Part of the John Deere Repair Manuals.
This is the complete John Deere factory operation, tests and diagnosis manual for the 6215, 6415, 6615 and 6715 tractors. Across 2,515 pages it covers every diagnostic and testing procedure a technician needs to work on this family: reading BCU and ECU trouble codes, running the symptom-based diagnostic trees, performing electrical component tests with exact voltage and resistance values, and executing tests and adjustments on the engine, all three available transmissions, hydraulic system and steering. Each major section includes a theory-of-operation overview alongside the step-by-step test procedures and functional schematics, so you can understand what the system should do before testing it. Wiring harnesses are documented in full, including a separate set for tractors from serial number 398656 onward.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | Safety Measures, General References | |
| Diagnostic Codes | Bcu Diagnostic Trouble Codes, ECU Diagnostic Trouble Codes | |
| System Diagnostics | Electronics Diagnostics | |
| Engine | Functional Tests, Tests and Adjustments | |
| Fuel, Air Intake and Cooling Systems | Tests and Adjustments, Theory of Operation | |
| Electrical System | Sub-System Diagnostics (Cab), Sub-System Diagnostics (Open Operator Station), Component Testing, Functional Schematics (Cab), Functional Schematics (Open Operator Station), Wiring Harnesses, Wiring Harnesses From Serial Number 398656 | |
| Electronic Control Units | Operation and General Information, Data Bus Systems Diagnosis, Bcu - Basic Control Unit, ECU - Engine Control Unit | |
| SyncroPlus Transmission | Preliminary Checks, Functional Tests, Tests and Adjustments, Theory of Operation | |
| PowrReverser Transmission | Functional Tests, Forward-Reverse Clutch Tests, Tests and Settings, Theory of Operation | |
| PowrQuad and Range Transmission | Functional Tests, Clutch-to-Clutch Shift Tests, Modulated Clutch Pressure Tests, Tests and Settings, Theory of Operation | |
| Power Train (Without Transmission) | Functional Tests, Tests and Adjustments, Theory of Operation | |
| Steering and Brakes | Introductory Checks, Operational Check-Out, Tests and Adjustments, Theory of Operation | |
| HydrAdvantage Hydraulic System | Operational Check-Out, Tests and Adjustments, Theory of Operation | |
| Operator Cab | Operator Station Check-Out, Climate Control Tests, HVAC Adjustments, Cab Pressurization Tests | |
| Special Tools | Dealer-Fabricated Special Tools, Special Tools and Test Equipment |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| BCU Operating Voltage (ignition ON, engine OFF) | 11.2 to 12.7 volts | |
| BCU Operating Voltage (engine at 1500 rpm) | 12.5 to 15.4 volts | |
| Rear PTO Solenoid (Y04) Resistance at Coil | 10-12 ohms at 20 degrees C (68 degrees F) | |
| Rear PTO Solenoid (Y04) Voltage - PTO Disengaged | 0 volts | |
| Rear PTO Solenoid (Y04) Voltage - PTO Engaged | 12 volts | |
| Rear PTO Solenoid (Y04) Current Draw - PTO Engaged | 1.0 to 1.2 amps at 20 degrees C (68 degrees F) | |
| Differential Lock Solenoid (Y05) Resistance at Coil | 10-12 ohms at 20 degrees C (68 degrees F) | |
| Differential Lock Solenoid (Y05) Current Draw - Engaged | 1.0 to 1.2 amps at 20 degrees C (68 degrees F) |
