Error Code 36 on Komatsu PC75UU-2 Excavator

[MikePhua]

Komatsu is one of the most respected names in the heavy equipment industry, with a reputation for manufacturing durable and high-performance machinery. The Komatsu PC75UU-2 is a popular compact hydraulic excavator, known for its excellent fuel efficiency, compact size, and versatility in a wide range of applications. However, like any piece of machinery, it can sometimes present issues, including error codes that may require attention. One such issue is Error Code 36, which can be perplexing for operators unfamiliar with its cause.
This article will explain what Error Code 36 means for the Komatsu PC75UU-2, possible causes, and solutions to help technicians and operators troubleshoot and resolve this error.
What is Error Code 36 on the Komatsu PC75UU-2?
Error codes are integral to modern heavy equipment. They are used to help technicians diagnose problems with specific systems of the machine. Error Code 36 typically relates to a hydraulic system malfunction or sensor failure within the machine. The PC75UU-2, like many Komatsu models, uses an integrated system of sensors and monitoring software to ensure that various components are functioning correctly. When a failure or abnormality is detected, the machine’s computer system will generate an error code to alert the operator.
The Role of the Hydraulic System in the PC75UU-2
The hydraulic system on an excavator like the Komatsu PC75UU-2 is crucial for its performance. It powers many of the key functions, such as the boom, arm, and bucket movements, as well as other systems like the swing mechanism and traveling. The hydraulic system works by pressurizing hydraulic fluid, which is then distributed to the various cylinders and valves.
A malfunction in the hydraulic system, such as a low hydraulic pressure, a failure in one of the hydraulic components, or a sensor issue, can trigger an error code like Error Code 36. Therefore, addressing the hydraulic system’s issues is the first step in troubleshooting.
Common Causes of Error Code 36
There are several potential reasons for Error Code 36 on the Komatsu PC75UU-2. Below are some of the most common causes:

1. Hydraulic Oil Pressure Issues:
   • Low hydraulic oil levels or contaminated hydraulic oil can lead to insufficient pressure in the hydraulic system, triggering an error. This may also indicate that there’s a leak or a failure in one of the hydraulic lines or pumps.
     
2. Faulty Sensors:
   • The PC75UU-2 is equipped with multiple sensors that monitor hydraulic pressure, flow rates, and other critical functions. If one of these sensors malfunctions or fails, it could send incorrect data to the control system, resulting in Error Code 36.
     
3. Clogged or Damaged Hydraulic Filters:
   • If the hydraulic filter is clogged with dirt or debris, the hydraulic system cannot circulate oil effectively. This can lead to a drop in pressure and trigger an error. Regular maintenance and timely replacement of filters are crucial to avoid this issue.
     
4. Damaged Hydraulic Pumps or Valves:
   • The hydraulic pumps or control valves may wear out over time due to extended use or poor maintenance. Damaged components can reduce hydraulic efficiency and cause the error code to appear.
     
5. Electrical or Wiring Issues:
   • Sometimes, electrical issues such as worn-out wiring or loose connections can interfere with sensor signals or other components in the hydraulic system, triggering Error Code 36.
     
6. Improper Fluid Temperature:
   • The temperature of the hydraulic fluid plays a vital role in the system’s performance. If the fluid temperature becomes too high or low, it can result in hydraulic failure. Overheating may occur due to overloading or inadequate cooling.
     

Troubleshooting Error Code 36 on the Komatsu PC75UU-2
To resolve Error Code 36, a systematic approach to troubleshooting is essential. Here are the steps to follow:

1. Check Hydraulic Oil Levels:
   • Inspect the hydraulic oil level and top it off if necessary. Ensure that the oil is clean and free of contamination. If the oil is dirty, replace it with fresh, high-quality hydraulic fluid recommended by Komatsu.
     
2. Examine the Hydraulic Filters:
   • Check the hydraulic filters for blockages or damage. If the filters are clogged, clean or replace them as required. This is a common issue that can easily be resolved during routine maintenance.
     
3. Inspect Sensors and Wiring:
   • Check the sensors responsible for hydraulic pressure and flow readings. Look for signs of wear or malfunction. Ensure all wiring connections are secure, and there are no frayed or damaged wires that could be interfering with sensor operation.
     
4. Test the Hydraulic Pump:
   • Test the hydraulic pump to ensure it is operating correctly. If the pump has lost pressure or shows signs of wear, it may need to be repaired or replaced.
     
5. Examine the Hydraulic Valves:
   • Inspect the hydraulic control valves for leaks or internal damage. If valves are found to be faulty, replace them to restore proper hydraulic function.
     
6. Check Fluid Temperature:
   • Verify that the hydraulic fluid temperature is within the recommended range. If it is too high, investigate potential causes like overheating due to excessive load or inadequate cooling. Fix the root cause to prevent further issues.
     
7. Run Diagnostics with a Service Tool:
   • Komatsu provides diagnostic tools that can interface with the machine’s control system. Use the diagnostic tool to check for more detailed error information or logs that can pinpoint the exact issue.
     

Preventive Measures for Avoiding Hydraulic System Issues
Prevention is always better than cure. Regular maintenance and periodic checks are crucial for avoiding hydraulic issues like Error Code 36. Here are some best practices to maintain your Komatsu PC75UU-2:

1. Change Hydraulic Oil and Filters Regularly:
   • Regularly check the hydraulic oil quality and change it as per the manufacturer’s recommended intervals. Replace the filters to ensure optimal hydraulic flow.
     
2. Inspect Hydraulic Components:
   • Regularly inspect the hydraulic pump, cylinders, valves, and hoses for any signs of wear, leaks, or damage. Address any issues early to avoid system failure.
     
3. Monitor Fluid Temperature:
   • Always keep an eye on the hydraulic fluid temperature. Ensure that the cooling system is functioning properly to prevent overheating.
     
4. Calibrate Sensors:
   • Ensure that all hydraulic sensors are calibrated and functioning correctly. Properly calibrated sensors help ensure accurate readings and prevent errors from occurring.
     

Conclusion
Error Code 36 on the Komatsu PC75UU-2 is often caused by issues with the hydraulic system, such as low oil levels, clogged filters, faulty sensors, or damaged hydraulic components. By performing thorough checks and addressing the common causes listed above, operators can resolve the issue and get their machine back to optimal performance. Regular maintenance is key to avoiding these issues and ensuring the longevity of the equipment.
For operators and technicians, understanding how to troubleshoot these codes and perform regular inspections is essential for maintaining the productivity and reliability of heavy equipment like the Komatsu PC75UU-2.