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How to Flush and Bleed a Power Steering System

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How to Flush and Bleed a Power Steering System
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HOW TO FLUSH THE POWER STEERING SYSTEM...


WHEN CHANGING THE PUMP or DOING MAINTENANCE FLUSHING

  1.    Connect the pressure line to the pressure fitting on the pump
  2.    Cap or plug return fitting on the pump; place return line from the gear or  rack into a waste container.  
  3.    With a helper
            a.    Fill power steering reservoir with Power Steering Fluid
            b.    Start the Engine
            c.    Have helper continuously add fluid to the reservoir while you are turning the steering slowly from stop to stop.

DO NOT ALLOW PUMP TO OPERATE WITHOUT FLUID!

            d.    Keep turning steering wheel from stop to stop while adding fluid, until fluid in coming out of the return hose is clear and clean.
  4.    Stop engine and remove cap/plug on return fitting and reconnect return line to return fitting on the pump.
  5.    Fill with P/S fluid, check for leaks & bleed the system.


WHEN CHANGING THE RACK & PINION OR GEAR BOX

  1.    Place the gear or rack end of the pump hose into a waste container.
  2.   Cap or plug return fitting on the pump
  3.   With a helper
            a.    Fill power steering reservoir with Power Steering Fluid
            b.    Start the Engine
            c.    Have helper continuously add fluid to the reservoir. 

DO NOT LET PUMP RUN DRY!

            d.  Do this until fluid coming out is as clean as fluid going in .

  4.   Stop engine. Connect pressure and return lines to Rack / Gear.  Remove cap/plug on return fitting and reconnect return line to return fitting on the pump.
   
        Fill with P/S fluid, check for leaks & bleed the system.


HOW TO BLEED A POWER STEERING

To bleed the system, make sure the reservoir is full of P/S fluid then start the engine.  Then slowly start turning the steering ¼ turn in each direction, then ½ turn, etc. until you have reached  the stops on both sides.  Stop the engine, check fluid level in reservoir (add fluid if necessary) and note any aeration or bubbles in the fluid.  If air is still present in the system  let the vehicle sit for a few minutes and then repeat the process.

NOTE:  Some Ford units are difficult to bleed.  In extreme cases a vacuum pump may be necessary to bleed all the air out of the system.


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