John Deere 120C

[MikePhua]

The John Deere 120C is a popular mid-sized excavator known for its durability, reliability, and powerful performance. As part of John Deere's line of construction equipment, the 120C is designed to handle a variety of tasks, from digging and lifting to grading and demolition. This article takes a deep dive into the features, specifications, maintenance requirements, and troubleshooting tips for the John Deere 120C.
Introduction to John Deere 120C
The John Deere 120C excavator is part of the company’s C-Series, which was designed to meet the increasing demands of the construction and mining industries for efficiency, power, and precision. This machine is favored for its balance of power and size, making it versatile enough for both large and small jobsites.

• Engine: The 120C is powered by a 4.5L, turbocharged diesel engine that delivers around 85 horsepower, providing ample power for most construction tasks. The engine’s efficiency ensures low fuel consumption while maintaining high output.
  
• Hydraulics: A standout feature of the 120C is its hydraulic system. It offers powerful hydraulic flow and pressure, making it ideal for a range of attachments such as buckets, hammers, and augers.
  
• Weight and Size: The 120C has an operating weight of approximately 12,000 kg (26,455 lbs), making it a compact yet powerful choice for tasks requiring a balance of size and strength.
  
• Cab and Operator Comfort: John Deere’s focus on operator comfort is evident in the 120C’s spacious, ergonomically designed cab. With an easy-to-use control panel, adjustable seating, and air conditioning, the 120C ensures that operators can work efficiently without discomfort, even on long shifts.
  

Key Features of the John Deere 120C
The John Deere 120C is equipped with several features that set it apart in the competitive world of excavators:

1. Advanced Hydraulics
   • The 120C comes with an advanced hydraulic system that allows for smooth and powerful operation, improving the machine’s ability to handle heavy digging, lifting, and grading tasks. It also allows for easy attachment changes, enhancing the excavator’s versatility.
     
2. Durable Undercarriage
   • The machine’s undercarriage is built to withstand the rigors of tough construction sites. With long-lasting components, such as the tracks and rollers, the 120C offers excellent stability and durability in rough conditions.
     
3. Easy Maintenance Access
   • One of the standout features of the 120C is its easy access for maintenance. The design of the machine allows operators and service technicians to quickly access the engine, hydraulic system, and other critical components for maintenance, which minimizes downtime and reduces overall maintenance costs.
     
4. Fuel Efficiency
   • John Deere has incorporated fuel-efficient technology into the 120C, ensuring that the excavator uses fuel efficiently without compromising on power. This feature makes the 120C an economical choice for long-term operation, especially in industries with tight profit margins.
     
5. Operator Safety and Comfort
   • The 120C's cab is designed for operator safety and comfort. Features include enhanced visibility, low vibration, and noise-reducing materials. The cab is also equipped with high-quality air conditioning and an adjustable seat for comfort during long hours of operation.
     

John Deere 120C Specifications
Here is a breakdown of the key specifications of the John Deere 120C:

• Engine Type: 4.5L, turbocharged diesel
  
• Gross Power: 85 horsepower
  
• Operating Weight: 12,000 kg (26,455 lbs)
  
• Bucket Capacity: 0.25 m³ to 0.35 m³ (depending on the bucket configuration)
  
• Digging Depth: Up to 5.8 meters (18.9 feet)
  
• Maximum Reach: 8.9 meters (29.2 feet)
  
• Hydraulic Flow Rate: 180 liters per minute (47.5 gallons per minute)
  
• Fuel Tank Capacity: 220 liters (58.2 gallons)
  
• Travel Speed: 5.3 km/h (3.3 mph) (high-speed mode)
  

These specifications make the 120C a powerful yet compact machine, capable of handling a wide range of tasks efficiently and reliably.
Maintenance Tips for the John Deere 120C
Regular maintenance is crucial to keeping the John Deere 120C excavator in top working condition. Here are some essential maintenance tips:

1. Engine Oil and Filters
   • Regularly check and replace the engine oil and filters. John Deere recommends changing the engine oil every 250-500 hours, depending on the operating conditions. Make sure to use the correct grade of oil as specified in the owner’s manual.
     
2. Hydraulic System Maintenance
   • The hydraulic system of the 120C is vital for its performance. Regularly check the hydraulic fluid levels and ensure that the hydraulic filters are replaced at intervals recommended by the manufacturer. Contaminants in the fluid can cause wear and tear on the system, leading to decreased performance.
     
3. Track Maintenance
   • Given the 120C’s weight and the demands placed on its tracks, regular inspection and maintenance of the undercarriage are crucial. Make sure to check the track tension and replace any worn-out or damaged components to prevent downtime due to track issues.
     
4. Cleaning and Inspection
   • Keep the excavator clean, especially the cooling systems and the engine compartment. A clean engine and hydraulic system will reduce the risk of overheating and premature wear. Periodically inspect for leaks, cracks, or other signs of damage.
     
5. Battery Care
   • Inspect the battery regularly for corrosion and ensure that the connections are clean and tight. Replace the battery when necessary to avoid starting problems.
     

Common Issues with the John Deere 120C and Troubleshooting
While the John Deere 120C is a reliable machine, like all equipment, it can experience occasional issues. Here are some common problems and their solutions:

1. Engine Won’t Start
   • Cause: Battery failure, fuel system issue, or ignition problem.
     
   • Solution: Check the battery voltage and connections. Inspect the fuel lines and filters for blockages. Verify the ignition system is functioning correctly.
     
2. Hydraulic System Failure
   • Cause: Low hydraulic fluid, air in the hydraulic system, or worn-out components.
     
   • Solution: Check the fluid levels and top up if needed. Bleed the hydraulic system to remove any trapped air. Replace any worn-out hydraulic components as required.
     
3. Uneven Tracks
   • Cause: Track tension is incorrect or the rollers are worn out.
     
   • Solution: Adjust the track tension as per the manufacturer’s guidelines. Inspect the rollers and replace any damaged ones.
     
4. Overheating
   • Cause: Clogged radiators, low coolant levels, or a failing fan.
     
   • Solution: Clean the radiator and check the coolant levels. Inspect the cooling fan and replace it if necessary.
     
5. Unresponsive Controls
   • Cause: Hydraulic fluid contamination or a malfunctioning control valve.
     
   • Solution: Check for hydraulic fluid contamination and replace the fluid if necessary. Inspect the control valves and replace them if damaged.
     

Conclusion
The John Deere 120C excavator is a robust and reliable machine that excels in a variety of construction and excavation tasks. With its powerful hydraulic system, efficient engine, and operator-friendly features, it remains a popular choice for contractors and operators alike. Regular maintenance, attention to common issues, and proper troubleshooting can extend the life of the 120C and ensure that it continues to perform reliably. By following the best practices outlined in this guide, operators can maximize the performance and longevity of their John Deere 120C excavators.