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The frequency of changing hydraulic fluid to avoid contamination can vary based on several factors, including the type of equipment, operating conditions, and the manufacturers recommendations. Here are some general guidelines:

### 1. **Manufacturer Recommendations**
- **Follow Guidelines**: Always refer to the equipment manufacturers manual for specific recommendations on hydraulic fluid change intervals, as they may provide tailored advice based on the system design.

### 2. **Typical Change Intervals**
- **Every 1 to 2 Years**: Many hydraulic systems benefit from a fluid change every 1 to 2 years under normal operating conditions.
- **Higher Frequency for Harsh Conditions**: If the equipment operates in extreme environments (e.g., high temperatures, dusty conditions, or heavy loads), consider changing the fluid more frequently, such as every 6 to 12 months.

### 3. **Fluid Contamination Testing**
- **Regular Sampling**: Conduct routine fluid sampling and analysis to check for contamination levels, moisture content, and fluid degradation.
- **Change Based on Results**: If testing indicates high levels of contamination or significant fluid degradation, change the hydraulic fluid regardless of the scheduled interval.

### 4. **Operating Hours**
- **Monitor Usage**: For heavy-use applications, consider changing the hydraulic fluid after a certain number of operational hours (e.g., every 1,000 to 1,500 hours of operation).
- **Adjust for Light Use**: For equipment used less frequently, a longer interval may be acceptable, but regular checks are still necessary.

### 5. **Visual Inspection**
- **Check Fluid Appearance**: Regularly inspect the hydraulic fluid for discoloration, cloudiness, or the presence of particles. Any noticeable change may indicate contamination, prompting a fluid change.

### 6. **Environmental Factors**
- **Consider Operating Environment**: Dusty, humid, or extreme temperature environments can accelerate fluid contamination. Adjust change intervals accordingly.

### Conclusion

Changing hydraulic fluid at appropriate intervals is crucial for maintaining system performance and preventing contamination. Regular monitoring, following manufacturer recommendations, and conducting fluid tests can help determine the optimal change frequency. Prioritizing these practices will enhance the longevity and reliability of hydraulic systems.
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