The John Deere 850 tractor, while known for its durability and reliability, is not without its flaws. Some of the worst John Deere 850 problems include hydraulic system failures, engine overheating, transmission issues, electrical malfunctions, steering difficulties, and PTO problems. These issues can arise due to wear and tear, inadequate maintenance, or aging components.
To avoid major breakdowns, regular maintenance like checking hydraulic fluid levels, cleaning radiators, inspecting transmission and electrical systems, and addressing steering or brake concerns is essential. By staying on top of these potential issues, you can keep your John Deere 850 running smoothly and extend its lifespan.
Whether you’re already a proud owner or considering investing in a John Deere 850, understanding these problems will help you maintain the tractor and ensure its optimal performance. Let’s dive into the most common concerns.
1. Hydraulic System Failure
One of the most frequently reported issues with the John Deere 850 is hydraulic system failure. The hydraulic system is essential for operating attachments such as loaders, backhoes, or mowers. Over time, you may notice that the hydraulic lift becomes slower or completely unresponsive.
Common causes of hydraulic failure include:
- Low hydraulic fluid levels: A leak in the system or general wear and tear can cause hydraulic fluid levels to drop. If left unchecked, this can lead to a complete failure.
- Dirty or clogged hydraulic filter: A clogged filter can reduce the efficiency of fluid flow, resulting in sluggish response.
- Faulty hydraulic pump: In rare cases, the pump may fail, requiring a replacement.
Prevention and Solutions:
Regular maintenance of the hydraulic system, such as checking for leaks, replacing filters, and keeping fluid at the proper levels, is key. If the pump is the issue, it’s often best to consult a professional to replace it.
2. Overheating Engine
Another common problem with the John Deere 850 is engine overheating, especially during prolonged periods of operation. Overheating can lead to severe damage to the engine, resulting in expensive repairs if not addressed in time.
Potential causes of engine overheating include:
- Clogged radiator: Dirt, grass, and debris can accumulate in the radiator, blocking airflow and causing the engine to overheat.
- Low coolant levels: A leak in the cooling system or a failure to maintain coolant levels can cause the engine to run hot.
- Faulty thermostat: If the thermostat isn’t functioning properly, it may fail to regulate the engine’s temperature.
Prevention and Solutions:
To avoid overheating, make sure to clean the radiator regularly and check for any signs of blockage. Maintaining proper coolant levels and replacing the thermostat when necessary are simple but effective ways to keep the engine cool.
3. Transmission Problems
Many John Deere 850 owners report issues with the transmission, particularly when shifting gears. A grinding noise, difficulty in shifting, or gears slipping can indicate transmission problems that need attention.
Common transmission issues include:
- Worn clutch: Over time, the clutch can wear down, leading to difficulty in engaging gears.
- Transmission fluid leaks: Leaks can result in low fluid levels, which in turn can cause the transmission to malfunction.
- Worn gears or bearings: Gears and bearings can wear out, especially in older models, causing shifting problems.
Prevention and Solutions:
Regularly checking and topping off transmission fluid levels is crucial. If you suspect the clutch is worn, it’s important to have it replaced before it leads to more extensive damage. Additionally, addressing leaks and inspecting gears during routine maintenance can help prevent major transmission issues.
4. Electrical System Malfunctions
Electrical problems are another common issue with the John Deere 850, particularly in older models. Electrical malfunctions can range from simple battery drainage to more complex issues with wiring and connections.
Typical electrical issues include:
- Dead battery: If the tractor’s battery is old or has been exposed to extreme temperatures, it may lose its ability to hold a charge.
- Faulty starter motor: If the starter motor fails, the engine may not turn over, preventing the tractor from starting.
- Loose or corroded connections: Corroded or loose electrical connections can cause intermittent power loss or complete failure of the electrical system.
Prevention and Solutions:
Regularly check the battery’s condition and replace it if necessary. Cleaning and securing electrical connections can help prevent issues related to corrosion. If you experience frequent starting issues, it may be necessary to replace the starter motor.
5. Steering Difficulties
Steering problems are another complaint among John Deere 850 owners, particularly with the power steering system. Difficulty in steering or a lack of response can make operating the tractor more challenging, especially when using heavy attachments.
Common steering issues include:
- Leaking power steering fluid: Leaks in the power steering system can cause a loss of hydraulic pressure, making the steering less responsive.
- Worn steering components: Over time, components such as the steering box, linkage, or tie rods can wear down, leading to loose or unresponsive steering.
- Air in the hydraulic lines: If air gets into the hydraulic system, it can cause the power steering to function improperly.
Prevention and Solutions:
Regularly check power steering fluid levels and inspect for leaks. Replacing worn steering components is essential for maintaining responsive steering. Bleeding the hydraulic lines can help remove air pockets and restore proper function.
6. PTO (Power Take-Off) Problems
The Power Take-Off (PTO) system on the John Deere 850 is essential for operating implements like mowers, tillers, and balers. However, some users have reported issues with the PTO not engaging or disengaging properly.
Common PTO problems include:
- Worn PTO clutch: The PTO clutch can wear down over time, leading to difficulty in engaging or disengaging the system.
- Damaged PTO shaft: A bent or damaged PTO shaft can prevent the system from operating smoothly.
- Electrical issues: In models with electronically engaged PTOs, wiring problems or a faulty switch can cause the PTO to malfunction.
Prevention and Solutions:
To avoid PTO issues, regularly inspect the clutch and shaft for signs of wear or damage. Ensuring that the electrical system is in good working order is also important for maintaining PTO function.
7. Fuel System Issues
Fuel system problems can severely impact the performance of your John Deere 850, leading to poor engine performance or complete failure to start.
Fuel system problems include:
- Clogged fuel filters: Dirt and debris in the fuel can clog filters, restricting the flow of fuel to the engine.
- Air in the fuel lines: If air enters the fuel lines, it can cause the engine to run poorly or fail to start.
- Faulty fuel injectors: In some cases, the fuel injectors may become clogged or malfunction, leading to poor fuel delivery.
Prevention and Solutions:
Regularly replacing the fuel filter and ensuring the fuel lines are free of air can help prevent fuel system issues. If the injectors are faulty, cleaning or replacing them will restore proper fuel delivery.
8. Brake Failure
Brake failure is a rare but serious issue that can occur with the John Deere 850, particularly in older models. If the brakes become unresponsive, it can pose a significant safety risk during operation.
Common brake issues include:
- Worn brake pads: Over time, the brake pads can wear down, reducing their effectiveness.
- Brake fluid leaks: Leaking brake fluid can result in reduced pressure, making the brakes less responsive.
- Faulty brake lines: Damaged or corroded brake lines can lead to brake failure.
Prevention and Solutions:
Regularly inspecting the brakes and replacing worn pads is essential for maintaining safety. Checking for brake fluid leaks and replacing faulty lines will ensure the brakes remain responsive during operation.
Final Thoughts on the Worst John Deere 850 Problems
The John Deere 850 is a solid and reliable tractor, but like any piece of machinery, it requires regular maintenance to keep it in top condition. By staying vigilant and addressing these common issues—such as hydraulic failures, overheating engines, transmission problems, and electrical malfunctions—you can prevent minor problems from turning into major repairs.
Whether you’re an experienced tractor owner or new to the world of farming equipment, understanding the worst John Deere 850 problems will help you keep your tractor running smoothly for years to come. Regular inspections, timely repairs, and proper maintenance can go a long way in ensuring your John Deere 850 continues to be a valuable tool on your farm or homestead.
