John Deere 850 Final Drive Issues and Solutions

[MikePhua]

The John Deere 850 is a widely used tractor in heavy equipment operations. While the machine is built to handle tough tasks, issues with the final drive can sometimes arise. The final drive is a crucial component that transfers power from the engine to the wheels or tracks, enabling movement. When there are problems with the final drive, it can result in loss of mobility or other significant performance issues.
Common Final Drive Problems on the John Deere 850
Several common problems are often reported by operators regarding the final drive on the John Deere 850. Some of these issues include:

1. Loss of Power to the Tracks/Wheels
   • One of the most noticeable signs of a malfunctioning final drive is a loss of power to the wheels or tracks. This may result in the tractor becoming stuck, even though the engine is running.
     
   • This issue can be caused by several factors such as worn gears, a damaged planetary gearbox, or insufficient lubrication.
     
2. Strange Noises from the Final Drive
   • Unusual grinding, whining, or clunking noises can indicate wear on the gears, bearings, or other internal components of the final drive.
     
   • If these noises are not addressed promptly, they can lead to further damage and potentially more costly repairs.
     
3. Leaking Oil
   • Leaks around the seals of the final drive are a common issue. When the oil leaks out, it can lead to insufficient lubrication and overheating of the final drive components.
     
   • It’s essential to replace any worn seals and keep the final drive oil at the proper level to avoid further damage.
     
4. Overheating
   • Overheating of the final drive can be caused by insufficient lubrication, worn-out components, or external factors such as excessive load.
     
   • Continuous overheating can cause severe damage to the internal gears and seals.
     

Diagnosis of Final Drive Problems
To accurately diagnose final drive issues on the John Deere 850, it’s important to go through a systematic troubleshooting process:

• Check for Leaks: Examine the final drive housing for any oil leaks. Pay close attention to the seals and gaskets.
  
• Inspect the Oil Level: Low oil levels can lead to overheating and excessive wear. Ensure that the final drive oil is at the appropriate level.
  
• Listen for Unusual Noises: While operating the machine, listen for any grinding or abnormal sounds coming from the final drive. These noises may be a result of worn or damaged gears.
  
• Test for Power Loss: Test the machine’s movement under load. If the machine is struggling to move or loses power, the final drive may be at fault.
  

Repair and Maintenance Solutions
Once the issue with the final drive has been identified, the following solutions are typically recommended:

1. Sealing and Oil Replacement:
   • Replacing worn seals and ensuring that the final drive is filled with the correct amount of oil can often solve problems related to leaks and overheating.
     
   • Use high-quality oil that meets John Deere’s specifications to ensure proper lubrication.
     
2. Gears and Bearings Replacement:
   • If the final drive is making strange noises or has suffered from a lack of lubrication, the internal gears and bearings may need to be replaced. This is a more involved repair and may require professional assistance.
     
   • It is recommended to use genuine John Deere replacement parts for the best performance.
     
3. Full Final Drive Overhaul:
   • In cases where there is significant damage to the planetary gears, shafts, or other internal components, a full overhaul or replacement of the final drive might be necessary.
     
   • This is often a costly repair and should be done by an experienced technician to avoid further complications.
     

Preventative Maintenance Tips
Preventing final drive issues on the John Deere 850 is possible with regular maintenance. Some key tips include:

• Regular Oil Checks and Changes: Ensure the final drive oil is changed regularly and is kept at the proper level.
  
• Inspect Seals and Bearings: Inspect the seals and bearings for any signs of wear or damage. Replace them as necessary.
  
• Avoid Overloading: Never exceed the recommended load capacity of the machine. Overloading can strain the final drive and lead to premature wear.
  

Conclusion
The final drive of a John Deere 850 is a critical component that enables the machine to operate smoothly. If you notice any issues such as power loss, unusual noises, or leaks, it’s important to address them immediately to avoid costly repairs. Regular maintenance, including checking oil levels and replacing worn seals and parts, can help extend the life of the final drive and keep your John Deere 850 running efficiently.