John Deere S680 Problems

The John Deere S680 combine, a workhorse in many fields, is known for its impressive harvesting capacity and advanced technology. However, like any complex piece of machinery, it's not immune to issues. Understanding the common problems and how to address them can significantly reduce downtime and keep your harvest running smoothly. Let's dive into some of the challenges S680 owners and operators face, and explore potential solutions.

What Are the Biggest Headaches with the S680?

While the S680 is generally reliable, certain issues tend to surface more frequently than others. These can range from electrical glitches to mechanical wear and tear. Knowing what to expect can help you prepare and potentially prevent problems before they escalate.

Electrical Gremlins: Modern combines are heavily reliant on electronics, and the S680 is no exception. Sensor failures, wiring issues, and software glitches can disrupt various functions, from auto-steering to yield monitoring.
Feeding and Threshing Challenges: Getting the crop smoothly into the combine and efficiently separating the grain can be problematic, especially in varying field conditions.
Drive System Woes: The hydrostatic drive system, responsible for powering the combine's movement, can experience issues like leaks, pump failures, or motor problems.
Residue Management Concerns: Properly managing crop residue after harvesting is crucial for soil health and future planting. The S680's residue management system, while generally effective, can sometimes struggle with heavy residue loads.

Decoding Those Pesky Electrical Issues

Electrical problems can be frustrating because they often manifest in unpredictable ways. Here's a closer look at some common electrical issues in the S680 and how to approach them:

Sensor Failures: The S680 is equipped with numerous sensors that monitor everything from engine temperature to grain tank levels. Faulty sensors can send incorrect information to the combine's computer, leading to performance issues or error codes. Regularly inspecting sensors for damage and keeping them clean is crucial. Use a diagnostic tool to pinpoint the specific sensor causing the problem.
Wiring Harness Problems: The combine's wiring harness is exposed to harsh conditions, including vibration, moisture, and extreme temperatures. Over time, wires can become frayed, corroded, or disconnected. Carefully inspect the wiring harness for any signs of damage. Pay close attention to areas where the harness is routed near moving parts or exposed to the elements. Use dielectric grease on connections to prevent corrosion.
Software Glitches: Like any computer system, the S680's software can sometimes experience glitches. These can manifest as erratic behavior, error codes, or even complete system shutdowns. Ensure that the combine's software is up to date. John Deere regularly releases software updates to address bugs and improve performance. Consider consulting a John Deere technician for complex software issues.
Fuse and Relay Issues: A blown fuse or a faulty relay can disable important systems. Check the fuse box for any blown fuses and replace them with the correct amperage. Relays can also fail over time. Consider replacing relays that are known to be problematic.
Grounding Problems: Poor grounding can cause a variety of electrical issues. Ensure that all grounding connections are clean and secure. Check the grounding straps between the engine, frame, and cab.

Taming Feeding and Threshing Troubles

Efficient feeding and threshing are essential for maximizing harvest efficiency. Here's how to address some common challenges in this area:

Uneven Feeding: Uneven feeding can result in inconsistent threshing and grain loss. Ensure that the feeder house chains and slats are in good condition and properly adjusted. Check the feeder house slip clutch and adjust it as needed. Consider using a header height control system to maintain a consistent feeding rate.
Rotor Loss: Excessive grain loss from the rotor indicates that the crop is not being threshed effectively. Adjust the rotor speed and concave clearance based on the crop type and moisture content. Check the condition of the rotor bars and concaves. Worn or damaged components can reduce threshing efficiency.
Shoe Loss: Grain loss from the cleaning shoe indicates that the material is not being separated effectively. Adjust the fan speed and sieve settings based on the crop type and moisture content. Check the condition of the sieves and chaffer. Clogged or damaged sieves can reduce cleaning efficiency.
Material Buildup: Buildup of crop material in the feeding or threshing areas can cause blockages and reduce performance. Ensure that the combine is properly maintained and lubricated. Regularly clean out any accumulated material. Consider using a crop flow monitoring system to detect blockages early.

