John Deere 7720 7820 7920 Tractors Diagnostic & Test Service Manual TM2025 PDF - MJODTM2025.zip
A full Diagnostics and Tests service manual, complete with electrical schematics, covering John Deere 7720, 7820 and 7920 tractors — containing every piece of shop data needed to service, troubleshoot, and overhaul these machines the way expert technicians do.
The Diagnosis & Tests technical manual for John Deere 7720, 7820 and 7920 two-wheel-drive or MFWD tractors covers the following:
* Numbered table of contents easy to use so that you can find the information you need fast.
* Detailed sub-steps expand on repair procedure information
* Numbered instructions guide you through every repair procedure step by step.
* Troubleshooting and electrical service procedures are combined with detailed wiring diagrams for ease of use.
* Notes, cautions and warnings throughout each chapter pinpoint critical information.
* Bold figure number help you quickly match illustrations with instructions.
* Detailed illustrations, drawings and photos guide you through every procedure.
* Enlarged inset helps you identify and examine parts in detail.
tm2025 - 7720, 7820 and 7920 Tractors Operation and Test Technical Manual.pdf
tm2025 - 7720, 7820 and 7920 Tractors Operation and Test Technical Manual.epub
Total Pages: 1,130 pages
File Format: PDF/EPUB/MOBI/AZW (PC/Mac/Android/Kindle/iPhone/iPad; bookmarked, ToC, Searchable, Printable)
Language: English
MAIN SECTIONS
Foreword
GENERAL
Safety
General Specifications
General References
DIAGNOSTIC TROUBLE CODES
ACU Code Diagnostics
ASU Code Diagnostics
ATC Code Diagnostics
CAB Code Diagnostics
CCU Code Diagnostics
ECU Code Diagnostics
FBC Code Diagnostics
HCU Code Diagnostics
ICU Code Diagnostics
PTF Code Diagnostics
PTI Code Diagnostics
PTQ Code Diagnostics
SCO Code Diagnostics
SCU Code Diagnostics
SFA Code Diagnostics
SSU Code Diagnostics
SUP Code Diagnostics
TEC Code Diagnostics
OBSERVABLE SYMPTOMS
Engines
Fuel and Air
Electrical
Control Units
AutoPowr / IVTIVT is a trademark of Deere & Company
Transmissions
PowrQuad-Plus and AutoQuad-Plus Transmissions
Drive Systems
Steering and Brakes
Hydraulics
Operator Station
SYSTEM DIAGNOSIS
North American Lighting
European Lighting
Starting, Charging and Start Aid
CAN System Diagnosis
AutoPowr / IVTIVT is a trademark of Deere & Company
TRANSMISSION
PowrQuad-Plus / AutoQuad-Plus Transmission
Differential Lock
MFWD
Front PTO
Rear PTO
Suspended Front Axle
Rear Brake
Steering
Front Brake System Diagnosis
Hydraulic Trailer Brake System Diagnosis
Air Trailer Brake System Diagnosis
AutoTrac System
Hydraulic System Diagnosis
Rear Electrohydraulic SCV System Diagnosis
Mid-Stack Electrohydraulic SCV System Diagnosis
Rear Hitch System Diagnosis
Front Hitch System Diagnosis
Mid-Stack Mechanical SCV System Diagnosis
ClimaTrak™ (ATC)
Active Seat
Manual Seat
Manual Air Conditioning
Wiper System
Heated Seat
ENGINES
General Information
Operational Checks
Test And References
Engine System Theory of Operation
Schematics and Diagrams
FUEL AND AIR
Fuel and Air Theory of Operation
ELECTRICAL
Load Center Fuses and Relays
Operational Checks
Tests and Adjustments
Theory Of Operation
Functional Schematics
Connector Information
CONTROL UNITS
General References
Tests and Adjustments
ACU
ASU
ATC
CAB
CCU
FBC
HCU
ICU
PTF
PTI
PTQ
SCO
SCU
SFA
SSU
SUP
TEC
AutoPowr / IVT TRANSMISSION
General Information
Operational Checks
Test And Procedure References
AutoPowr / IVT Theory of Operation
AutoPowr / IVTIVT is a trademark of Deere & Company
