John Deere 35D: Troubleshooting Common Issues

[MikePhua]

The John Deere 35D mini excavator is a well-regarded machine in the compact equipment sector, often chosen for its versatility, reliability, and ease of use in construction, landscaping, and utility work. However, like all machines, it can experience mechanical issues over time. This article explores common problems faced by operators of the JD 35D and offers potential solutions and tips for troubleshooting.
Overview of the John Deere 35D Mini Excavator
The John Deere 35D is part of the 35D series, which is known for offering powerful performance in a small, compact package. With a maximum digging depth of over 10 feet and a strong operating weight of around 7,500 pounds, it balances maneuverability with substantial lifting and digging power. These mini excavators are used in a variety of applications, from residential landscaping to commercial construction.
Key specifications include:

• Operating Weight: Approximately 7,500 lbs (3,402 kg)
  
• Engine Power: Around 24.7 hp (18.4 kW)
  
• Digging Depth: 10.5 ft (3.2 m)
  
• Bucket Capacity: 0.18-0.19 cubic yards (0.14-0.15 m³)
  

Despite its robust design, the John Deere 35D is not immune to mechanical failures. Here are some of the common issues faced by users.
Common Problems with the John Deere 35D
While the 35D is generally a reliable machine, certain issues can arise as the machine ages or when it is subjected to harsh working conditions. The following are some of the most common problems that owners and operators may encounter.
1. Hydraulic System Failures
Problem: One of the most frequently reported issues with the John Deere 35D is hydraulic failure. This could manifest as a loss of power to the boom, arm, or bucket, or the machine may struggle to lift or dig properly. Operators may also notice slow response times or jerky movements during operation.
Potential Causes:

• Low hydraulic fluid levels
  
• Clogged filters or contaminated fluid
  
• Air in the hydraulic system
  
• Faulty hydraulic pumps or valves
  

Solution:

• Check Fluid Levels: Ensure that hydraulic fluid is at the proper level. Low fluid can cause sluggish operation or no response from the hydraulic components.
  
• Replace Filters: Regularly replace hydraulic filters as they can become clogged with dirt and debris, reducing efficiency and increasing wear on the system.
  
• Bleed the System: If air has entered the hydraulic system, it may need to be bled out to restore full functionality.
  
• Inspect Components: Check the hydraulic pumps, cylinders, and valves for wear or damage. If any parts are damaged or leaking, they should be replaced immediately.
  

2. Engine Starting Problems
Problem: Some owners report that their John Deere 35D mini excavator has trouble starting, especially in cold weather. This may include sluggish cranking or no start at all.
Potential Causes:

• Faulty starter motor
  
• Weak or dead battery
  
• Fuel system issues
  
• Electrical connection problems
  

Solution:

• Inspect the Battery: A weak or dead battery is a common cause of starting problems. Check the battery charge, and if necessary, replace it.
  
• Examine the Starter: If the battery is good, check the starter motor for faults. A faulty starter may need to be replaced.
  
• Fuel System Check: Ensure that there is no air in the fuel lines and that the fuel is reaching the engine properly. A clogged fuel filter or malfunctioning fuel pump could be preventing the engine from starting.
  
• Electrical System: Inspect all electrical connections, especially the ground connections. Loose or corroded wires can disrupt the flow of power and prevent the engine from starting.
  

3. Engine Overheating
Problem: Another issue faced by some John Deere 35D operators is engine overheating, which can result in poor performance and potentially severe engine damage if not addressed.
Potential Causes:

• Low coolant levels
  
• Clogged radiator or cooling fins
  
• Faulty thermostat
  
• Broken or slipping fan belt
  

Solution:

• Check Coolant Levels: Low coolant can lead to engine overheating. Ensure that the coolant is at the appropriate level and top it off if necessary.
  
• Inspect the Radiator: A clogged radiator or cooling fins can restrict airflow, causing the engine to overheat. Clean the radiator and remove any dirt or debris blocking the airflow.
  
• Test the Thermostat: A malfunctioning thermostat can cause the engine to overheat by not allowing the coolant to circulate properly. If it’s faulty, it should be replaced.
  
• Inspect the Fan Belt: If the fan belt is slipping or broken, it will not cool the engine effectively. Make sure the belt is in good condition and properly tensioned.
  

4. Track Issues
Problem: Tracks on the John Deere 35D may become loose or damaged over time, especially when the machine is used extensively. Loose tracks can cause uneven wear, and in some cases, the tracks may even come off entirely.
Potential Causes:

• Track tension issues
  
• Worn sprockets or rollers
  
• Dirt and debris buildup in the undercarriage
  

Solution:

• Check Track Tension: Tracks that are too loose can slip off or wear out prematurely. Conversely, tracks that are too tight can cause unnecessary wear on the rollers and sprockets. Adjust the track tension according to the manufacturer's specifications.
  
• Inspect Sprockets and Rollers: Inspect the sprockets and rollers for wear. Worn components can cause the tracks to wear unevenly, affecting performance and stability.
  
• Clean the Undercarriage: Dirt and debris can accumulate in the undercarriage, leading to track issues. Regularly clean the undercarriage to prevent this buildup and ensure smooth operation.
  

5. Electrical System Malfunctions
Problem: The electrical system on the John Deere 35D can sometimes experience issues, especially with the lighting, instrument cluster, or other electrical components not functioning correctly.
Potential Causes:

• Faulty wiring or connections
  
• Blown fuses
  
• Malfunctioning alternator
  
• Dead battery
  

Solution:

• Inspect Fuses: Check the fuses related to the malfunctioning electrical components and replace any blown fuses.
  
• Examine Wiring and Connections: Inspect the wiring and connectors for corrosion, fraying, or loose connections. Tighten or replace any faulty connections.
  
• Test the Alternator: If the battery is not charging correctly, the alternator may be faulty. Use a multimeter to check the output of the alternator, and replace it if necessary.
  

Preventive Maintenance Tips
Regular maintenance is essential to keeping the John Deere 35D in top working condition. Here are a few preventive tips to avoid common issues:

• Change Filters Regularly: Whether it's hydraulic, fuel, or engine oil filters, regular replacement can prevent clogs and system failures.
  
• Check Fluids Frequently: Regularly monitor oil, coolant, and hydraulic fluid levels. Keeping the fluids at proper levels is key to ensuring the engine and hydraulics operate smoothly.
  
• Keep the Undercarriage Clean: A clean undercarriage reduces wear on the tracks and improves overall machine performance.
  
• Lubricate Moving Parts: Proper lubrication of joints, cylinders, and other moving parts reduces friction and prevents excessive wear.
  

Conclusion
The John Deere 35D is a reliable and versatile mini excavator designed for tough jobs, but like all machines, it requires regular maintenance and troubleshooting to keep it running smoothly. The common issues highlighted above can often be resolved with careful inspection and preventive measures. By addressing issues such as hydraulic failures, starting problems, and track issues, operators can extend the life of their equipment and ensure maximum productivity.
Regular servicing, adherence to maintenance schedules, and early detection of issues are key to ensuring that the John Deere 35D continues to perform at its best.