John Deere 6620, 7720, 8820 and SideHill 6620 Combines Technical Manual (TM1202)

Illustrated factory Technical Manual for John Deere Combines Models 6620, 7720, 8820 and SideHill Combines Models 6620.

This manual will assist you in diagnosing, and repairing for your combine.
You can use a Windows, Mac, or Android device to view this manual. You only need to have a PDF reader installed.

Covered Models:
   6620
   7720
   8820
   SideHill 6620

Format: PDF, 1922 pages
Language: English
Publication Date: 01 Jan 1988
Table of Contents:
   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
      Lubrication System
      Cooling System
   FUEL AND AIR REPAIR
      Specifications and Special Tools
      Air 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
      Accumulator
   SEPARATOR SHELL REPAIR
      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 Closure 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
      Starting 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
      Hydraulic Motors
      Accumulator
   OPERATOR STATION OPERATION AND TESTS
      Specifications and Special Tools
      Air 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
      General 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

Covered
Models	6620, 7720, 8820, SIDEHILL COMBINES MODELS 6620