JOHN DEERE S540, S550, S660, S670, S680, S690 Combines Diagnostics and Tests Service Manual TM80391

John Deere S540, S550, S660, S670, S680, S690 Combines (Diagnostics & Tests) Service Manual

This **John Deere Combine Service Manual (TM803919)** provides **detailed diagnostics, troubleshooting, and test procedures** for John Deere **S540, S550, S660, S670, S680, and S690** combines. It includes **comprehensive schematics, fault codes, electrical testing procedures, and component specifications** to ensure optimal machine performance and efficiency.

File Format: PDF

Size: 100.17 MB

No. of pages: 5470

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

📑 Table of Contents Overview:

General Information & Safety

• Safety precautions and procedures
• Combine identification and general specifications
• Diagnostic and testing procedures

Diagnostic Trouble Codes (DTCs)

• Engine control unit (ECU) codes for T2, T3, and iT4 engines
• ATC, AYM, CAB, CRU, CSM, PTP, SSU, VTi system codes
• Hydraulic, electrical, and power distribution fault codes

Observable Symptoms & Troubleshooting

• Engine performance issues
• Hydraulic system failures
• Electrical and control unit malfunctions
• Cab climate control diagnostics

Electrical System & Control Units

• CAN Bus diagnostics
• Engine, fuel, and power distribution circuits
• Lighting and Ag Management Solutions (AMS)
• Wiring diagrams and schematics

Engine & Cooling System

• Air intake and cooling system components
• Fan speed control and radiator diagnostics
• Fuel injection system troubleshooting
• Compression tests and turbocharger diagnostics

Hydraulic System

• Pressure regulation and testing
• Header lift and feeder house hydraulics
• Steering and braking hydraulic circuits
• Residue system hydraulic operation

Transmission & Drives

• Main gearcase diagnostics
• Ground drive and traction control systems
• Transmission performance tests
• Adjustments and calibration procedures

Cab & Operator Station

• Climate control and air conditioning system
• Display monitor diagnostics
• Electrical connectors and control modules

Steering, Brakes, & Chassis

• Steering angle sensor adjustments
• Brake pressure and hydraulic function testing
• Chassis control unit troubleshooting

This **John Deere S-Series Combine Diagnostics and Tests Manual** is an essential resource for technicians and owners who need **detailed troubleshooting procedures, electrical schematics, and hydraulic diagnostics** for maintaining peak performance of their John Deere combines.