Kohashi KS220 Excavator Overview and Troubleshooting

[MikePhua]

The Kohashi KS220 excavator is a robust and reliable piece of construction equipment, often found in both heavy-duty industrial work and general earthmoving projects. While Kohashi is not as widely known in some markets as brands like Caterpillar or Komatsu, it still provides a viable option for businesses looking for durable machinery at competitive prices. Like many excavators, the KS220 excels at digging, lifting, and moving heavy materials with precision. However, just like any piece of complex machinery, the Kohashi KS220 can face issues, some of which are more common than others. In this article, we'll take a deeper dive into the Kohashi KS220's features, potential issues, and solutions.
Kohashi Excavators: Company Background and Equipment History
Kohashi Machinery, a company specializing in manufacturing construction machinery, has been a significant player in the excavation and earthmoving equipment market. Known for producing durable, efficient machines, Kohashi excavators are primarily used for applications involving digging, trenching, lifting, and grading. The KS220 is part of Kohashi's range of mid-sized excavators, which are popular in both the commercial and residential construction sectors.
Despite not being a top-tier brand like Caterpillar, Komatsu, or Volvo, Kohashi has a loyal following in markets where cost-effective equipment is essential. The KS220 was designed with both efficiency and versatility in mind, featuring a compact yet powerful frame suitable for a variety of construction tasks.
Kohashi KS220 Excavator Specifications
The Kohashi KS220 excavator is engineered for tough jobs, offering a balance between power and maneuverability. Some notable features include:

• Operating Weight: Typically around 22,000 to 24,000 pounds (10,000 to 11,000 kg), making it ideal for medium-scale projects.
  
• Engine Power: The excavator is powered by a reliable diesel engine that produces approximately 120 horsepower, providing the necessary torque for demanding tasks.
  
• Hydraulic System: It comes equipped with a sophisticated hydraulic system, which ensures high lifting capacity and smooth operation when performing tasks such as digging, lifting, or material handling.
  
• Boom and Arm Reach: Designed for versatility, the Kohashi KS220’s boom and arm have a significant reach, which allows operators to handle a range of tasks, including deep digging and lifting heavy objects.
  
• Cab Features: The KS220 has a comfortable, user-friendly cabin equipped with essential controls for smooth operation, including air conditioning and ergonomic seats.
  

This combination of power, size, and maneuverability makes the Kohashi KS220 a solid choice for construction companies that need a versatile excavator for urban, industrial, or even light agricultural projects.
Common Issues with the Kohashi KS220 Excavator
While the Kohashi KS220 is a durable machine, like all excavators, it is subject to wear and tear. Below are some of the most common issues reported by operators and service technicians when working with the KS220:
1. Hydraulic System Failures
The hydraulic system is the lifeblood of any excavator, as it drives the arm, boom, and bucket. Common hydraulic issues on the KS220 may include:

• Hydraulic leaks: Over time, hoses and seals can deteriorate, leading to fluid leaks, which reduce hydraulic power and efficiency.
  
• Slow response times: If the hydraulic system is not performing optimally, the boom, arm, or bucket may respond slowly to commands, affecting productivity.
  
• Oil contamination: Dirty or contaminated hydraulic fluid can cause valves and pumps to malfunction, leading to a loss of power or system failure.
  

Solution: Regular maintenance and inspection of hydraulic components can help prevent leaks. Keep an eye on the hydraulic oil levels and replace the fluid at recommended intervals. Additionally, ensure that seals and hoses are checked periodically for wear.
2. Engine and Fuel System Problems
Like any diesel-powered machine, the Kohashi KS220’s engine and fuel system are integral to its performance. The following are common issues that may arise:

• Poor fuel efficiency: If the engine is consuming more fuel than usual, it could be an indication of issues with the fuel injectors, fuel filters, or combustion system.
  
• Starting issues: Starting problems can arise due to a faulty fuel pump, clogged fuel filter, or issues with the battery.
  
• Overheating: Overheating can occur due to a malfunctioning radiator, coolant leaks, or issues with the engine’s thermostat.
  

Solution: Regularly clean and replace the fuel filters, check the fuel system for leaks, and ensure the engine is running at optimal temperatures by inspecting the radiator and coolant levels. If starting problems persist, checking the battery, wiring, and fuel pump would be advisable.
3. Electrical System Malfunctions
The Kohashi KS220 relies on a complex electrical system to control key functions, including the starting system, lighting, and the hydraulic controls. Common issues may include:

• Faulty sensors or wiring: Over time, electrical components can wear out or become damaged, leading to inaccurate sensor readings or complete electrical failure.
  
• Dead battery: If the battery is not properly maintained or replaced at regular intervals, it can lead to starting issues.
  
• Electrical shorts: In some cases, electrical wiring can wear out or become exposed, creating a short circuit that affects the entire system.
  

Solution: Regular inspections of the electrical components, including wiring and sensors, are essential. Ensure that connections are clean and free of corrosion. Periodically check the battery’s charge and voltage, and replace it when necessary.
4. Undercarriage and Track Wear
As with any crawler excavator, the undercarriage and tracks on the Kohashi KS220 are subject to significant wear and tear, especially when working in rough or rocky conditions. Issues with the tracks may include:

• Excessive wear: Tracks can become worn down over time, reducing the excavator's mobility and efficiency.
  
• Track misalignment: If the tracks are not properly aligned, they can wear unevenly, leading to further damage to the undercarriage.
  
• Track stretching or breaking: In extreme conditions, the tracks can stretch or even break, leading to costly repairs.
  

Solution: Regularly inspect the tracks and undercarriage for signs of wear. If the tracks show signs of stretching or misalignment, they should be replaced or adjusted. Keep the undercarriage clean to avoid the accumulation of dirt and debris, which can accelerate wear.
Preventive Maintenance Tips
To extend the life of the Kohashi KS220 excavator and prevent common issues, it’s essential to follow a strict maintenance schedule. Below are some general maintenance tips:

• Regularly inspect hydraulic systems for leaks, fluid levels, and pump condition.
  
• Keep the engine and fuel system clean, checking for clogged fuel filters and replacing air filters as needed.
  
• Monitor the electrical system for faulty wiring or sensor issues.
  
• Ensure the undercarriage is properly maintained, including cleaning tracks and ensuring proper alignment.
  

Conclusion
The Kohashi KS220 excavator is a dependable machine for various construction and earthmoving applications. By addressing common issues such as hydraulic system failures, engine problems, electrical malfunctions, and undercarriage wear, operators can ensure the continued performance and reliability of this equipment. Regular maintenance is key to preventing major breakdowns and prolonging the life of the excavator. By taking the necessary precautions and keeping up with routine checks, you can ensure that the Kohashi KS220 remains a valuable asset in your fleet for years to come.