John Deere 7820 Manual

7720, 7820 and 7920 Tractors Operation and Test

TECHNICAL MANUAL 7720, 7820 and 7920 Tractors Operation and Test TM2025 20NOV09

For complete service information also see: 7720, 7820 and 7920 Tractors Repair ...................................................................

TM2080

PowerTech, PowerTech Plus, and PowerTech E 4.5L and 6.8L Diesel Engines ­ Base Engine ....

CTM104

PowerTech 4.5L and 6.8L Diesel Engines Level 11 Electronic Fuel System with Denso HPCR...

CTM220

Power Tech 8.1L Diesel Engines Base Engine ..

CTM86

PowerTech 8.1L Diesel Engines Level 9 Electronic Fuel System with Denso HPCR........

CTM255

OEM Engine Accessories ...................................

CTM67

Alternators and Starting Motors ........................

GreenStar 2 Diagnosis and Tests Manual .........

CTM77 TM1061

Original GreenStar (AMS) Diagnosis and Tests Manual ..................................................................

Real Time Kinematics (RTK) Base Station Diagnosis and Tests............................................

TM2240 TM2820

John Deere Waterloo LITHO Works IN U.S.A.

(ENGLISH)

Introduction Foreword This manual is written for an experienced technician.

Essential tools required in performing certain service work are identified in this manual and are recommended for use.

Live with safety: Read the safety messages in the introduction of this manual and the cautions presented throughout the text of the manual.

This is the safety­alert symbol. When you see this symbol on the machine or in this manual, be alert to the potential for personal injury.

Technical manuals are divided in two parts: repair and operation and tests. Repair sections tell how to repair the components. Operation and tests sections help you identify the majority of routine failures quickly.

Information is organized in groups for the various components requiring service instruction. At the beginning of each group are summary listings of all applicable essential tools, service equipment and tools, other materials needed to do the job, service parts kits, specifications, wear tolerances, and torque values.

Technical Manuals are concise guides for specific machines. They are on­the­job guides containing only the vital information needed for diagnosis, analysis, testing, and repair.

Fundamental service information is available from other sources covering basic theory of operation, fundamentals of troubleshooting, general maintenance, and basic type of failures and their causes.

DX,TMIFC ­19­29SEP98­1/1

TM2025 (20NOV09)

7720, 7820 and 7920 Tractors 121609 PN=2

Contents Section 210—GENERAL

Group 56B—MFWD Group 56C—Front PTO Group 56D—Rear PTO Group 56E—Suspended Front Axle Group 60A—Rear Brake Group 60B—Steering Group 60C—Front Brake System Diagnosis Group 60D—Hydraulic Trailer Brake System Diagnosis Group 60E—Air Trailer Brake System Diagnosis Group 60F—AutoTrac System Group 70—Hydraulic System Diagnosis Group 70A—Rear Electrohydraulic SCV System Diagnosis Group 70B—Mid­Stack Electrohydraulic SCV System Diagnosis Group 70C—Rear Hitch System Diagnosis Group 70D—Front Hitch System Diagnosis Group 70E—Mid­Stack Mechanical SCV System Diagnosis Group 90A—ClimaTrak™ (ATC) Group 90B—Active Seat Group 90C—Manual Seat Group 90D—Manual Air Conditioning Group 90E—Wiper System Group 90F—Heated Seat

Group 05—Safety Group 10—General Specifications Group 15—General References

Section 211—DIAGNOSTIC TROUBLE CODES Group Group Group Group Group Group Group Group Group Group Group Group Group Group Group Group Group Group

ACU—ACU Code Diagnostics ASU—ASU Code Diagnostics ATC—ATC Code Diagnostics CAB—CAB Code Diagnostics CCU—CCU Code Diagnostics ECU—ECU Code Diagnostics FBC—FBC Code Diagnostics HCU—HCU Code Diagnostics ICU—ICU Code Diagnostics PTF—PTF Code Diagnostics PTI—PTI Code Diagnostics PTQ—PTQ Code Diagnostics SCO—SCO Code Diagnostics SCU—SCU Code Diagnostics SFA—SFA Code Diagnostics SSU—SSU Code Diagnostics SUP—SUP Code Diagnostics TEC—TEC Code Diagnostics

Section 220—ENGINES

Section 212—OBSERVABLE SYMPTOMS

Group 05—General Information Group 10—Operational Checks Group 15—Test And References Group 20—Engine System Theory of Operation Group 25—Schematics and Diagrams

Group 20—Engines Group 30—Fuel and Air Group 40—Electrical Group 45—Control Units Group 51—AutoPowr / IVT™ Transmissions Group 55—PowrQuad­Plus and AutoQuad­Plus Transmissions Group 56—Drive Systems Group 60—Steering and Brakes Group 70—Hydraulics Group 90—Operator Station

Section 230—FUEL AND AIR Group 20—Fuel and Air Theory of Operation

Section 240—ELECTRICAL Group 05—Load Center Fuses and Relays Group 10—Operational Checks Group 15—Tests and Adjustments Group 20—Theory Of Operation Group 25—Functional Schematics Group 30—Connector Information

Section 213—SYSTEM DIAGNOSIS Group 40A—North American Lighting Group 40B—European Lighting Group 40C—Starting, Charging and Start Aid Group 45—CAN System Diagnosis Group 51—AutoPowr / IVT™ TRANSMISSION Group 55—PowrQuad­Plus / AutoQuad­Plus Transmission Group 56A—Differential Lock

Section 245—CONTROL UNITS Group 05—General References Group 15—Tests and Adjustments Group ACU—ACU Continued on next page

Original Instructions. All information, illustrations and specifications in this manual are based on the latest information available at the time of publication.

