The John Deere 850 is known for its durability and performance. Equipped with a 3-cylinder diesel engine, it delivers consistent power and reliability for various tasks. Despite its strengths, certain problems can arise, necessitating timely maintenance and repairs.
This post will go into the common problems faced by John Deere 850 owners and offer practical solutions to keep your tractor running efficiently. Let’s jump in.
John Deere 850 Problems
1. Engine Starting Issues
One of the most frequent issues with the John Deere 850 is difficulty starting the engine. This problem can stem from various causes:
Battery Problems
A weak or dead battery is a common cause of starting issues. Ensure the battery is fully charged and the terminals are clean and secure. Replacing an old or faulty battery can often resolve this problem.
Fuel System Troubles
Clogged fuel filters or air in the fuel lines can prevent the engine from starting. Regularly check and replace fuel filters, and bleed the fuel lines to remove any trapped air.
Glow Plug Malfunctions
In colder climates, glow plugs are essential for starting diesel engines. If the glow plugs are faulty, the engine may struggle to start. Test the glow plugs and replace them if necessary.
2. Transmission Problems
Transmission issues can significantly impact the performance of the John Deere 850. Common transmission problems include the following:
Gear Slippage
If the tractor slips out of gear or has difficulty staying in gear, it can indicate worn or damaged gear. Inspect the transmission and replace any worn components to prevent further damage.
Hydraulic System Failures
The hydraulic system is crucial for the operation of various attachments. Low hydraulic fluid levels or leaks can cause the system to malfunction. Regularly check the hydraulic fluid and repair any leaks promptly.
3. Electrical System Issues
The electrical system in the John Deere 850 can also encounter problems. Common electrical issues include:
Wiring Problems
Damaged or corroded wiring can cause electrical malfunctions. Inspect the wiring harness for any signs of damage and replace any faulty wires.
Alternator Failures
A malfunctioning alternator can lead to battery charging issues. Test the alternator and replace it if it’s not functioning correctly.
4. Overheating
Overheating is another common problem that can affect the John Deere 850. Potential causes of overheating include:
Coolant Leaks
Coolant leaks can lead to low coolant levels, causing the engine to overheat. Inspect the cooling system for leaks and repair them to maintain proper coolant levels.
Radiator Blockages
A blocked radiator can impede airflow and cause the engine to overheat. Clean the radiator regularly to ensure optimal performance.
Thermostat Failures
A faulty thermostat can prevent the engine from reaching its optimal operating temperature. Replace the thermostat if it’s not functioning correctly.
5. Steering and Handling Issues
Problems with steering and handling can affect the tractor’s maneuverability. Common issues include:
Loose Steering
Worn steering components can cause loose steering. Inspect the steering system and replace any worn parts to restore proper handling.
Alignment Problems
Misaligned wheels can cause the tractor to pull to one side. Check the wheel alignment and adjust it as needed.
6. PTO (Power Take-Off) Problems
The PTO is essential for operating various attachments. Common PTO problems include:
PTO Not Engaging
If the PTO fails to engage, it could be due to a faulty switch or linkage. Inspect these components and replace any faulty parts.
PTO Slipping
Slipping PTO can indicate worn clutch plates. Inspect the PTO clutch and replace any worn components.
7. Fuel Efficiency Issues
Reduced fuel efficiency can be a sign of underlying problems. Common causes of poor fuel efficiency include the following:
Dirty Air Filters
Dirty air filters can restrict airflow and reduce fuel efficiency. Regularly clean or replace air filters to ensure optimal performance.
Fuel Injector Problems
Faulty fuel injectors can cause inefficient fuel combustion. Test and replace any faulty injectors to improve fuel efficiency.
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8. Brake System Problems
A reliable brake system is crucial for safe operation. Common brake system problems include:
Spongy Brakes
Spongy brakes can be caused by air in the brake lines. Bleed the brake system to remove any trapped air and restore proper braking performance.
Brake Pad Wear
Worn brake pads can reduce braking efficiency. Regularly inspect and replace brake pads to ensure reliable braking.
Regular Maintenance Tips
To prevent these common problems and ensure the longevity of your John Deere 850, follow these maintenance tips:
Regular Inspections
Conduct regular inspections of all major systems, including the engine, transmission, hydraulic, and electrical systems. Address any issues promptly to prevent further damage.
Scheduled Servicing
Follow the manufacturer’s recommended service schedule. Regular servicing can help identify and resolve potential problems before they become serious.
Proper Storage
Store your tractor in a clean, dry place to protect it from the elements. Proper storage can prevent rust and other damage.
Additional Resources to Help Diagnose and Fix:
- John Deere Dealer: Your local John Deere dealer is the best resource for parts, service, and troubleshooting advice. They will have access to specific manuals and information for your machine’s model year.
- Online Forums: Several online forums cater to John Deere equipment owners. Sites like “New Ag Talk” have threads specifically about the 850 dozer. You can search for solutions to problems others have encountered and get advice from experienced operators.
- YouTube Videos: You’ll find a wealth of information on YouTube, including videos on troubleshooting common John Deere 850 problems and repairs.
FAQs
How can I improve the fuel efficiency of my John Deere 850?
Improving fuel efficiency involves maintaining clean air filters, ensuring fuel injectors are in good condition, and regularly servicing the engine. Also, avoid overloading the tractor, which can lead to higher fuel consumption.
What should I do if my John Deere 850’s engine overheats?
If your engine overheats, check the coolant levels and inspect the cooling system for leaks. Ensure the radiator is clean and the thermostat is functioning correctly. If the problem persists, consult a professional technician.
Why is my John Deere 850 having trouble starting?
A weak battery can cause starting issues, clogged fuel filters, or faulty glow plugs. Check these components and replace any that are not functioning correctly.
How often should I service my John Deere 850?
Follow the manufacturer’s recommended service intervals. Typically, this includes regular oil changes, filter replacements, and inspections of all major systems.
What causes the transmission to slip on my John Deere 850?
Transmission slippage can be due to worn gears or low hydraulic fluid levels. Inspect the transmission and hydraulic system, and replace any worn components or top up the hydraulic fluid as needed.
How can I fix loose steering on my John Deere 850?
Loose steering is often caused by worn steering components. Inspect the steering system and replace any parts that show signs of wear to restore proper handling.
Final Words
The John Deere 850 is a reliable and durable tractor, Always address problems promptly and consult professional technicians when necessary to keep your John Deere 850 in top condition.
