How to Clean a Hydraulic Reservoir

Hydraulic Reservoir

How to Clean a Hydraulic Reservoir

Updated: December 22, 2023

Keeping your hydraulic reservoir clean is crucial for maintaining the performance and longevity of your equipment. Over time, contaminants like dirt, moisture, and old fluid can build up, leading to inefficiency or even system failure. Regular cleaning and maintenance are essential parts of a good preventive care routine.

If you're looking to restore your hydraulic system to peak performance, here's a step-by-step guide on how to properly clean your hydraulic reservoir and ensure it runs smoothly for years to come.

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1. Drain the System

Start by draining the hydraulic system while the fluid is still warm. This makes it easier to remove all the old fluid and any sediment that may have settled at the bottom. As you drain, keep an eye out for any signs of contamination, such as cloudy fluid, which could indicate water presence. If you notice this, use desiccant air to dry out the system before proceeding.

2. Clean the Reservoir

Once the system is drained, use a lint-free cloth or a soft brush to clean the inside of the reservoir. Remove any loose paint chips, rust, or sludge that may have accumulated over time. Be careful not to introduce new debris into the system during the cleaning process.

3. Flush with Low-Viscosity Fluid

Next, flush the reservoir with a low-viscosity fluid—ideally one that’s compatible with your system. This helps dislodge any remaining particles or contaminants. You can also use a hydraulic cleaning solvent if recommended by the manufacturer. After flushing, drain the system completely and replace the filters once more.

4. Bleed and Pump the Vent

Fill the reservoir to about three-quarters full, then start the pump and let it run for 15 seconds before turning it off. Repeat this cycle three times. This helps circulate the new fluid and ensures proper venting throughout the system.

5. Test the Pump

Run the pump for one minute with the pressure pump open, then let it rest. Repeat this process a few times, making sure not to run the pump for longer than five minutes at a time. Open the relief valve to check for any trapped air or residual contaminants.

6. Start the Pump

Operate each actuator individually, ensuring that the fluid returns to the reservoir after each operation. Shut down the system between each test and monitor the fluid level. Keep the reservoir filled to about 50% during this phase.

7. Refill and Test the Reservoir

Refill the reservoir to 75%, and run the system in five-minute intervals, bleeding out any air each time. After 30 minutes of continuous operation, replace the filters again. Check for any signs of cross-contamination and replace the filters if needed.

8. Test for System Stability

After completing the cleaning process, run the system for no more than six hours. This allows you to monitor for any signs of instability without risking damage. Replace the filters one final time and take a fluid sample to confirm everything is running smoothly.

Once you’ve done this a couple of times, you’ll be well-equipped to teach others how to maintain their hydraulic systems effectively.

Reach Out to Finishing Systems About Your Hydraulic Reservoir

Finishing Systems has been providing top-quality finishing solutions across the country since the early 1970s. We specialize in helping businesses of all sizes improve efficiency and reliability through expert equipment and service. Whether you’re dealing with hydraulic reservoirs or other industrial systems, we’re here to help.

For more information or assistance, contact us today.

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