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Old 05-17-2012, 01:48 PM
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Replacing a power steering pump on a 4.7L

Those with the 4.7L and hydraulic cooling fan know there are a few problems with the power steering system. The first problem was the original pressure hose typically starts leaking at the pump fitting. This is easily fixed with the redesigned hoses available. The second problem is inevitably the pump will wear out, especially if like me you ran with the hose leaking for a while and weren't diligent enough at topping off the fluid.

To replace the pump you will need:

- new/reman power steering pump (I got one that included the reservoir, you can save a few bucks getting just the pump but mine looked like it was starting to split in the back).

- new pulley (you could use a puller to reuse the old one, but mine had a chip in it, and for $12 why not?)

- 1 or 2 new small hose clamps

- 1 quart of PS fluid (Mopar 5931 equivalent, which after checking a few labels most parts stores carry a fluid that is)

For tools I believe it was a 1/2 inch deep socket that I used to pull the bolts holding the pump in place, a wrench to rotate the belt tensioner, a 21mm wrench for the pressure hose fitting, and a pliers to remove the hose clamps. Also, a screwdriver or appropriate socket to tighten your new hose clamps.

I recommend using a press to press the pulley onto the pump, mine came with a bolt/nut/washer "tool" that I was able to press it on with, but it was a pain in the ass. Doable, but if you have access to a press (I forgot I could have asked the shop guys at work to do it) it will be much easier.

Here are the steps I took to swap out the pumps:

1. Remove the drive belt, set aside. This would be a good time to inspect it and replace if it is old or cracking.

2. Remove the pressure hose from the pump. Once it was out I tipped it down to drain some of the fluid out of it, then wrapped a rag over the end and bent it out of the way.

3. Loosen and remove the 3 bolts holding the pump to the engine. I used a 1/2" deep socket, my short socket with extension was too long and hit the fan shroud.

4. Once the pump is loose, I turned it on its side to remove the 2 return lines (one from the fan, one from the gear/cooler). I found one of them had a "constant tension" style band clamp on it, the other had a crimp on single use clamp, so I carefully pried that loose, and then went to the parts store for a new worm drive band clamp. The hoses may need some convincing to come off, but be careful not to damage them.

5. I now found that there wasn't much room to remove the old pump, so I took off the upper radiator hose and was able to get it out that way. I then grabbed the new pump and slid it back in the opposite way I pulled out the old one.

6. Reattach the return hoses. They slid right on, then I just had to tighten up the hose clamps to hold them in place.

7. Next I bolted the pump back to the engine. I started each one by hand to make sure they went in right, and then tightened them up good with the ratchet.

8. Next I reattached the pressure hose. Make sure you have an o-ring on the end of it, my pump came with a new one.

9. I then put the cap on and reattached the radiator hose. Since I didn't lose much coolant (not even down in the radiator) I just pulled the bleed plug and topped it off. No gurgling noises, everything is good there.

10. Fill 'er up! It took 1 16 oz. bottle to fill up the reservoir, and I spun the pump by hand a bit to hopefully prime it. Then I re installed the drive belt.

11. Start your engines! It squealed a bit at first when I started as it worked the air out, but then quieted down. I turned the wheel back and forth to work the air out and topped off the fluid as needed.

12. Wipe off the old pump and pack it in the box for the core return. (If you bought a reman pump).

Wow, I didn't even realize how bad the pump was getting until I drove it around with the new pump. Its super quiet and smooth now at idle like going in and out of a parking space, and it takes less effort to turn overall. $120 at Advance Auto was well spent for the improvement, especially before cold weather sets in again and the condition gets worse. <- thats for your Dave!

Wow that got kinda long winded, but its really not that tough a job to do. Took me a little over 2 hours including muscling the pulley onto the new pump. Sorry there's no pics, but I forgot and it wasn't that interesting of a job lol.
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Old 05-17-2012, 05:17 PM
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Re: Replacing a power steering pump on a 4.7L

Nice post Aaron, i hopefully donīt have to do this soon though.
To speed up the dearation of the hydraulic system, you could remove the coolant temp sensor connector (in between the AC compressor and alternator) and the fan goes then to high speed mode, increasing the hydraulic flow and consequently getting the air out quicker. It will only set a DTC and you get the check engine light, so a scanner is needed to reset that afterwards.
To prevent any wear to the tires, you could use 2 sheet metal plates or even some hardwood and put a little grease between them and drive the front wheels on top of them. When you then turn the wheels, only the upper plate will turn and you wonīt get any wear on the tires themselves. You have to make 20 full turns for a complete dearation.
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Old 05-17-2012, 07:47 PM
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Thanks frank! I forgot about the temp sensor option. I wasn't worried about tire wear though these are about shot.


