John Deere 670A: A Comprehensive Guide and Troubleshooting Tips

[MikePhua]

The John Deere 670A is a well-regarded compact tractor that’s been used across a variety of applications, from agriculture to landscaping and construction. With its durability and reliable performance, it has earned a spot in many fleets. However, like any piece of equipment, it can face issues over time. In this article, we’ll delve into common questions and troubleshooting tips for the John Deere 670A, providing you with a comprehensive guide to maintaining and repairing this powerful machine.
Overview of the John Deere 670A
The John Deere 670A is a part of Deere’s 600 series compact utility tractors. It is equipped with a 3-cylinder diesel engine, offering a solid balance of power and efficiency for smaller to medium-sized jobs. While it’s a great fit for general utility work, users have sometimes reported common issues that could affect its longevity and operation. Understanding the machine's components and common pitfalls will help in troubleshooting and maximizing its performance.
Common Issues and Troubleshooting
Here are some common issues faced by John Deere 670A owners and how to address them:
1. Starting Problems
Starting problems are one of the most commonly reported issues in older John Deere 670A models. These issues often stem from a variety of sources.
Possible Causes:

• Battery Issues: Over time, batteries lose their ability to hold a charge. If the tractor is slow to start or doesn’t start at all, the first thing to check is the battery.
  
• Fuel System Blockages: Clogged fuel filters or air in the fuel system can prevent the engine from starting properly.
  
• Starter Motor Malfunction: If the starter motor is worn out, it might fail to engage the engine correctly.
  

Troubleshooting Tips:

• Check the battery voltage and ensure the connections are clean and tight.
  
• Replace any fuel filters that are clogged or overdue for replacement.
  
• Bleed the fuel system to remove any air pockets.
  
• Inspect the starter motor and solenoid for any signs of wear or damage.
  

2. Hydraulic System Failures
Another issue reported with the John Deere 670A is hydraulic system failure. If the hydraulic system is slow to respond or doesn’t operate at full capacity, it can greatly impact the functionality of attachments like loaders or backhoes.
Possible Causes:

• Low Hydraulic Fluid: One of the most common reasons for slow hydraulic systems is insufficient fluid levels.
  
• Damaged Hydraulic Hoses: Leaking or damaged hoses can cause a loss of pressure, reducing the effectiveness of the hydraulic system.
  
• Faulty Hydraulic Pump: The pump itself could be worn out or malfunctioning.
  

Troubleshooting Tips:

• Check hydraulic fluid levels and top up if necessary. Always use the recommended hydraulic fluid.
  
• Inspect hoses for any visible cracks or leaks and replace damaged sections.
  
• Test the hydraulic pump pressure with a gauge to determine if it’s producing the correct PSI.
  

3. Transmission Problems
Transmission problems, especially when the tractor is not shifting smoothly, can be frustrating. If the John Deere 670A has trouble shifting gears or exhibits jerky movements when changing speeds, it’s important to investigate the transmission thoroughly.
Possible Causes:

• Low Transmission Fluid: Like hydraulic systems, transmission systems rely on fluid for proper operation.
  
• Clutch Issues: A worn or improperly adjusted clutch could cause shifting problems.
  
• Gear Linkage Problems: The gear linkage or shifter mechanism might be worn or out of alignment.
  

Troubleshooting Tips:

• Check the transmission fluid level and make sure it is clean and at the proper level.
  
• Inspect the clutch for wear and ensure it’s properly adjusted.
  
• Check the gear linkage for any misalignment or signs of wear and replace worn components.
  

4. Engine Overheating
An overheating engine can cause severe damage to a John Deere 670A. If the temperature gauge consistently rises into the danger zone, it’s crucial to address the issue promptly.
Possible Causes:

• Low Coolant: Insufficient coolant in the engine is the leading cause of overheating.
  
• Clogged Radiator: Over time, the radiator can get clogged with dirt and debris, preventing adequate heat dissipation.
  
• Faulty Thermostat: A malfunctioning thermostat can prevent coolant from circulating properly.
  

Troubleshooting Tips:

• Check the coolant level and top up as needed.
  
• Inspect the radiator for any blockages or debris that could impede airflow.
  
• Test the thermostat by checking if it opens and closes properly at the required temperatures.
  

5. Steering Issues
If the John Deere 670A experiences difficulty with steering, whether it’s hard to turn or the steering feels loose, this could be indicative of a serious issue with the steering components.
Possible Causes:

• Low Power Steering Fluid: Power steering systems rely on fluid to reduce the effort needed to steer. If the fluid level is low, steering can become stiff or difficult.
  
• Worn Steering Components: Steering components such as the rack, pinion, or steering shaft can wear out over time, leading to play in the steering wheel.
  
• Damaged Steering Pump: A malfunctioning steering pump can result in inconsistent power steering.
  

Troubleshooting Tips:

• Check the power steering fluid level and top it up with the recommended fluid.
  
• Inspect the steering components for wear or damage and replace worn parts.
  
• Test the steering pump by checking the fluid pressure to ensure it’s functioning correctly.
  

Routine Maintenance for the John Deere 670A
Routine maintenance is key to keeping the John Deere 670A running smoothly and preventing major issues from arising. Below is a general maintenance checklist to follow:

1. Engine Oil: Change the engine oil and filter regularly, at least once every 100 hours of use or annually, whichever comes first.
   
2. Hydraulic Fluid: Check hydraulic fluid levels frequently and replace the fluid and filter at recommended intervals.
   
3. Fuel System: Replace fuel filters every 250 hours or annually.
   
4. Air Filter: Inspect and replace the air filter regularly, especially in dusty environments.
   
5. Cooling System: Check coolant levels and flush the cooling system as recommended by the manufacturer.
   
6. Tires and Suspension: Inspect tire pressure and condition, and maintain proper tire pressure for optimal performance.
   

Other Considerations and Tips

• Keep It Clean: A clean tractor is a happy tractor. Regularly clean the engine bay, undercarriage, and attachments to prevent dirt and debris from building up and causing overheating or mechanical failure.
  
• Check for Leaks: Always inspect for oil, fuel, or hydraulic fluid leaks after use. Small leaks can lead to major issues if not addressed early.
  
• Listen to Your Tractor: If you hear unfamiliar noises, it’s always best to investigate immediately. Don’t wait for an issue to escalate.
  

Conclusion
The John Deere 670A is a durable and dependable tractor, but like all machines, it requires attention to ensure it operates at peak performance. Understanding the common issues such as starting problems, hydraulic failures, and transmission concerns—and knowing how to address them—can save time and money. Regular maintenance is crucial to keeping the tractor running smoothly for years to come.
By following the troubleshooting steps outlined above and staying on top of routine maintenance, you can extend the life of your John Deere 670A and avoid costly repairs down the line.