Transmission Schematics and Diagrams
PowrQuad-Plus and AutoQuad-Plus Transmission
General Information
Operational Checks
Tests and Adjustments
PowrQuad-Plus and AutoQuad-Plus Theory of Operation
Schematics and Diagrams
DRIVE SYSTEMS
Preliminary And Operational Checks
Test References
Theory Of Operation
Schematics and Diagrams
STEERING AND BRAKES
Preliminary Checks
Preliminary And Operational Checks
Test And Adjustments
Theory Of Operation
Schematics and Diagrams
HYDRAULICS
General References
Operational and Preliminary Checks
Tests and Adjustments
Theory Of Operation
Schematics and Diagrams
OPERATOR STATION
Preliminary Checks
Operational Checks
Tests and Adjustments
Theory Of Operation
Schematics and Diagrams
SERVICE TOOLS
Dealer Fabricated Tools
Service Tools and Kits
tm2025 - 7720, 7820 and 7920 Tractors Operation and Test
Table of Contents
Foreword
Section 210: GENERAL
Group 05: Safety
Recognize Safety Information
Handle Fluids Safely—Avoid Fires
Prevent Battery Explosions
Prepare for Emergencies
Prevent Acid Burns
Handle Agricultural Chemicals Safely
Avoid High-Pressure Fluids
Park Machine Safely
Support Machine Properly
Wear Protective Clothing
Work in Clean Area
Service Machines Safely
Work In Ventilated Area
Illuminate Work Area Safely
Replace Safety Signs
Use Proper Lifting Equipment
Remove Paint Before Welding or Heating
Avoid Heating Near Pressurized Fluid Lines
Keep ROPS Installed Properly
Avoid Harmful Asbestos Dust
Practice Safe Maintenance
Use Proper Tools
Dispose of Waste Properly
Prevent Machine Runaway
Handle Starting Fluid Safely
Service Cooling System Safely
Stay Clear of Rotating Drivelines
Protect Against High Pressure Spray
Construct Dealer-Made Tools Safely
Clean Vehicle of Hazardous Pesticides
Live With Safety
Group 10: General Specifications
Reference 210-10-001, General Specifications
Reference 210-10-002, General Reference List
Group 15: General References
Specifications
Reference 210-15-002, Bolt and Cap Screw Torque Values
Reference 210-15-003, Glossary of Terms
Reference 210-15-004, JIC Hydraulic Symbols
Reference 210-15-005, Wiring Diagram and Schematic Information
Reference 210-15-006, Electrical Schematic Symbols
Reference 210-15-007, Reading Wiring Schematics and Diagrams
Reference 210-15-008, Visually Inspect Electrical System
Reference 210-15-009, Seven Step Electrical Procedure With probe light or multimeter
Reference 210-15-010, Using a Probe Light
Reference 210-15-011, Circuit Types
Reference 210-15-012, Circuit Malfunctions
Reference 210-15-013, Troubleshooting Circuit Malfunctions
Reference 210-15-014, Understanding Electrical vs. Electronic Circuits
Reference 210-15-015, Intermittent Electronic Problems
Reference 210-15-016, Relay Circuit Types
Reference 210-15-017, Using a Digital Multimeter
Reference 210-15-101, Troubleshooting Unresolved Problems
Section 211: DIAGNOSTIC TROUBLE CODES
Group ACU: ACU Code Diagnostics
ACU 000158.04 - Rear PTO Switched Supply Voltage Low
ACU 000177.17 - Engine Speed Limited Due to Cold Oil
ACU 000237.02 - VIN Security Data Conflict
ACU 000237.14 - VIN Security Not Enabled
ACU 000237.31 - VIN Security Messages Missing
ACU 000581.07 - Transmission Not Responding to Command
ACU 000587.31 - Engine Type Unknown
ACU 000628.02 - ACU EOL Data Fault
ACU 000628.12 - ACU Programming
ACU 000629.11 - ACU Control Unit Fault
ACU 000629.12 - ACU Control Unit Fault
ACU 000630.02 - ACU Calibration Fault/Data Invalid
ACU 000630.13 - ACU Calibration Fault/Not Calibrated
ACU 000974.02 - Hand Throttle Sensor Circuit Voltage Conflict
