John Deere 770G, 770GP, 772G, 772GP Operation and Test Manual
John Deere 770G, 770GP, 772G, 772GP Grader Manual
John Deere 770G, 770GP, 772G, 772GP Operation and Test Manual – Complete Diagnostic, Calibration & Performance Guide
We present a high-precision John Deere Operation and Test Manual resource for the John Deere 770G, 770GP, 772G, and 772GP Motor Graders, designed for advanced diagnostics, system testing, calibration, and performance validation. This guide is structured for field service technicians, diagnostic specialists, and dealership-level mechanics who require accurate testing procedures and OEM-level operational data.
Scope of the Operation and Test Manual
This manual focuses exclusively on machine performance verification and system diagnostics, covering:
- Operational checks and functional testing
- Hydraulic and powertrain performance validation
- Electronic control system diagnostics
- Pressure, flow, and sensor calibration
- Troubleshooting using test-based logic
Unlike standard repair manuals, this document is used to identify faults before disassembly, reducing downtime and unnecessary repairs.
John Deere 770G, 770GP, 772G, 772GP – Complete Diagnostic, Calibration & Performance Guide
Operation and Test Manual – (TM12139)
Section 9000—General Information
Group 01—Safety
Section 9001—Diagnostics
Group 10—PCU Diagnostic Trouble Codes
Group 20—ECU Diagnostic Trouble Codes
Group 30—ADU Diagnostic Trouble Codes
Group 40—FLC Diagnostic Trouble Codes
Group 50—HVC Diagnostic Trouble Codes
Group 60—AVC Diagnostic Trouble Codes
Group 70—OC3 Diagnostic Trouble Codes
Group 80—HWD Diagnostic Trouble Codes
Group 90—LJ1 Diagnostic Trouble Codes
Group 100—LJ2 Diagnostic Trouble Codes
Group 110—LJ3 Diagnostic Trouble Codes
Group 120—LJ4 Diagnostic Trouble Codes
Group 130—RJ1 Diagnostic Trouble Codes
Group 140—RJ2 Diagnostic Trouble Codes
Group 150—RJ3 Diagnostic Trouble Codes
Group 160—RJ4 Diagnostic Trouble Codes
Section 9005—Operational Checkout Procedure
Group 10—Operational Checkout Procedure
Section 9010—Engine
Group 05—Theory of Operation
Group 15—Diagnostic Information
Group 20—Adjustments
Group 25—Tests
Section 9015—Electrical System
Group 05—System Information
Group 10—System Diagrams
Group 15—Sub-System Diagnostics
Group 16—Monitor Operation
Group 20—References
Section 9016—Six Wheel Drive (6WD)
Group 05—Theory of Operation
Group 15—Diagnostic Information
Group 20—Adjustments
Group 25—Tests
Section 9020—Power Train
Group 05—Theory of Operation
Group 15—Diagnostic Information
Group 25—Tests
Section 9025—Hydraulic System
Group 05—Theory of Operation
Group 15—Diagnostic Information
Group 25—Tests
Section 9031—Heating and Air Conditioning
Group 05—Theory of Operation
Group 15—Diagnostic Information
Group 25—Tests