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Old 05-17-2012, 08:46 PM
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Re: Replacing a power steering pump on a 4.7L

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Originally Posted by 01grand View Post
Wow, I didn't even realize how bad the pump was getting until I drove it around with the new pump. Its super quiet and smooth now at idle like going in and out of a parking space, and it takes less effort to turn overall. $120 at Advance Auto was well spent for the improvement, especially before cold weather sets in again and the condition gets worse. <- thats for your Dave!
Yeah,yeah I know broski.You're starting to sound like my wife.She's been bitchin that I better fix that before we start camping cause she doesn't want to hear me bitchin I don't think there's any assist at all in parking maneuvers any more. Sad part of it is the new pump and pully have been laying on the bench for a while now right next to my Rhino'd pans.Just have some weird aversion to this job for some reason. Thanks for this post bro. I shall print it and use it for my destructionsOne question bud. I keep seeing references to some kind of filter in the low pressure return. You see or change anything like that?
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Old 05-17-2012, 09:43 PM
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Re: Replacing a power steering pump on a 4.7L

[QUOTE=01grand;631087]

I recommend using a press to press the pulley onto the pump, mine came with a bolt/nut/washer "tool" that I was able to press it on with, but it was a pain in the ass. Doable, but if you have access to a press (I forgot I could have asked the shop guys at work to do it) it will be much easier.


I wonder that if you use a press to install the pulley in place, if you would not overload the pump bearings. With the special tool, which is also mentioned in the jeep manual, you only put forces on the pump axle itself and not on the bearings or the pump housing. Just a thought.
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Old 05-17-2012, 09:59 PM
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Re: Replacing a power steering pump on a 4.7L

Man this post couldn't have come at a better time I've been leak for a few weeks now! ); looks like it might be the house haven't really looked into it yet but will soon
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Old 05-18-2012, 02:00 PM
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Re: Replacing a power steering pump on a 4.7L

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Originally Posted by Gtx15 View Post
Man this post couldn't have come at a better time I've been leak for a few weeks now! ); looks like it might be the house haven't really looked into it yet but will soon
If it looks like its leaking around where the pressure hose mounts to the pump, its almost guaranteed you need to replace the hose. Pretty straight forward, all you need for that job is a 21mm wrench and some fresh fluid. The problem is the steel line starts to leak around the fitting, and a new o-ring (in my case anyway) did not solve the problem.
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Old 05-18-2012, 02:06 PM
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Re: Replacing a power steering pump on a 4.7L

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Originally Posted by cheapjeep View Post
Yeah,yeah I know broski.You're starting to sound like my wife.She's been bitchin that I better fix that before we start camping cause she doesn't want to hear me bitchin I don't think there's any assist at all in parking maneuvers any more. Sad part of it is the new pump and pully have been laying on the bench for a while now right next to my Rhino'd pans.Just have some weird aversion to this job for some reason. Thanks for this post bro. I shall print it and use it for my destructionsOne question bud. I keep seeing references to some kind of filter in the low pressure return. You see or change anything like that?
Ha, sounds like a win wiin situation, although if you're like me you will find something else wrong with the jeep to bitch about! Get 'er done Dave, if I can do it you can! Probably a good idea to fix it before you start adding extra weight to the thing with that trailer too.

I believe there is an option for a fluid filter on the return side, it would just clamp in somewhere mid line. I do not have one, or at least didn't see one. Not sure if its all that necessary if you do a good job flushing it, any debris in the system would probably be the result of another problem before it causes a problem. Unless you run around without the cap on the res. lol.

Its now just as smooth in a parking lot as it is out on the road, I was worried a new pump wouldn't make much difference because the problem was only when parking/backing up but I couldn't be happier.
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Old 05-18-2012, 03:02 PM
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Re: Replacing a power steering pump on a 4.7L

That where my problem is I think!
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Old 05-18-2012, 03:44 PM
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Re: Replacing a power steering pump on a 4.7L

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Originally Posted by Gtx15 View Post
That where my problem is I think!
Yep, that looks like how mine was, you need the new redesigned hose. You can get it from a dealer or justforjeeps.com, they are a vendor here, not sure if we get a discount from them but you could ask.
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Old 05-18-2012, 04:27 PM
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Re: Replacing a power steering pump on a 4.7L

You get 5% discount on parts until $ 99,99 and 10 % discount when above $100 with www.justforjeeps.com.
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Old 05-18-2012, 04:58 PM
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Re: Replacing a power steering pump on a 4.7L

Nice post..... This applies to 4.7 only???
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