ACU 000974.03 - Hand Throttle Sensor Circuit Voltage High
ACU 000974.04 - Hand Throttle Sensor Circuit Voltage Low
ACU 001079.02 - ACU Sensor Supply 1 Voltage Fault
ACU 001079.03 - ACU Sensor Supply 1 Voltage High
ACU 001079.04 - ACU Sensor Supply 1 Voltage Low
ACU 001080.02 - ACU Sensor Supply 2 Voltage Fault
ACU 001080.03 - ACU Sensor Supply 2 Voltage High
ACU 001080.04 - ACU Sensor Supply 2 Voltage Low
ACU 002000.09 - ECU Message Missing
ACU 002003.09 - PTI or PTP Message Missing
ACU 002049.09 - CAB Message Missing
ACU 523664.02 - Speed Band 1 and 2 Switches Conflict
ACU 523923.02 - SCV I Control Lever Switch/Sensor Conflict
ACU 523923.03 - SCV I Control Lever Sensor Circuit Voltage High
ACU 523923.04 - SCV I Control Lever Sensor Circuit Voltage Low
ACU 523953.02 - Speed Control Lever Sensor Circuit Conflict
ACU 523953.03 - Speed Control Lever Sensor Voltage High
ACU 523953.04 - Speed Control Lever Sensor Voltage Low
ACU 523954.07 - Speed Band 1 out of Adjustment
ACU 523954.11 - Set Speed Adjuster Conflict
ACU 523955.31 - Engine Overload
ACU 523958.31 - Reversing Ratio Fault
ACU 523960.17 - Operator Not Present At Low Speeds
ACU 523960.31 - Operator Not Seated During Reverser Command
ACU 523961.02 - Park Engaged While in Gear
ACU 523961.07 - Park Lock Engagement Fault
ACU 523962.31 - MFWD Speed Incorrect
ACU 523963.02 - Speed Band 1 Switch/Voltage Conflict
ACU 523966.02 - Transmission Come Home Mode
ACU 523967.02 - Speed Band 2 Switch/Voltage Conflict
ACU 523968.02 - IMS Switch Circuits Conflict
ACU 523968.03 - IMS Switch Circuits Voltage High
ACU 523968.04 - IMS Switch Circuits Voltage Low
ACU 523969.11 - Upshift/Downshift Switch Conflict
ACU 524212.02 - Rear Hitch Control Lever Switch/Sensor Circuit Conflict
ACU 524212.03 - Rear Hitch Control Lever Sensor Circuit Voltage High
ACU 524212.04 - Rear Hitch Control Lever Sensor Circuit Voltage Low
ACU 524020.31 - Transmission In Gear at Power Up
ACU 524103.02 - SCV IV Control Lever Switch/Sensor Circuit Conflict
ACU 524103.03 - SCV IV Control Lever Sensor Circuit Voltage High
ACU 524103.04 - SCV IV Control Lever Sensor Circuit Voltage Low
ACU 524104.02 - SCV III Control Lever Switch/Sensor Circuit Conflict
ACU 524104.03 - SCV III Control Lever Sensor Circuit Voltage High
ACU 524104.04 - SCV III Control Lever Sensor Circuit Voltage Low
ACU 524105.02 - SCV II Control Lever Switch/Sensor Circuit Conflict
ACU 524105.03 - SCV II Control Lever Sensor Circuit Voltage High
ACU 524105.04 - SCV II Control Lever Sensor Circuit Voltage Low
ACU 524224.02 - Rear PTO Switch Circuit Conflict
ACU 524224.14 - Rear PTO Disabled
ACU 524254.31 - Transmission Enable Relay Circuit Fault
Group ASU: ASU Code Diagnostics
ASU 000153.03 - ASU Switched Supply Voltage High
ASU 000158.04 - ASU Switched Supply Voltage Low
ASU 000628.02 - ASU EOL Data Fault
ASU 000628.12 - ASU Programming
ASU 000629.11 - ASU Control Unit Fault
ASU 000629.12 - ASU Control Unit Fault
ASU 000639.12 - ASU CAN Message Overflow
ASU 000639.14 - ASU CAN Error Limit Exceeded
ASU 001079.03 - ASU Sensor Supply Voltage High
ASU 001079.04 - ASU Sensor Supply Voltage Low
ASU 524002.31 - Seat Pressure Control Solenoid Fault
ASU 524003.02 - Seat Firmness Control Switch Circuit Fault
ASU 524004.02 - Seat Height Control Switch Circuit Fault
ASU 524006.30 - Seat Vent ON Too Long
ASU 524007.30 - Seat Compressor Assembly ON Too Long
ASU 524008.13 - ASU Not Calibrated
ASU 524010.31 - Seat Raise / Lower Solenoid Circuit Fault
ASU 524011.03 - Seat Accelerometer Circuit Voltage High