The John Deere 3520, while reliable, can encounter issues like starting trouble, hydraulic malfunctions, transmission problems, overheating, electrical faults, PTO issues, and steering alignment concerns. Solutions include checking fluid levels, replacing filters, inspecting wiring, and ensuring regular maintenance. Addressing these common John Deere 3520 problems promptly helps keep your tractor running efficiently and extends its lifespan.
In this guide, we’ll cover some of the most frequent issues 3520 owners encounter and provide straightforward fixes.
1. Starting Issues
One of the most common complaints with the John Deere 3520 is starting issues, particularly after long periods of inactivity or in colder weather.
Common Causes
- Battery Problems: A weak or discharged battery is often the culprit, especially if the tractor has been unused for a while.
- Fuel System Issues: Old or contaminated fuel can clog the fuel system and prevent the engine from starting.
- Glow Plug Malfunction: In colder temperatures, faulty glow plugs may fail to provide the necessary heat for ignition.
Quick Fixes
- Check and Charge the Battery: If the battery voltage is low, charge it fully. For an older battery, consider replacing it to avoid future issues.
- Use Fresh Fuel: Drain any old fuel and refill the tank with fresh, high-quality diesel to prevent clogs.
- Inspect the Glow Plugs: If you’re experiencing starting problems in cold weather, check the glow plugs and replace them if needed.
By maintaining a charged battery and using fresh fuel, you can minimize starting problems and ensure your 3520 is ready when you are.
2. Hydraulic System Malfunctions
Hydraulics are essential for the 3520’s operation, especially if you use attachments like loaders or backhoes. Hydraulic issues can cause sluggish performance, overheating, or loss of power.
Common Causes
- Low Hydraulic Fluid Levels: Low fluid can cause the system to work inefficiently and overheat.
- Clogged Filters: Dirty hydraulic filters restrict flow, leading to poor performance and increased pressure.
- Worn Hoses or Seals: Leaks in hoses or seals can cause hydraulic fluid loss, impacting overall power.
Quick Fixes
- Check Fluid Levels Regularly: Monitor hydraulic fluid levels and top up as needed with John Deere-approved hydraulic oil.
- Replace Filters: Clean or replace hydraulic filters every 200 hours of use, or as recommended in the 3520 manual, to prevent clogs.
- Inspect Hoses and Seals: Regularly inspect hoses and seals for wear or leaks. Replace any damaged components promptly to maintain optimal hydraulic performance.
With regular hydraulic maintenance, you can keep your 3520’s attachments working smoothly and efficiently.
3. Transmission Issues
Some John Deere 3520 owners report transmission problems, such as jerky movement, lack of power, or overheating, especially after long hours of use.
Common Causes
- Low Transmission Fluid Levels: Insufficient fluid can lead to jerky operation and overheating.
- Dirty Transmission Filter: Clogged filters restrict fluid flow and cause performance issues.
- Faulty Transmission Belt: A worn or damaged belt can slip and cause transmission problems.
Quick Fixes
- Check Transmission Fluid Levels: Regularly check and top up transmission fluid levels as needed. Use the recommended type of transmission fluid for the John Deere 3520.
- Replace the Transmission Filter: Clean or replace the transmission filter every 200-400 hours of use, or as specified in the manual.
- Inspect the Belt: Examine the transmission belt for signs of wear or fraying and replace it if necessary to ensure smooth operation.
Keeping your transmission fluid levels and filters in check can prevent most transmission-related issues and keep your tractor running smoothly.
4. Overheating Issues
The John Deere 3520’s engine can sometimes overheat, especially during long periods of use or in hot weather. Overheating can lead to engine damage if not addressed.
Common Causes
- Blocked Radiator Fins: Dust and debris can clog radiator fins, reducing cooling efficiency.
- Low Coolant Levels: Insufficient coolant leads to overheating as the engine cannot dissipate heat effectively.
- Dirty Air Filter: A clogged air filter restricts airflow, making the engine work harder and heat up faster.
Quick Fixes
- Clean the Radiator Fins: Regularly inspect and clean radiator fins with compressed air to remove dust and debris.
