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Part of the John Deere Repair Manuals.
This is the complete John Deere factory Diagnosis and Tests Service Manual (TM4733) for the 6120, 6220, 6320, 6420, 6120L, 6220L, 6320L, 6420L and 6520L tractors. Across 2,199 pages it gives you every tool a John Deere dealer technician needs to find a fault before touching a wrench: a full diagnostic trouble code (DTC) library organized by controller, observable-symptom fault trees that start from what the machine is doing rather than a code, and system-level diagnostic procedures with test pressures, voltage limits and calibration steps for every major system. Coverage spans all five available transmission families, MFWD, hydraulics, steering, brakes, the CAN electronics network and the ClimaTrak HVAC system.
What's Inside This John Deere 6120, 6220, 6320, 6420, 6120L, 6220L, 6320L, 6420L, 6520L Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | Safety, General Specifications, Software Version Reference, Abbreviations, Diagnostic Tool Setup | |
| Diagnostic Trouble Codes | Engine Dtc List, Transmission Dtc List, Hydraulic Dtc List, ATC/ClimaTrak Dtc List, Epc Codes, Sfa Codes, Code Deletion Procedures | |
| Observable Symptoms | Symptom-Based Fault Trees, Starting Faults, Power Loss, Transmission Shift Complaints, Hydraulic Performance Loss, PTO Faults | |
| Engine | Engine Controller Diagnostics, Fuel System Pressure Tests, Cooling System Tests, Turbocharger Diagnostics, Injection System Fault Isolation | |
| Electrical System | Wiring Harness Tests, Connector Inspection, Voltage and Resistance Checks, Fuse and Relay Diagnostics, Charging System Tests | |
| SyncroPlus Transmission | Shift Quality Diagnostics, Clutch Engagement Faults, Range Selection Fault Isolation, Pressure Tests | |
| Power Reverser Transmission | Reverser Clutch Diagnostics, Dtc Fault Isolation, Pressure Test Procedures, Calibration Steps | |
| AutoPowr/IVT Transmission | Infinitely Variable Transmission Diagnostics, Control Valve Tests, Speed Sensor Checks, Calibration Procedures, IVT Dtc Fault Trees | |
| PowrQuad, PowrQuad Plus and AutoQuad Transmissions | Powershift Clutch Diagnostics, Pressure Tests, Solenoid Testing, Clutch Pack Fault Isolation | |
| Drive Systems | MFWD Engagement Diagnostics, Differential Lock Faults, Axle Speed Sensor Tests | |
| Steering and Brakes | Steering Pressure Tests, Brake Diagnostics, Steering Controller Dtc Isolation | |
| Hydraulic System | Hydraulic Pump Flow Tests, Control Valve Diagnostics, Remote Hydraulic Faults, Hitch Diagnostics, System Pressure Checks | |
| Operator's Station | CommandCenter Diagnostics, ClimaTrak HVAC Dtc Isolation, Instrument Cluster Tests, Field Monitoring Faults | |
| Electronics | CAN Bus Diagnostics, ECU Replacement Procedures, Software Calibrations, Controller Area Network Fault Trees |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All models with ClimaTrak HVAC | ||
| Refrigerant Pressure Sending Unit (B130) - Compressor Operating Range | 1.38 (+/- 0.35) to 27.6 (+/- 1.38) bar | |
| ATC017 fault isolation | ||
| Refrigerant Pressure (B130) - A/C Relay Off Threshold (low pressure) | below 1.38 bar | |
| Refrigerant Pressure (B130) - A/C Relay Off Threshold (high pressure) | above 27.6 bar | |
| ATC013/ATC014 fault isolation | ||
| Ambient Air Temperature Sending Unit (B125/B126) - Sensor Range | -40 to 65 degrees C | |
| ATC042/ATC043 fault isolation | ||
| Ambient Air Temperature Sending Unit (B125/B126) - Signal Voltage Range | 0.0 to 5.0 volts | |
| ATC020 fault isolation | ||
| Evaporator Core Temperature Sending Unit (B129) - A/C Relay Enable Threshold | above 3 degrees C | |
| ATC018 fault isolation | ||
| Defog Sensor (B143) - Windshield Frequency Range | 32.3 to 37 Hz | |
| ATC044 fault isolation | ||
| Refrigerant Pressure Sending Unit (B130) - Signal Voltage Range | 0.0 to 5.0 volts | |
John Deere 6120, 6220, 6320, 6420, 6120L, 6220L, 6320L, 6420L, 6520L Common Problems This Manual Covers
HVAC compressor clutch cycles erratically, causing cabin temperature instability on 6120L-6520L tractors
Check the refrigerant pressure sending unit (B130) with the service tool and verify the displayed pressure stays within the 1.38 to 27.6 bar operating range during compressor operation. If the unit reads outside that window or the A/C relay cycles on high-pressure faults above 27.6 bar, replace B130. If the code regenerates after a new B130, test the evaporator core temperature sensor (B129) voltage and replace the ClimaTrak controller only after both sensors pass.