The right is reserved to make changes at any time without notice.

COPYRIGHT © 2009 DEERE & COMPANY Moline, Illinois All rights reserved.

A John Deere ILLUSTRUCTION ® Manual Previous Editions Copyright © 2003, 2004, 2005, 2006, 2008

TM2025 (20NOV09)

i

7720, 7820 and 7920 Tractors 121609 PN=1

Contents Group Group Group Group Group Group Group Group Group Group Group Group Group Group Group Group

ASU—ASU ATC—ATC CAB—CAB CCU—CCU FBC—FBC HCU—HCU ICU—ICU PTF—PTF PTI—PTI PTQ—PTQ SCO—SCO SCU—SCU SFA—SFA SSU—SSU SUP—SUP TEC—TEC

Section 299—SERVICE TOOLS Group 05—Dealer Fabricated Tools Group 10—Service Tools and Kits

Section 251—AutoPowr / IVT TRANSMISSION Group 05—General Information Group 10—Operational Checks Group 15—Test And Procedure References Group 20—AutoPowr / IVT Theory of Operation Group 25—AutoPowr / IVT™ Transmission Schematics and Diagrams

Section 255—PowrQuad­Plus and AutoQuad­Plus Transmission Group 05—General Information Group 10—Operational Checks Group 15—Tests and Adjustments Group 20—PowrQuad­Plus and AutoQuad­Plus Theory of Operation Group 25—Schematics and Diagrams

Section 256—DRIVE SYSTEMS Group 10—Preliminary And Operational Checks Group 15—Test References Group 20—Theory Of Operation Group 25—Schematics and Diagrams

Section 260—STEERING AND BRAKES Group 05—Preliminary Checks Group 10—Preliminary And Operational Checks Group 15—Test And Adjustments Group 20—Theory Of Operation Group 25—Schematics and Diagrams

Section 270—HYDRAULICS Group 05—General References Group 10—Operational and Preliminary Checks Group 15—Tests and Adjustments Group 20—Theory Of Operation Group 25—Schematics and Diagrams

Section 290—OPERATOR STATION Group Group Group Group Group

05—Preliminary Checks 10—Operational Checks 15—Tests and Adjustments 20—Theory Of Operation 25—Schematics and Diagrams

TM2025 (20NOV09)

ii

7720, 7820 and 7920 Tractors 121609 PN=2

Contents

Section 210 GENERAL

Page

Group 05—Safety ......................................210­05­1 Group 10—General Specifications Reference 210­10­001, General Specifications .......................................... 210­10­1 Reference 210­10­002, General Reference List ......................................... 210­10­2 Group 15—General References Specifications .............................................. 210­15­1 Reference 210­15­002, Bolt and Cap Screw Torque Values ....................... 210­15­2 Reference 210­15­003, Glossary of Terms................................................... 210­15­4 Reference 210­15­004, JIC Hydraulic Symbols................................... 210­15­8 Reference 210­15­005, Wiring Diagram and Schematic Information............................................. 210­15­10 Reference 210­15­006, Electrical Schematic Symbols ............................... 210­15­12 Reference 210­15­007, Reading Wiring Schematics and Diagrams ............................................... 210­15­14 Reference 210­15­008, Visually Inspect Electrical System ...................... 210­15­17 Reference 210­15­009, Seven Step Electrical Procedure1 ..................... 210­15­18 Reference 210­15­010, Using a Probe Light ............................................ 210­15­20 Reference 210­15­011, Circuit Types ..................................................... 210­15­21 Reference 210­15­012, Circuit Malfunctions .......................................... 210­15­23 Reference 210­15­013, Troubleshooting Circuit Malfunctions .......................................... 210­15­26 Reference 210­15­014, Understanding Electrical vs.

Electronic Circuits.................................. 210­15­30 Reference 210­15­015, Intermittent Electronic Problems............................... 210­15­32 Reference 210­15­016, Relay Circuit Types.......................................... 210­15­35 Reference 210­15­017, Using a Digital Multimeter................................... 210­15­48 Reference 210­15­101, Troubleshooting Unresolved Problems ............................................... 210­15­49

TM2025 (20NOV09)

210­1

7720, 7820 and 7920 Tractors 121609 PN=1

Thank you very much for your reading.

Please click here to get more information.