrical System
15 – Hydraulic System
SECTION 360 – AUTOMATIC HEADER HEIGHT CONTROL OPERATION AND TESTS
00 – Specifications and Special Tools
05 – General Information, Diagnosis, and Tests
10 – Mechanical System
15 – Electrical System
20 – Hydraulic System
25 – General Information, Diagnosis, and Tests
30 – Mechanical System
35 – Electrical System
40 – Hydraulic System
And More……
John Deere 6620 7720 Service Repair Manual