John Deere 6675 Skid Steer Electrical System Troubleshooting and Repair

[MikePhua]

Introduction
The John Deere 6675 skid steer loader is a powerful and versatile piece of equipment widely used in construction, landscaping, and material handling. Known for its reliability and high lifting capacity, the 6675 is equipped with an advanced electrical system that controls everything from engine functions to hydraulic operations. However, like any heavy machinery, issues can arise, particularly in the electrical system. A malfunctioning electrical system can lead to various problems, including engine failure, hydraulic issues, or loss of functionality in the machine’s attachments.
This article explores the common electrical issues faced by John Deere 6675 skid steer owners, provides an overview of how to troubleshoot and repair these problems, and outlines how to maintain the electrical system to ensure long-term reliability.
Overview of the John Deere 6675 Skid Steer
The John Deere 6675 is a part of the 6000 series skid steers and was built to provide power, efficiency, and ease of use. Here are some key specifications:

• Engine: Powered by a 67 hp (50 kW) engine, this skid steer is capable of lifting heavy loads and performing a variety of tasks.
  
• Lifting Capacity: With an operating capacity of 2,250 lbs (1,020 kg), it can handle most heavy-duty lifting tasks.
  
• Hydraulics: The 6675 features a high-flow hydraulic system, making it suitable for demanding jobs with various attachments like augers, buckets, and hydraulic hammers.
  
• Electrical System: The electrical system in the John Deere 6675 plays a critical role in engine management, hydraulic control, and auxiliary attachments. It is designed to work efficiently with the loader’s complex hydraulic and mechanical systems.
  

While the electrical system in the 6675 is built to be durable, it’s still vulnerable to wear and tear. Understanding the common issues that arise and having the right troubleshooting steps can save time and prevent costly repairs.
Common Electrical Problems in the John Deere 6675 Skid Steer

1. Battery and Charging System Issues
   A common issue with many skid steers, including the John Deere 6675, is problems related to the battery or charging system. This can lead to difficulty starting the engine, or worse, complete engine failure. Causes may include:
   • Corroded battery terminals: Dirt, dust, or corrosion can interfere with the connection between the battery and the electrical system.
     
   • Faulty alternator: The alternator may fail to charge the battery, causing a drained battery and resulting in electrical system malfunctions.
     
   • Loose or damaged wiring: A loose connection can cause intermittent power loss, preventing the engine from starting or causing erratic behavior in the machine’s electrical components.
     
   Troubleshooting Tips:
   • Clean the battery terminals to remove any corrosion and ensure a strong connection.
     
   • Use a multimeter to test the alternator’s output voltage. It should typically read between 13.8 to 14.4 volts when the engine is running.
     
   • Inspect wiring connections for wear and tear, and ensure they are properly secured.
     
2. Faulty Fuses or Relays
   Fuses and relays protect the electrical circuits in your skid steer. If either a fuse or relay blows or fails, it can lead to equipment shutdowns or loss of functionality in specific systems.
   • Signs of failure: Non-functioning lights, malfunctioning hydraulic controls, or erratic engine behavior can all point to a blown fuse or relay.
     
   • Troubleshooting Tips:
     • Refer to the John Deere service manual for the specific location of the fuses and relays.
       
     • Check the fuses with a continuity tester and replace any that are blown.
       
     • Test the relays by swapping them with known good ones to verify functionality.
       
3. Electrical Wiring Issues
   Over time, the wiring in any piece of heavy equipment can become worn or damaged, especially in high-use areas like around the engine and hydraulic systems. This can lead to power loss, malfunctions, or even fires in extreme cases.
   • Signs of wiring issues: Flickering lights, sudden power loss, or electrical components working intermittently.
     
   • Troubleshooting Tips:
     • Inspect wiring for visible signs of wear, fraying, or exposed wires.
       
     • Ensure wires are properly routed and not rubbing against sharp edges or high-temperature areas.
       
     • Replace damaged wiring with the correct gauge and insulation to ensure safety and functionality.
       
4. Sensor and Switch Problems
   The John Deere 6675 features numerous sensors and switches that help control everything from engine speed to hydraulic pressure. If any of these sensors or switches fail, it can lead to engine stalls, hydraulic issues, or improper machine operation.
   • Signs of sensor or switch failure: Warning lights, abnormal engine performance, or malfunctioning attachments.
     
   • Troubleshooting Tips:
     • Use diagnostic equipment to scan for error codes that might point to faulty sensors.
       
     • Check each switch and sensor individually by testing their electrical continuity.
       
     • Replace faulty sensors or switches with original equipment manufacturer (OEM) parts.
       

Repairing Electrical Issues in the John Deere 6675

1. Electrical System Diagnostics
   Diagnosing electrical problems in the John Deere 6675 can be challenging without the proper tools. It’s essential to have access to the right diagnostic equipment, such as a multimeter, scan tools, and wiring diagrams. These tools allow technicians to measure voltage, current, and continuity, making it easier to identify the root cause of the problem.
   • Common Diagnostic Tools:
     • Multimeter: Used to test for electrical continuity, measure voltage, and check current flow.
       
     • Diagnostic Scan Tools: These tools interface with the machine’s onboard computer to retrieve error codes and pinpoint sensor or system malfunctions.
       
     • Wiring Diagrams: These provide a map of the machine’s electrical system, helping technicians trace problems and identify the correct wiring for specific components.
       
2. Manuals and Service Documentation
   Having access to the John Deere service manual and electrical schematics is vital when dealing with complex electrical problems. While a shop service manual typically provides comprehensive troubleshooting steps, wiring diagrams, and component specifications, it’s not always easy to obtain one.
   • Where to Find Manuals:
     • Authorized John Deere Dealers: Dealers often provide service manuals and technical support for specific equipment models.
       
     • Online Resources: Many online databases, like those run by John Deere or third-party suppliers, provide digital versions of service manuals.
       
     • Forums and Communities: Other equipment owners and mechanics may offer tips, resources, or even share manuals on forums dedicated to heavy machinery.
       

Preventive Maintenance for Electrical Systems

1. Routine Inspections
   Regularly inspect the electrical system of the 6675 skid steer to catch potential issues early. Look for signs of wear on wires, connectors, and fuses. Routine checks can prevent costly downtime and repairs.
   
2. Cleaning and Protecting Components
   Keep electrical components clean and free from dirt, debris, and corrosion. Use protective sprays or coatings on connectors and wiring to prevent water ingress and corrosion. Ensure that all terminals are clean and tightly secured.
   
3. Scheduled Battery and Alternator Maintenance
   Regularly check the battery’s voltage and the alternator’s charging capabilities. Keeping the electrical power supply in top condition is key to ensuring reliable machine operation.
   

Conclusion
The electrical system in the John Deere 6675 skid steer is integral to its performance, but it’s not immune to problems. By regularly maintaining the electrical components and addressing issues promptly, operators can prevent significant downtime and extend the life of their equipment. With the right tools, manuals, and diagnostic skills, most electrical problems can be identified and repaired with relative ease, ensuring that the skid steer continues to perform reliably on the job.