Part of the John Deere Repair Manuals.
This is the John Deere factory Operation and Tests manual (TM4741) for the 6020, 6120, 6220, 6320, 6420, 6420S, 6520, 6620, 6820, 6920 and 6920S SE tractors. Unlike the companion repair manual, it focuses on theory of operation, test procedures, diagnostic routines and system adjustments rather than disassembly and rebuild. Across 3,476 pages it covers five transmission variants, the load-sensing hydraulic system, electronic control unit diagnostics, electrical sub-system checks and grounded test pressures for cooling, fuel and air intake. It is what a John Deere dealer technician reaches for to confirm system performance to factory spec before deciding whether a component needs repair.
What's Inside This John Deere 6020-6920S Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | Safety Information, Specifications, Torque Values, Fuel and Lubricant Recommendations | |
| Engine | Theory of Operation, Engine Performance Diagnosis, Tests and Adjustments | |
| Fuel, Air Intake and Cooling Systems | Cooling System Pressure Tests, Air Intake Restriction Tests, Fuel System Pressure Tests, Thermostat Testing, Viscous Fan Drive Tests, Fuel Transfer Pump Flow Rate | |
| Electrical System | Battery and Charging Tests, Wiring Harness and Connector Checks, Gauges and Instrument Diagnostics, Alternator and Starting Motor Tests | |
| Electronic Control Units | ECU Diagnostics, Error Code Reading and Clearing, CAN Bus Tests, Bosch VP44 Injection Pump Control | |
| SyncroPlus Transmission | Theory of Operation, Tests and Adjustments, Shift Quality Diagnosis | |
| Power Reverser | Theory of Operation, Tests and Adjustments | |
| AutoPowr/IVT Transmission | Theory of Operation, CVT Diagnostics, Tests and Adjustments | |
| PowrQuad, PowrQuad Plus and AutoQuad Transmissions | Theory of Operation, Shift Quality Diagnosis, Tests and Adjustments | |
| Drive Systems | Differential Lock Tests, MFWD Tests and Adjustments | |
| Steering and Brakes | Power Steering Pressure Tests, Brake Adjustment and Tests | |
| Hydraulic System | Hydraulic Pressure Tests, Load-Sensing System Checks, Selective Control Valve Tests, Pump Flow Tests | |
| Miscellaneous | PTO Tests, General Diagnostic Procedures | |
| Operator's Cab | Air Conditioning Diagnostics, Cab Electrical Sub-System Checks | |
| Special Tools | Tool Identification and Application |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All models | ||
| Cooling System Test Pressure | 50-60 kPa (0.5-0.6 bar / 7-8.7 psi) | |
| Expansion Tank Cap High-Pressure Valve Opening | 70-90 kPa (0.7-0.9 bar / 10-13 psi) | |
| Expansion Tank Cap Low-Pressure Valve Opening | 10 kPa (0.1 bar / 1.5 psi) | |
| Air Intake System Test Pressure (restriction limit) | 1.5 kPa (15 mbar / 0.22 psi) | |
| Air Intake Low-Pressure Switch Range | 5.6-6.4 kPa (56-64 mbar / 0.81-0.93 psi) | |
| Fuel System Feed Pressure | 15 kPa (0.15 bar / 2.18 psi) | |
| Thermostat Initial Opening (82 degrees C rated) | 80-84 degrees C (175-182 degrees F) | |
| Level II emission engines | ||
| Fuel Transfer Pump Flow Rate (Level II engine) | 100 L/hr (26.4 US gal/hr) | |
| 82 degrees C rated thermostat | ||
| Thermostat Fully Open | 94 degrees C (202 degrees F) | |
| Models with viscous fan drive | ||
| Viscous Fan Drive - Minimum Speed at Slow Idle (850-900 rpm) | 800 rpm (may drop to 600 rpm for ~30 s) | |
| Level II/12 engines with VP44 pump | ||
| ECU Engine Speed Reduction Threshold (Bosch VP44 fuel cooler) | Above 70 degrees C (158 degrees F) fuel temperature | |
| Optional coolant heater | ||
| Coolant Heater Output | 650 W at 230 V | |
