Often characterized by "must make" moves, i. Kaye is an extreme sports addict with a kind heart and an axe to grind with her childhood sweetheart and ex-husband, renowned writer Samuel Caulfield Cabral. Kaye is determined to unearth the reasons behind the death of their marriage and why two people who lived to love each other were driven apart, all leading to startling revelations about Samuel, about life, and about herself. She soon realizes that maneuvering the tumultuous waters of her relationship with Samuel will prove as dangerous as any outdoor adventure she might attempt She also loves to explore the world, thanks to countless family minivan trips across the States to coastal cities and national monuments.
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Among the ideas mentioned involved using brake cleaner, diesel fuel or some type of acid cleaning. However, brake cleaner includes a number of chemicals such as acetone and tetrachloroethylene. These solvents are known to cause problems for nitrile, neoprene, millable polyurethane and silicone seals.
Ethylene-propylene EPDM seals have a very poor petroleum oil and solvent resistance, and are not recommended for exposure to aromatic hydrocarbons or diesel oil. There is also the issue of compatibility with the new type of fluid that has been chosen. It involves mechanical and chemical cleaning of both the components and the system.
Step 1 While the fluid is at operating temperature, completely drain the system, paying attention to the reservoir, all lines, cylinders, accumulators, filter housings or any area of fluid accumulation. Also, replace the filters. Step 2 With a lint-free rag, clean the reservoir of all sludge and deposits. Make sure the entire reservoir is free of any soft or loosened paint.
Step 3 Flush the system with a lower viscosity fluid that is similar to the fluid to be used. A Reynolds number between 2, and 4, should be selected to achieve enough turbulence to remove particles from the lines.
Stroke valves frequently to ensure they are thoroughly flushed. Step 4 Drain the flushing fluid as hot and as quickly as possible. Step 5 Fill the system to approximately 75 percent with the fluid to be used. If the pump has a pressure relief or bypass, it should be wide open. Run the pump for 15 seconds, then stop and let it sit for 45 seconds. Repeat this procedure a few times to prime the pump. Step 6 Run the pump for a minute with the bypass or pressure relief open. Stop the pump and let it sit for a minute.
Close the bypass and permit the pump to operate loaded for no more than five minutes. Allow the relief valve to lift to confirm that it is flushed as well.
Do not operate the actuators at this time. Stop the pump and let the system sit for about five minutes. Step 7 Start the pump and operate the actuators one at a time, allowing fluid to return to the reservoir before moving to the next actuator. After operating the final actuator, shut down the system.
Keep an eye on the fluid level in the reservoir. If the level drops below 25 percent, add fluid and fill to 50 percent. Step 8 Refill the reservoir to 75 percent and run the system in five-minute intervals. At each shutdown, bleed the air from the system. Pay close attention to the system sounds to determine if the pump is cavitating. Step 9 Run the system for 30 minutes to bring it to normal operating temperature.
Shut down the system and replace the filters. Inspect the reservoir for obvious signs of cross-contamination. If any indication of cross-contamination is present, drain and flush the system again. Step 10 After six hours of operation, shut down the system, replace the filters and sample and test the fluid.
Step 11 The sampling frequency should be increased until you are confident that the system fluid is stable. Flushing Tactics There are a lot of different ways to flush out a machine. You want to match the flushing method to the flushing condition. Temperatures in the range of to degrees F are generally targeted. A wand on the end of a flushing hose is used to direct high-velocity oil flow to loosen deposits or for picking up bottom sediment. Some adherent machine deposits require tactics that are more aggressive than a high-velocity flush, so you must match the flushing tactic and strategy to the problem you are trying to resolve with the flush.
Once you understand the problem within the machine that needs to be cleaned, you can then select the appropriate flushing tactic to remedy it. At this point, it should be obvious that a fluid changeout is not just a drain-and-fill operation. Care must be taken to confirm that the system is as clean as possible prior to introducing the new fluid. Most changeover procedures suggest that some of the old fluid will need to be either drained off the bottom or skimmed off the top of the reservoir after a period of time.
Taking the time to verify that the system is fully flushed and purged of the old fluid prior to introducing the new fluid will go a long way toward ensuring a healthier hydraulic system. Read more on hydraulics best practices:.
Advantages & Disadvantages of Hydraulic Systems
11 Simple Steps for Flushing a Hydraulic System
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