Conquering the Drive System Demons

The hydrostatic drive system is critical for powering the combine's movement. Here's how to address some common issues:

Hydraulic Leaks: Hydraulic leaks can reduce the system's efficiency and lead to costly repairs. Regularly inspect the hydraulic hoses, fittings, and components for any signs of leaks. Replace any damaged hoses or fittings. Tighten any loose connections.
Pump Failures: The hydraulic pump is responsible for providing the pressure needed to operate the drive system. Pump failures can result in reduced speed or complete loss of drive. Monitor the hydraulic system pressure. Have the pump inspected by a qualified technician if you suspect a problem.
Motor Problems: The hydraulic motors convert hydraulic pressure into mechanical motion, driving the combine's wheels. Motor problems can result in reduced torque or complete failure. Listen for any unusual noises coming from the motors. Have the motors inspected by a qualified technician if you suspect a problem.
Hydrostatic Fluid Issues: Maintaining the correct hydrostatic fluid level and condition is crucial for the system's performance and longevity. Check the fluid level regularly and top it off as needed. Change the fluid and filter according to the manufacturer's recommendations. Use the correct type of fluid.

Mastering Residue Management

Proper residue management is essential for soil health and future planting. Here's how to address some common challenges with the S680's residue management system:

Uneven Residue Spreading: Uneven residue spreading can result in inconsistent soil warming and seed emergence. Adjust the spreader settings based on the crop type and residue load. Check the condition of the spreader paddles and deflectors. Worn or damaged components can affect spreading performance.
Residue Clumping: Clumping of residue can create problems for tillage and planting equipment. Adjust the chopper settings to reduce the size of the residue particles. Consider using a residue management attachment to break up and distribute the residue more evenly.
Hairpinning: Hairpinning occurs when residue is pushed into the soil instead of being cut. Ensure that the tillage equipment is properly adjusted and maintained. Consider using a coulter or residue manager to cut through the residue ahead of the tillage tool.
Overloading the Chopper: Attempting to chop too much residue at once can overload the chopper and reduce its performance. Adjust the combine's ground speed and header height to reduce the residue load. Consider using a windrower to pre-condition the residue before chopping.

Preventive Maintenance: Your Best Defense

The best way to avoid S680 problems is to implement a comprehensive preventive maintenance program. This includes:

Regular Inspections: Conduct regular visual inspections of the combine, paying close attention to areas that are prone to problems.
Lubrication: Follow the manufacturer's lubrication schedule to ensure that all moving parts are properly lubricated.
Filter Changes: Change the air, fuel, and hydraulic filters according to the manufacturer's recommendations.
Fluid Level Checks: Check the fluid levels regularly and top them off as needed.
Software Updates: Keep the combine's software up to date.
Professional Servicing: Schedule regular servicing with a qualified John Deere technician.

By following these preventive maintenance steps, you can significantly reduce the risk of S680 problems and keep your harvest running smoothly.

Frequently Asked Questions

Why is my S680 losing power? Low fuel pressure, a clogged fuel filter, or problems with the engine's electronic control unit (ECU) can cause power loss. Check these components and consult a technician.
What does "rotor loss" mean? Rotor loss refers to grain that is being thrown out the back of the combine with the crop residue, indicating inefficient threshing. Adjust rotor speed and concave clearance.
How often should I change the hydraulic fluid? Refer to your John Deere S680 operator's manual for the recommended hydraulic fluid change interval. Typically, it's every 1000 hours or annually.
Why is my header not feeding properly? Issues like worn feeder house chains, incorrect header height settings, or excessive crop moisture can cause feeding problems. Inspect the feeder house and adjust header settings.
What's the best way to clean the S680? Use compressed air to blow away loose debris, and wash the combine with soap and water. Avoid using high-pressure washers near electrical components.

The Bottom Line

The John Deere S680 is a capable machine, but understanding its potential weaknesses and practicing diligent maintenance are key to maximizing its lifespan and minimizing downtime. By addressing common issues proactively and adhering to a solid maintenance schedule, you can ensure a successful and efficient harvest season.