- Check Coolant Levels: Monitor coolant levels and refill with the recommended type if it’s low. Replace coolant periodically to prevent build-up.
- Replace the Air Filter: Inspect the air filter regularly and replace it if it’s dirty or clogged to ensure proper airflow.
Preventative cooling system maintenance can help prevent overheating and extend the life of your John Deere 3520.
5. Electrical Problems
Some 3520 owners encounter electrical issues, such as flickering lights, unresponsive controls, or dashboard errors.
Common Causes
- Loose Wiring Connections: Vibrations from use can cause connections to loosen over time.
- Blown Fuses: Fuses may blow out, causing certain components or systems to fail.
- Corroded Terminals: Corrosion on battery terminals disrupts the electrical flow.
Quick Fixes
- Check and Tighten Connections: Inspect all wiring connections and ensure they are secure. Tighten any loose connections to prevent interruptions.
- Replace Blown Fuses: Check the fuse box if you notice electrical problems and replace any blown fuses.
- Clean Battery Terminals: Use a battery terminal cleaner or a mixture of baking soda and water to clean corrosion from terminals.
Regular checks on your electrical system can prevent major issues and keep all components functioning properly.
6. PTO (Power Take-Off) Problems
PTO issues can be frustrating, especially when attachments like mowers or tillers won’t engage or stop suddenly.
Common Causes
- Engagement Lever Issues: The PTO lever may become worn or misaligned.
- Clogged PTO Clutch: Debris in the clutch area can cause poor PTO performance.
- Electrical Connection Faults: For electric PTOs, faulty wiring or connections can prevent the PTO from engaging.
Quick Fixes
- Inspect and Adjust the Lever: Ensure the engagement lever is correctly aligned and functioning. Tighten or replace if needed.
- Clean the PTO Clutch: Remove any dirt and debris from around the clutch to ensure smooth operation.
- Check Electrical Connections: For electric PTOs, inspect and repair any loose or corroded connections.
Maintaining your PTO system ensures reliable operation of attachments and enhances your John Deere 3520’s versatility.
7. Steering and Alignment Issues
Steering problems, such as difficulty turning or alignment issues, can make operating your John Deere 3520 challenging.
Common Causes
- Low Power Steering Fluid: Low fluid can make steering difficult.
- Worn or Loose Steering Linkages: Over time, linkages may wear out or come loose.
- Misaligned Wheels: Rough terrain can cause wheel misalignment, impacting steering accuracy.
Quick Fixes
- Check and Top Up Steering Fluid: Regularly check power steering fluid levels and refill as needed with the recommended fluid.
- Tighten or Replace Linkages: Inspect steering linkages for wear or looseness and repair or replace as necessary.
- Align the Wheels: Adjust wheel alignment if you notice your tractor pulling to one side or difficulty steering.
Addressing steering issues promptly can improve maneuverability and make your 3520 safer to operate.
Final Maintenance Tips for John Deere 3520
Maintaining your John Deere 3520 is essential to prevent these common issues and ensure it performs reliably. Here are some general tips:
- Follow a Maintenance Schedule: Refer to the John Deere 3520 manual for recommended maintenance intervals, including fluid changes, filter replacements, and inspections.
- Use Quality Parts and Fluids: Use John Deere-approved parts and fluids for replacements to maintain the tractor’s performance and longevity.
- Store Properly: Keep your 3520 in a dry, covered area to prevent rust and protect it from the elements.
- Regular Inspections: Before each use, take a few minutes to inspect key components, check fluid levels, and ensure everything is in working order.
Wrapping Up
Owning a John Deere 3520 comes with numerous benefits, but like any machinery, it requires regular care. By understanding common John Deere 3520 problems, such as starting difficulties, hydraulic malfunctions, transmission issues, overheating, electrical faults, PTO malfunctions, and steering troubles, you can address these challenges head-on and keep your tractor running smoothly.
Regular maintenance, timely repairs, and a proactive approach to potential issues will extend the life of your John Deere 3520 and improve its performance. A well-maintained 3520 is not just a tractor; it’s a dependable partner in all your agricultural and landscaping tasks.
