John Deere 670C, 670CH, 672CH, 770C, 770CH, 772CH Series II Motor Graders Diagnosis and Tests Manual

John Deere 670C, 670CH, 672CH, 770C, 770CH, 772CH Series II Motor Graders Diagnosis and Tests Manual (TM1914 05 AUG 09)

This technical diagnostic manual is tailored for advanced service of the John Deere 670C through 772CH Series II Motor Graders. It provides detailed diagnostic routines, component testing methods, hydraulic and electronic system troubleshooting, and system theory of operation. Coverage spans the engine, transmission, hydrostatic front wheel drive (HFWD), brake and steering systems, onboard monitoring, and A/C controls. Each section includes step-by-step procedures for verifying faults, running system-level tests, and interpreting error codes to ensure precision repairs.

Model Covers:

Graders models:

John Deere 672CH Series II Graders

John Deere 772CH Series II Graders

John Deere 670C Series II Graders

John Deere 670CH Series II Graders

John Deere 770C Series II Graders

John Deere 770CH Series II Graders

File Format: PDF

Size: 40.50 MB

No. of pages: 596

Language: English

Delivery Method: Instant Download – Access your file immediately after purchase.

📑 Included Sections:

General and Safety Information

• Safety procedures, ROPS inspection, chemical handling
• Start-up checks and machine pre-service protocols

Operational Checkout and Engine Systems

• Idle checks, diagnostic trouble code retrieval, rack actuator tests
• Fuel system, turbocharger, and throttle potentiometer diagnostics
• Boost, fuel flow, and manifold pressure testing

Electrical and Monitoring Systems

• System diagrams and connector locations
• Complete DTC troubleshooting and sub-circuit analysis
• TCU/HCU calibration, potentiometer and relay tests

Hydrostatic Front Wheel Drive (HFWD)

• Power flow logic, charge and leakage tests
• Planetary brake, flushing valve, solenoid, and multi-function valve testing

Transmission and Powertrain Diagnostics

• Clutch pack operation, park brake pressure and differential testing
• Transmission hydraulic control circuit tests and accumulator charging

Hydraulic and Braking Systems

• Blade lift, circle rotate, counterbalance, and steering control analysis
• Brake accumulator, system relief, and priority valve tests
• Cycle time and drift tests for system validation

Cab Heating and A/C Diagnostics

• R134a testing, expansion valve diagnostics
• Freeze control, clutch, and high/low pressure switch checks

For complete service information, also see:

120 Series Hydraulic Cylinders .......... TM-H120A
C Series II Motor Graders Repair .......... TM1915
PowerTech 8.1L Diesel Engines - Base Engine .......... CTM86
Alternators and Starting Motors .......... CTM77
TeamMate II 1200, 1400, and 1600 Series Inboard Planetary Axles .......... CTM43
PowerTech 4.5L & 6.8L Diesel Engines - Level 12 Electronic Fuel System with Stanadyne DE10 Pump .......... CTM331
Super Caddy Oil Cleanup Procedure .......... CTM310
PowerTech 4.5L & 6.8L Diesel Engines - Level 11 Electronic Fuel System with Denso HPCR .......... CTM220
PowerTech 6.8L and 8.1L, 6068 and 6081 Diesel Engines - Level 3 Electronic Fuel Systems with Bosch In-Line Pump .......... CTM134
PowerTech 4.5L & 6.8L Diesel Engines Tier 1/Stage I, Tier 2/Stage II, Tier 3/Stage IIIA, Tier 3/Stage IIA, Tier 3/Stage III (Base Engine) .......... CTM104

This John Deere Motor Graders Diagnosis and Tests Manual is a service-grade guide for technicians specializing in electronic diagnostics, mechanical validation, and fluid pressure calibration for advanced grader models.