Hitachi EX120-2: Troubleshooting Intermittent Slow Hydraulics

[MikePhua]

This post discusses the intermittent slow hydraulic issues on a Hitachi EX120-2 excavator. The user shares their experience with the malfunctioning hydraulics, seeking advice and solutions from others in the community to resolve the problem.
Background and Issue Description
The user explains that their Hitachi EX120-2 excavator is experiencing slow hydraulics across all functions intermittently. This issue is affecting the machine’s performance, as the operator is unable to achieve full hydraulic efficiency. The user is looking for potential causes and troubleshooting tips to fix the problem.
Symptoms and Problematic Behavior
The key symptom reported is the inconsistent hydraulic response. The hydraulics work normally at times but then become sluggish, affecting all functions of the machine, including the boom, bucket, and arm. The user notes that the issue happens sporadically, making it difficult to identify a clear pattern or root cause.
Potential Causes of Slow Hydraulics
Several possible causes for the slow hydraulics are discussed in the post. The user is advised to check the hydraulic fluid levels, as low fluid can lead to poor hydraulic performance. Other potential causes include a clogged hydraulic filter, issues with the hydraulic pump, or a problem with the relief valve or pressure settings. The user is also advised to inspect the hydraulic hoses and connections for any leaks or blockages.
Troubleshooting and Solutions
The post offers practical troubleshooting steps. The user is encouraged to check the hydraulic fluid first, ensuring that it is at the correct level and that it is clean. Next, the hydraulic filter should be inspected and replaced if necessary. If these steps don’t resolve the issue, the user is advised to test the hydraulic pump and relief valve for any faults, as these components are critical for proper hydraulic operation.
Maintenance Tips for Preventing Future Problems
To prevent similar hydraulic issues in the future, the user is advised to perform regular maintenance on the hydraulic system. This includes checking fluid levels, replacing filters on a scheduled basis, and inspecting the system for any signs of wear or damage. Regular maintenance ensures that the machine continues to operate efficiently and reduces the likelihood of intermittent hydraulic failures.
Conclusion and Final Recommendations
In conclusion, the intermittent slow hydraulics on the Hitachi EX120-2 are likely caused by a few common issues, such as low fluid, clogged filters, or hydraulic pump malfunctions. The user is encouraged to follow the suggested troubleshooting steps to identify and fix the problem. Regular maintenance of the hydraulic system will help keep the machine in good working condition and prevent future issues.