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You have just finished replacing the power steering pump on a customer’s vehicle. You start the engine and to your surprise the pump still makes noise. Now it’s easy to kick yourself at this point and think, where did I go wrong? I would encourage you to take a step back and re-evaluate things. There are several questions you should ask yourself in this scenario. Did you flush the system? Did you use the correct type and quality of fluid, and did you bleed the system after repair? Let’s start with the first. Flushing the system. Anytime you replace a major power steering component such as the steering rack or pump, you should at the very least evaluate the condition of the fluids and potentially flush the entire system. This is especially important in the case of, say, an internal pump failure. This can cause metal shavings to enter the fluid circuit, potentially causing damage to other components later on.
If the fluid is dark, smells or is contaminated, it is best to replace it by flushing the system. That brings us to the second point, choosing the right type, grade, and quality of power steering fluid. Power steering fluid isn’t universal from one automaker to the next. Some brands will use automatic transmission fluid, ATF, depending on the model year of application. Asian imports may use a special type of power steering fluid, which is a mixture of hydro base oil and synthetic base oil with special additives. Luxury imports such as Mercedes-Benz and BMW may use hydraulic oil, which looks and smells different from traditional power steering fluid. The point here is that you need to do your due diligence when choosing what fluids to put in your system during a repair. Also keep this in mind whenever you are trying to diagnose a noise problem. Your customer may accidentally add the wrong type of liquid causing abnormal noise. So-called universal power steering fluid bottles may claim that they contain all the necessary additives, but this is not always the case.
Finally, the system may need to bleed to remove air pockets from within the hydraulic circuits. This varies greatly from one automaker to the next, so your best resource is OE service information. For example, the 2016 Chevy Traverse has to lift its front wheels off the ground. Then the long transmission funnel needs to be placed into the power steering fluid reservoir and filled near the top with fluid. With the ignition key, engine off, turn the steering wheel from lock to lock 10 to 20 times, checking the fluid level periodically, then start the engine and repeat this process, being careful not to let the wheel catch the steering lock. Stop the engine, drain excess fluid from the long funnel and drain it from the reservoir. Increase the liquid level one last time, and do a test run.
If the pump is making noise but the system is operating normally, consider adding a Rislone Steering Stop Whine with leak repair to the reservoir. You can solve this problem with just one bottle. Steering Stop Whine with leak repair will reduce noise, stabilize power steering fluid, and solve hard steering problems. Steering Stop Whine with leak repair is a 100% universal additive, which will work with all types of hydraulic power steering systems. I’m Brian Sexton. Thank you for watching.
This video is sponsored by Rislone.
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