The John Deere F935 is a popular front mower known for its reliability and versatility. However, like any piece of machinery, it can experience issues over time. This comprehensive guide will explore common problems faced by F935 owners, provide troubleshooting tips, and offer solutions to keep your mower running smoothly.
Engine Issues
Starting Problems
One of the most frustrating issues F935 owners encounter is difficulty starting the engine. This can be caused by various factors:
- Fuel System Issues: Check for clogged fuel filters, stale fuel, or air in the fuel lines. Replace the fuel filter regularly and use fresh diesel fuel.
- Battery Problems: A weak or dead battery can prevent the engine from turning over. Test the battery and replace it if necessary.
- Glow Plug Failure: In cold weather, faulty glow plugs can make starting difficult. Inspect and replace worn glow plugs.
Overheating
Overheating can cause significant damage to your F935’s engine if not addressed promptly. Common causes include:
- Low Coolant Levels: Regularly check and top up coolant levels.
- Faulty Thermostat: A stuck thermostat can prevent proper coolant circulation. Replace if necessary.
- Clogged Radiator: Clean the radiator fins and ensure proper airflow.
Engine Stalling
If your F935 engine stalls during operation, consider these potential causes:
- Fuel System Issues: Check for clogged fuel filters or contaminated fuel.
- Air Intake Problems: Inspect the air filter and replace if dirty or clogged.
- Sensor Malfunctions: Faulty sensors can cause the engine to stall. Have a professional diagnose and replace any defective sensors.
Transmission Problems
Hydraulic System Failures
The F935’s hydraulic system is crucial for proper operation. Common issues include:
- Low Hydraulic Fluid: Regularly check and top up hydraulic fluid levels.
- Leaks: Inspect hoses, fittings, and seals for leaks and replace as needed.
- Contaminated Fluid: Change hydraulic fluid and filters according to the maintenance schedule.
Transmission Slipping
If you notice a loss of power or slipping during operation, consider these potential causes:
- Low Transmission Fluid: Check and top up fluid levels as needed.
- Worn Clutch Plates: Over time, clutch plates can wear out. Have a professional inspect and replace if necessary.
- Faulty Solenoids: Electrical issues with transmission solenoids can cause slipping. Diagnose and replace faulty components.
Mower Deck Problems
Uneven Cutting
An uneven cut can be frustrating and unsightly. Address this issue by:
- Leveling the Deck: Adjust the deck height and ensure it’s level from side to side and front to back.
- Sharpening Blades: Dull blades can result in an uneven cut. Sharpen or replace blades regularly.
- Tire Pressure: Ensure all tires are properly inflated for even weight distribution.
PTO Engagement Issues
Problems with the Power Take-Off (PTO) can prevent the mower deck from engaging. Troubleshoot by:
- Checking the PTO Switch: Ensure the switch is functioning correctly and replace if faulty.
- Inspecting PTO Clutch: A worn or damaged clutch may need replacement.
- Verifying Electrical Connections: Check for loose or corroded connections in the PTO circuit.
Electrical System Problems
Battery Drain
If your F935’s battery consistently dies between uses, consider these potential causes:
- Parasitic Draw: Have a professional check for electrical components drawing power when the mower is off.
- Faulty Alternator: A failing alternator may not charge the battery properly during operation.
- Corroded Connections: Clean and tighten all battery connections to ensure proper charging.
Instrument Panel Malfunctions
Issues with the instrument panel can make it difficult to monitor your F935’s performance:
- Faulty Gauges: Replace any non-functioning gauges.
- Wiring Problems: Inspect and repair any damaged wiring behind the instrument panel.
- Sensor Issues: Malfunctioning sensors can cause inaccurate readings. Diagnose and replace faulty sensors.
Maintenance Tips
To prevent many common problems and extend the life of your John Deere F935, follow these maintenance tips:
- Regular Oil Changes: Change engine oil and filter according to the manufacturer’s recommendations.
- Air Filter Maintenance: Clean or replace the air filter regularly to ensure proper engine performance.
- Fuel System Care: Use clean, fresh fuel and replace fuel filters as scheduled.
- Cooling System Upkeep: Flush the cooling system periodically and maintain proper coolant levels.
- Lubrication: Grease all fittings regularly to prevent wear on moving parts.
- Tire Maintenance: Check tire pressure and condition regularly for optimal performance and safety.
- Blade Care: Sharpen or replace mower blades as needed for a clean, even cut.
- Belt Inspection: Check all belts for wear and proper tension, replacing as necessary.
Performance Upgrades
While the John Deere F935 is a capable machine out of the box, there are several upgrades you can consider to enhance its performance:
- High-Flow Hydraulic Kit: Improve hydraulic performance for attachments that require more power.
- Comfort Seat: Upgrade to a suspension seat for a smoother ride during long mowing sessions.
- LED Lighting: Install LED work lights for better visibility during early morning or late evening operation.
- Mulching Kit: Add a mulching kit to improve grass clipping distribution and lawn health.
- Traction Aids: Consider adding wheel weights or tire chains for improved traction in challenging conditions.
Troubleshooting Table
| Problem | Possible Causes | Solutions |
|---|---|---|
| Engine won’t start | Dead battery, fuel issues, faulty starter | Check battery, fuel system, replace starter if necessary |
| Uneven cut | Dull blades, unleveled deck, tire pressure issues | Sharpen blades, level deck, adjust tire pressure |
| Hydraulic system failure | Low fluid, leaks, contamination | Check fluid levels, inspect for leaks, change hydraulic fluid and filters |
| PTO won’t engage | Faulty switch, worn clutch, electrical issues | Check PTO switch, inspect clutch, verify electrical connections |
| Overheating | Low coolant, faulty thermostat, clogged radiator | Check coolant levels, replace thermostat, clean radiator |
By understanding these common problems and following proper maintenance procedures, you can keep your John Deere F935 running smoothly for years to come. Regular care and attention to your mower will not only prevent costly repairs but also ensure optimal performance throughout its lifespan.
FAQs
What is the most common cause of starting problems in the John Deere F935?
The most common causes are fuel system issues, battery problems, and faulty glow plugs in cold weather.
How often should I change the oil in my F935?
Change the oil every 100 hours of operation or annually, whichever comes first.
What can cause uneven cutting with the F935 mower deck?
Uneven cutting is often caused by dull blades, an unleveled deck, or improper tire pressure.
How can I improve the hydraulic performance of my F935?
Regular maintenance and the installation of a high-flow hydraulic kit can improve hydraulic performance.
What should I do if my F935’s PTO won’t engage?
Check the PTO switch, inspect the clutch for wear, and verify all electrical connections in the PTO circuit.