소개
The most often neglected fluid and filter on the W123 cars is the power steering fluid and power steering filter.
Learn to change yours today, and extend the life of your pump and steering gear box.
필요한 것
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Jack up the front of the car so you can turn the steering wheel while the car is stationary.
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See the guide on jacking up your car, if you need guidance on this.
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To start the process of changing your power steering fluid, you'll need to remove the lid on the pump reservoir.
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If you want guidance on this, and on checking the fluid level, see the guide on checking power steering fluid level.
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Replace the spring, retainer and nut over the filter and tighten down. The spring should still have some room to expand and contract but should be snug.
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Fill the reservoir to the bottom of the metal rim around the top of the pump housing.
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This car is getting power steering fluid, instead of automatic transmission fluid. Both are OK. The power steering fluid is clear.
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Now, turn on the engine. Be sure the car is in park or neutral first. Turn the steering wheel left and right, as far as it will go, a few times to get out any air.
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Top off the fluid as needed. Never let the pump run dry.
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If your fluid is very dirty, simply repeat the process of sucking out fluid, putting the filter back in, filling the reservoir, and then running the engine and turning the wheel until it looks clean.
You really want to flush the fluid properly. Disconnect the return hose to the reservoir and have a friend run the engine. Collect the fluid now pumping out of the hose whilst you top up with clean fluid. When the hose runs out of dirty fluid and you see the colour of the new fluid, cut the engine. Top up to the correct level and the flush is complete.
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Finish by re-installing the cap and taking it for a test drive.
Finish by re-installing the cap and taking it for a test drive.
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댓글 14개
I find this tutorial so simple to follow. I prefer images and text to video. Well done!!!
Holden, I am glad it was helpful! I agree, I usually prefer good pictures and text to a video - no need to rewind when you miss something.
Agreed. Very well done !
Thank you so much for your detailed guides! What sort of symptoms could we expect if the power steering fluid or filter need replacing?
This was so professional; technical writers take notice!
Question: Why do I need to jack up the car? Can't I just turn the wheels with the tires on the ground?
You could. However, turning the wheels while the car is on the ground and not moving puts substantial strain on the pump. If the front wheels are hanging freely in the air that is not an issue. Your pump, your car, your choice :) I would jack it up.
How often should you ideally replace the fluid and filter? I’m guessing every other year…
On my old mustang I leave the low pressure hose off into a bottle and run the engine for a couple of seconds to drain the old PS oil in the system. New oil in the PS a pump reservoir, obviously. Can this be done on the ‘85 300D? I don’t see this hack on any of the forums? Thanks
How much oil do you need for a full change? Thank you
Too bad this great ifixit is wrong. Just like any other W123/300D fluid change there is a proper DRAIN PLUG at the lowest point on this system on the bottom of the steering box! Put your drain pan under the steering box by the knuckle and the drain plug is right next to it. Remove the plug and it drains the whole system, lines, steering box and all...not just the reservoir. Replace the plug after you swap out filters and the whole system will have fresh MERCEDES steering fluid. Plug in and retightened refill then start diesel and swing from lock to lock to bleed.
Thankyou so much !
You should have been a teacher 😜
Maybe you are you ,never the less ,Thankyou 🙏
I have a 1978 W123 250 straight 6 and wondering if the process is the same as what you have just explained with your model ?
