Komatsu

KOMATSU PC128US-2, PC138US-2, PC138USLC-2E0 Hydraulic Excavator

Posted on by Service Manuals

KOMATSU PC128US-2, PC138US-2, PC138USLC-2E0 Hydraulic Excavators: Comprehensive Specifications, Maintenance Insights, and Repair Tips

The KOMATSU PC128US-2, PC138US-2, and PC138USLC-2E0 hydraulic excavators are recognized for their versatility, compact design, and reliability in various construction and excavation projects. These models are ideal for urban construction sites and other operations requiring efficient movement in confined spaces. This article will delve into the key specifications of these machines, discuss common maintenance challenges, and provide essential repair tips. We’ll also highlight the importance of using an official service manual to ensure proper maintenance and repairs are performed correctly, with access to reliable, detailed information.

Key Specifications: Engineered for Compact Performance

Each of these KOMATSU hydraulic excavators shares common strengths such as their ability to operate in restricted spaces without sacrificing power. Below are the specifications that define their performance capabilities:

1. KOMATSU PC128US-2

  • Engine Power: 69.3 kW (93 HP) @ 2,050 RPM.
  • Operating Weight: 12,420 – 13,040 kg.
  • Bucket Capacity: 0.11 – 0.66 m³.
  • Tail Swing Radius: Compact ultra-short tail swing for confined spaces.

2. KOMATSU PC138US-2

  • Engine Power: 66.3 kW (89 HP) @ 2,050 RPM.
  • Operating Weight: 12,600 – 13,900 kg.
  • Bucket Capacity: 0.11 – 0.66 m³.
  • Digging Depth: 5,660 mm.

3. KOMATSU PC138USLC-2E0

  • Engine Power: 69.7 kW (93.4 HP) @ 2,100 RPM.
  • Operating Weight: 13,000 – 13,500 kg.
  • Bucket Capacity: 0.34 m³.
  • Tail Swing Radius: Optimized for narrow working environments.

Common Maintenance Issues: Addressing Routine Challenges

Regular maintenance of your KOMATSU PC128US-2, PC138US-2, and PC138USLC-2E0 hydraulic excavators is key to ensuring a long service life and reducing downtime. Here are the most frequently encountered maintenance challenges:

1. Hydraulic System Leaks and Wear

One of the most common issues involves the hydraulic system. With the extensive use of hydraulics in these excavators, hoses and seals can wear out over time, leading to fluid leaks and reduced performance. Regular inspections are necessary to identify signs of wear before they result in significant failures.

2. Track and Undercarriage Degradation

Working in rough terrains, the tracks and undercarriage are particularly susceptible to wear and damage. Track tension can loosen over time, affecting both performance and fuel efficiency. If not properly maintained, this can also lead to uneven wear on the undercarriage components.

3. Cooling System Efficiency

Overheating, especially in warmer climates or during prolonged use, can be a persistent issue. The excavators’ cooling systems can become clogged with dirt, debris, or dust, reducing their ability to regulate engine temperatures. It is crucial to clean the radiators regularly and check coolant levels.

4. Engine Performance Issues

Engines in hydraulic excavators, particularly those with higher operational hours, may experience loss of power due to clogged air filters or dirty fuel injectors. Regular maintenance of the air and fuel systems will ensure smooth operation.

5. Electrical System Failures

Modern excavators rely on a range of electrical components, such as sensors and circuit boards. Electrical failures can be tricky to diagnose and can cause significant downtime if not addressed promptly. Issues such as dead batteries, corroded wiring, and faulty connections are common, especially in older models.

Repair Tips: Prolonging the Life of Your KOMATSU Excavator

To maintain your KOMATSU excavators in peak condition and avoid costly downtime, here are some essential repair tips:

1. Hydraulic System Maintenance

Check hydraulic fluid levels frequently and inspect hoses for any cracks, bulges, or signs of wear. If you notice leaks, replace damaged parts immediately. Always use the recommended hydraulic fluids as outlined in the service manual for optimal system performance.

2. Track and Undercarriage Care

Inspect the undercarriage after each shift to ensure no debris is caught between the components. Check the track tension and adjust it according to the guidelines found in the service manual to prevent excessive wear. Replace worn-out components like track rollers, idlers, and sprockets to ensure the machine operates smoothly.

3. Cooling System Repairs

Regularly clean the radiator and other cooling system components to avoid overheating. Ensure that the coolant is always at the proper level and replace it as needed. If the engine continues to overheat, consider flushing the entire cooling system and replacing old hoses and seals to prevent leaks.

4. Engine and Air Filter Maintenance

Clean or replace air filters regularly to prevent dust and debris from entering the engine. This simple task can significantly extend the life of your engine. Keep the fuel system clean by changing fuel filters periodically and using high-quality fuel to avoid clogging injectors.

5. Electrical System Diagnostics

Carry out regular checks of the battery, fuses, and wiring for signs of wear or corrosion. If you encounter intermittent electrical issues, refer to the diagnostic procedures outlined in the KOMATSU PC128US-2, PC138US-2, PC138USLC-2E0 Hydraulic Excavator Service Manual to troubleshoot the problem efficiently.

Real-World Experiences: Testimonials from Operators

Operators who have used the KOMATSU PC128US-2, PC138US-2, and PC138USLC-2E0 models in real-world conditions often praise their efficiency, particularly in tight urban environments. Below are a few experiences shared by those who regularly operate these machines:

“We’ve had the PC128US-2 on our site for over three years, and it’s a reliable performer. We do a lot of roadwork and its short-tail swing makes it perfect for narrow areas. Keeping up with hydraulic maintenance has been the key to avoiding breakdowns.” – Construction Foreman, Ohio

“Our PC138USLC-2E0 has been working on several projects involving trenching, and we’ve been pleased with its fuel efficiency and power. We had some track wear, but with regular undercarriage inspections and a focus on cleaning, we’ve kept it in good shape.” – Equipment Operator, Texas

The Role of the Official Service Manual: Your Ultimate Maintenance Guide

An official service manual is an invaluable resource for anyone operating or maintaining a KOMATSU hydraulic excavator. These manuals provide comprehensive instructions that ensure all repairs and maintenance are performed correctly, reducing the risk of further damage or failure.

The KOMATSU PC128US-2, PC138US-2, PC138USLC-2E0 Hydraulic Excavator Service Manual offers:

  • Step-by-Step Procedures: Detailed guidance for tasks ranging from basic maintenance to complex repairs, ensuring technicians follow the correct steps.
  • High-Quality Diagrams: Clear and detailed diagrams help you visualize components and understand how they fit together, making it easier to troubleshoot issues.
  • Manufacturer-Specific Advice: The manual ensures that you follow factory-recommended practices for part replacements, fluid specifications, and maintenance intervals, ensuring long-term performance.
  • Troubleshooting Guides: Comprehensive troubleshooting instructions help pinpoint and resolve issues quickly, minimizing downtime.

Having the official service manual on hand means you can handle repairs confidently, ensuring the longevity of your machine while reducing costly repair shop visits.

Conclusion: Maximizing Efficiency and Durability

The KOMATSU PC128US-2, PC138US-2, and PC138USLC-2E0 hydraulic excavators are renowned for their ability to perform in confined spaces without sacrificing power or efficiency. Regular maintenance and timely repairs, especially in areas like the hydraulic system, undercarriage, and engine, are essential to keeping these machines running smoothly.

By using an official service manual, operators and technicians can ensure proper maintenance procedures are followed, leading to enhanced performance and reduced downtime. Taking a proactive approach to preventive care will not only extend the life of your excavator but also ensure it remains a valuable asset for years to come.

Service Manuals