John Deere W540 C670 Combine Diagnostic and Test Service Manual
TM401619
John Deere Service Manual
TM401519
Models:W540, W550, W650, W660, T550, T560, T660, T670, C670
The PDF TM401619 Diagnostic and Test Service Manual for John Deere W540, W550, W650, W660, T550, T560, T660, T670, and C670 is one of the most searched technical documents for farmers and technicians who need accurate troubleshooting, fault code diagnostics, and system testing procedures. Below are the key sections users search for when looking for this manual.
Engine Diagnostic Procedures – Fault Codes & Testing
✔ Troubleshooting engine performance issues
✔ Injector, turbocharger, and fuel pressure diagnostics
✔ Step-by-step test procedures for sensor failures
The manual includes deep engine diagnostics that guide technicians through error code identification, engine misfire detection, and performance testing to ensure reliable field operation.
Electrical System Testing – Wiring Diagrams & Electronic Modules
✔ Fuse and relay testing procedures
✔ CAN-Bus communication diagnostics
✔ Sensor and actuator electrical testing
This section is important for users searching for electrical fault locations, wiring schematics, and diagnostic procedures to resolve issues in the combine’s electronic control systems.
John Deere W550, W650, W660 Combine Diagnostic and Test Service Manual
Hydraulic System Diagnostic Tests – Pressure & Flow Checks
✔ Hydraulic pump and valve testing
✔ Header lift, steering, and reel drive diagnostics
✔ Flow and pressure measurement instructions
Searchers typically want hydraulic troubleshooting, making this section essential for resolving low pressure, slow operation, and hydraulic leaks in W-Series and T-Series combines.
Transmission and Drive System Troubleshooting
✔ Hydrostatic drive testing
✔ Gearbox and clutch performance diagnostics
✔ Drive line vibration and noise analysis
Users often look for transmission test procedures. This section provides calibration steps and drive system checks to maintain optimal field performance.
Separator, Threshing & Cleaning System Diagnostics
✔ Separator engagement troubleshooting
✔ Rotor and beater speed testing
✔ Cleaning shoe and sieve operational tests
This part helps users diagnose issues affecting harvest quality, including poor grain separation or abnormal vibration.
John Deere T550, T560, T660 Combine Diagnostic Service Manual
Technical Data, Specifications & Diagnostic Tools
✔ Calibration values and sensor ranges
✔ Required diagnostic tools
✔ System specifications for each model
Perfect for technicians searching for official specifications, sensor values, and test limits required for accurate diagnostics.