Manual Section: Operator's Station - ClimaTrak DiagnosticsAutoPowr transmission DTC returns immediately after deletion and ignition restart on 6420 or 6520L
A code that regenerates within the first drive cycle after deletion almost always points to either a failed speed sensor feeding the IVT controller or a calibration that was never completed after a controller swap. Run the IVT calibration sequence in the AutoPowr/IVT section before replacing the controller, because skipping calibration after a part change is the most common reason a fresh controller triggers the same fault.
Manual Section: System Diagnostics - AutoPowr/IVT TransmissionEngine power loss with no active DTC on 6220 or 6320.
Enter Section 212 - Observable Symptoms and follow the power-loss fault tree, which begins with fuel supply pressure and air intake restriction before moving to injection timing. A clogged fuel water separator or a collapsed air filter pre-cleaner hose accounts for the majority of these complaints. Test fuel transfer pressure and intake restriction with a manometer before suspecting the injection pump or turbocharger.
Manual Section: System Diagnostics - EngineRemote hydraulic response is slow or remote cylinder drifts under load on 6320-6420.
Measure hydraulic pump flow with a flow meter at the rated engine speed listed in the General Information section before touching the control valves. Low flow that passes the pump test points to internal bypass in the remote valve cartridge. The Hydraulic System diagnostic section covers the cartridge leak-down test and the pressure-compensator setting check so you can confirm which component to replace rather than swapping the entire valve stack.
Manual Section: System Diagnostics - Hydraulic SystemFrequently Asked Questions
What transmission types does this diagnostic manual cover for the John Deere 6120-6420 series?
The manual covers all five transmission families offered on these tractors: SyncroPlus, Power Reverser, PowrQuad, PowrQuad Plus and AutoQuad, and AutoPowr/IVT. Each has its own DTC section, symptom fault tree and pressure test procedures so you can isolate a shift complaint or code without guessing which transmission is fitted.
How do I look up a John Deere 6420 fault code using TM4733?
Start in Section 211 - Diagnostic Trouble Codes, find the controller prefix (engine, ATC, IVT, EPC and so on) and locate your code number. Each entry gives the fault condition, possible causes ranked by likelihood, and a reference to the system diagnostic procedure. If you have a symptom but no active code, use Section 212 - Observable Symptoms to enter the fault tree from what the tractor is doing.
Does this manual cover the AutoPowr IVT transmission on the 6420 and 6520L?
Yes. The AutoPowr/IVT section includes DTC fault trees specific to the infinitely variable transmission, control valve test procedures, speed sensor checks and the calibration steps required after a controller replacement. That calibration sequence is the step most often skipped after a part swap, which causes the new code to return within the first hour of operation.
Why does my John Deere 6120L HVAC compressor clutch cycle on and off erratically?
That is ATC DTC territory. The most common causes on these tractors are a failing refrigerant pressure sending unit (B130) reading outside its 1.38 to 27.6 bar operating window, a faulty evaporator core temperature sensor (B129) with a stuck-low reading, or a ClimaTrak controller that needs replacement after the same code regenerates across three key cycles. Section 213 walks you through the sensor voltage checks before condemning the controller.
Can this manual help reset the service indicator or oil change light on a 6220 or 6320?
Yes. The Operator's Station and General Information sections cover the CommandCenter menu structure and the reset procedure for the service interval indicator. The manual also documents which DTCs self-clear after the fault is corrected and which require an active deletion step with a service tool, so you know what to expect after a repair.
What format is this John Deere 6120, 6220, 6320, 6420, 6120L, 6220L, 6320L?
Instant PDF download (6 MB). You get the full 2199-page searchable Diagnostic immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Can I print specific sections of this John Deere 6120, 6220, 6320, 6420?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
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