Introduction
HYDAC HDA 3840-A-350-124 hydraulic cylinder oil leakage is a common problem in industrial hydraulic systems. This causes a loss of efficiency, ongoing recovery costs and the risk of breaching safety standards. This article provides a systematic analysis of the root causes of leaks, including seal selection, ventilation, and installation errors.
Overview of the component
The hydraulic cylinder HYDAC HDA 3840-A-350-124 is used in hydraulic drive systems to control the movement of industrial mechanisms. It operates at a temperature of 0–60 °C, a pressure of 10–350 bar, with a volume of 3840 cm³. The oil can withstand up to 10,000 hours of wear without renewal if properly installed and maintained.
Leak rates
During the inspection, an oil leak was detected from the upper end of the cylinder. Measurements showed a leak of 15–20 ml/h. Vibration in the sealing zone reached 12–15 μs/mm, which is above the permissible limit of 8 μs/mm (DSTU 4465:2018). The temperature measurement in the sealing zone was 62 °C, which exceeds the limit value of 55 °C (EN 13794:2016).
Root cause research
The 5 "why" method and the Ishikawa diagram were used for the analysis. Several possible causes have been identified, including improper seal selection, improper ventilation, and installation errors.
Determination of root causes
- Incorrect choice of seal - use of seal did not comply with DSTU 2473:2019 standards. Probability: 60%. Confirmed by lack of compliance with ISO 21045:2019.
- Ventilation Errors – The ventilation was not installed correctly, resulting in pressure build-up. Probability: 25%. Confirmed by pressure measurements exceeding 20 bar.
- Installation errors - incorrect installation of sealing and ventilation. Probability: 15%. Confirmed by vibration and temperature measurements.
Remedies
The following actions were used to solve the problem:
- Replacement of seal – use of seal conforming to DSTU 2473:2019 and ISO 21045:2019 standards. Price: 45 €.
- Installation of ventilation - using a ventilation valve that complies with EN 12185:2019. Cost: €30.
- Installation Verification - Using a micrometer and vibration meter to ensure installation accuracy. Price: 25 €.
Quick diagnostic checklist
- Check the sealing temperature (no more than 55 °C).
- Measure the vibration in the sealing area (no more than 8 μs/mm).
- Check the pressure in the system (no more than 350 bar).
- Check the ventilation for blockages.
- Measure the oil leakage (no more than 10 ml/h).
- Check that the seal conforms to DSTU 2473:2019 standards.
- Use a micrometer to check fit.
- Use a vibration meter to check.
- Check the vent valve for EN 12185:2019.
- Use a temperature gauge to check.
- Use a pressure gauge to check.
- Use the diagnostic system to analyze the leak.
Prevention strategy
To prevent the recurrence of the leak, it is necessary to:
- Perform a regular inspection of seals and ventilation every 5000 hours of operation.
- Use vibration and temperature gauges for diagnostics.
- Use seals conforming to DSTU 2473:2019 and ISO 21045:2019.
- Install ventilation in accordance with EN 12185:2019.
- Check the installation of sealing and ventilation.
- Use pressure gauges for control.
Conclusion
Oil leakage in the hydraulic cylinder HYDAC HDA 3840-A-350-124 can be solved by choosing the appropriate seals, correct installation and ventilation. Visit the UNITEC-D E-Catalog for relevant components and diagnostic tools.
List of references
- DSTU 2473:2019 — Seals for hydraulic systems
- ISO 21045:2019 — Seals for hydraulic cylinders
- EN 12185:2019 — Ventilation valves for hydraulic systems
- EN 13794:2016 — Tolerances for hydraulic components
- EN 13795:2016 — Tolerances for hydraulic systems
- ISO 10426:2013 — Diagnostics of hydraulic systems
- ISO 10427:2013 — Monitoring of the condition of hydraulic systems
