Power Steering Fluid Change - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 4 (permalink) Old 09-30-2005, 07:11 PM Thread Starter
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Power Steering Fluid Change

Got some of that fancy synthetic Mercon/Dexron III ATF on the shelf from your tranny fluid change (or tranny swap) that you don't know what to do with? Why not use it to refresh your power steering fluid? It's easy and cheap to do:

Supplies needed:
- 2-3 quarts of fresh Mercon/Dexron III ATF.
- 3/8" inside diameter tubing, at least 3 feet, more is fine.
- shop rags.
- waste oil container (an empty milk jug works great).
- hand vacuum pump or turkey baster (don't use the one from the kitchen or you'll hear about it :blah: issed: )
- pliers (to loosen spring hose clamp)
- step stool, tire step, etc. (optional but makes it easier to get at everthing from the side of the truck.)

1) Using a hand pump or turkey baster, suck all of the old fluid out of the power steering reservoir.
2) Fill the reservoir with fresh fluid.
3) Locate the hose that goes from the power steering reservoir to the brake master cylinder. This is a low pressure hose that just uses a spring hose clamp to hold it on to the brake master cylinder, near the top, right behind the brake fluid reservoir.
4) Remove the PS hose from the top of the brake master cylinder and attach a piece of 3/8" I.D. tubing to the nipple on the brake master cylinder and route the tubing to a waste container.
5) Fire up the engine.
6) Pump the brake pedal a few times. This will force old fluid out of the system into the waste container.
7) Top off the power steering reservoir with fresh fluid.
8) Repeat steps 6&7 until you've put 2-3 quarts of fresh fluid into the system.
9) Shut off the engine.
10) Replace the hose on the brake master cylinder.
11) Ensure power steering reservoir is at the proper level.

Enjoy a healthy and quiet PS system!

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post #2 of 4 (permalink) Old 09-30-2005, 08:22 PM
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Gary...Awesome write up. :Thumbup: I've been wanting to do that for some time now but didn't know how.


post #3 of 4 (permalink) Old 09-30-2005, 09:30 PM Thread Starter
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You bet!

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post #4 of 4 (permalink) Old 12-15-2007, 08:37 PM
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just a heads up, this will only reliably flush the pump, reservoir, and hydroboost portions and not necessarily the steering box and cooler portions.

here are ford's directions to flush the entire system, just for what its worth. basically the same, except you pump out of the full system return line, instead of the shortened pump->hydroboost->reservoir return line. They both should theoretically flush all of it, but this way might be faster:
__________________________________________________ _______________

WARNING: Do not mix oil types. Any mixture or any unapproved oil can lead to seal deterioration and leaks. A leak can ultimately cause loss of fluid, which can result in a loss of power steering assist.

Remove the injector driver module (IDM) relay to prevent engine starting.

Disconnect the power steering return hose (3A713) (the return line from the steering box, not the hydroboost). Plug the reservoir fitting.

Attach an extension hose between the power steering return hose and an empty container.

Raise the front wheels off the floor.Fill the reservoir.

CAUTION: Do not crank the engine for more than 15 seconds at a time. Allow the starter to cool for 1 minute before cranking again. Premature starter failure can occur.

CAUTION: Do not hold the steering wheel against the stops for more than three to five seconds at a time. Damage to the power steering pump could occur.

Turn the steering wheel from stop-to-stop while cranking the engine until the fluid exiting the power steering return hose is clear of all contamination and foreign material.
Fill the reservoir.

Lower the vehicle.
Disconnect the extension hose from the power steering return hose. Remove the plug. Attach the power steering return hose to the reservoir.

CAUTION: Do not overfill the reservoir.

Fill the reservoir.

Install the IDM relay.

CAUTION: Do not hold the steering wheel against the stops for more than three to five seconds at a time. Damage to the power steering pump could occur.

Start the engine and turn the steering wheel from stop-to-stop.

NOTE: If the power steering system is noisy and accompanied by evidence of aerated fluid it will be necessary to purge the power steering system.

Check the power steering fluid level.

hope this helps someone out.


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