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Unread 03-02-2008, 07:57 PM   #1
Jeeples
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New power steering pump and pressure hose, now excessive pump noise

So I replaced the power steering pump and the high pressure hose on my fiance's Jeep. The old pump had a small crack in the resevoir and the pressure hose leaked on the pump side fitting as well.


Aside from not having the fan clutch side of the pressure hose completely tightened, everything went pretty smooth. Immediately upon start up there was a lot of pump noise, which quieted down a bit after the fluid circulated throughout the system. However there is definitely a good amount of noise coming from the pump, higher RPM's and turning to full lock only makes the sound worse.

I'm no stranger to working on cars, and to me it sounds a lot like a bad bearing in the pump, and it certainly is possible to have purchased a bad unit straight out of the box. I wanted to make sure I used the right fluid, so I originally purchased some from the local dealer.

My only concern is that in the past, other dealer's have given us the MOPAR Power Steering Fluid +4 to use, and it had worked just fine. This time however the dealer gave me MOPAR branded power steering fluid. Even on the back of the bottle is says for use in 2004 and older Jeep Grand Cherokee's, and 1998 and older Chrysler vehicles.

I would much rather flush the system then go through and order a new pump and swap it out. Which is the correct fluid to use? Any other thoughts on what this could be?

Thanks!

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Unread 03-02-2008, 08:17 PM   #2
SpeedyCat3
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I remember that when changing a P/S pump and reservoir a long time ago, I had to cycle the steering both ways a couple of times while adding fluid to eliminate the bubbles.
It could still have some air in the system, since you disconnected all the lines, the fluid leaked all out from it.
At full steering lock they always make noise, some more than others.
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Unread 03-02-2008, 08:23 PM   #3
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Right, I understand that the pump will be noisier at full lock, but this sounds like a resevoir full of marbles, definitely not the 'strained' pump noise that is common at full lock.


Perhaps I'll drain the system again and try turning the wheels while adding fluid. I simply topped off the resevoir and with the wheels off the ground, turned lock to lock 10 times upon initial startup.
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Unread 03-02-2008, 08:31 PM   #4
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Maybe there are some marbles inside....
You sure nothing dropped in there...
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Unread 03-02-2008, 08:32 PM   #5
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You need to bleed the system. Most shop manuals require you to turn the wheels lock to lock 40 times with the wheels off the ground as a bleeding procedure. Any air in the system will cause a lot of noise.

On one vehicle I had a noisy pump that wouldn't quiet down no matter what I did so I ended up replacing it with another new one.
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Unread 03-02-2008, 09:04 PM   #6
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Any power steering fluid will work just as well as Mopar stuff.

It might appear that you purchased a bad “new” pump. Turning the wheel both directions many times, is a necessary as Upside stated. I do this with the engine off and the vehicle jacked up and the cap off the reservoir.

My power steering reservoir has a fine crack in it as well (for the past year now)
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Unread 03-02-2008, 09:05 PM   #7
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I believe mine has a crack too, since It leaks and have not been able to find where from.
Not to highjack..
Just as a curiosity, is there another steering box that can be used as a chep upgrade for the stock ZJ.
I'd like to get rid of some play, and at the same time upgrade a bit if possible.
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Unread 03-02-2008, 09:42 PM   #8
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Quote:
Originally Posted by Speedycat View Post
I believe mine has a crack too, since It leaks and have not been able to find where from.
Mine leaks at the seam of the two halves, if that helps.
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Unread 03-03-2008, 12:43 AM   #9
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Quote:
Originally Posted by Upside View Post
You need to bleed the system. Most shop manuals require you to turn the wheels lock to lock 40 times with the wheels off the ground as a bleeding procedure. Any air in the system will cause a lot of noise.

On one vehicle I had a noisy pump that wouldn't quiet down no matter what I did so I ended up replacing it with another new one.
Ok, I'll give that a shot tomorrow, hopefully I just didn't get the system bled very well.

Quote:
Originally Posted by greasefingers View Post
Any power steering fluid will work just as well as Mopar stuff.

It might appear that you purchased a bad “new” pump. Turning the wheel both directions many times, is a necessary as Upside stated. I do this with the engine off and the vehicle jacked up and the cap off the reservoir.

My power steering reservoir has a fine crack in it as well (for the past year now)

I figured as much once I saw the MOPAR spec rating on the bottle, but like I said, I had been given the MOPAR Power Steering Fluid +4 from a different dealer, which made me concerned about the fluid type.

I'm still hoping that the system just needs to be bled, but if I have to, I can pickup another pump under warranty.
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Unread 03-03-2008, 12:46 AM   #10
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Quote:
Originally Posted by Speedycat View Post
I believe mine has a crack too, since It leaks and have not been able to find where from.
Her's had a small crack on one of plastic nipples for the return line, most likely caused when the fluid was last serviced. It was also leaking from the pump side fitting on the high pressure line, which MOPAR fixed with an updated pressure hose.

I wouldn't have messed with it, if it wasn't for the fact the leak was getting progressively worse.
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Unread 03-03-2008, 08:13 AM   #11
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Are you sure you don't need the special hydraulic fluid/power steering fluid? My '04 calls for it due to the hydraulic fan setup.

It cost a few dollars more per quart. I believe the part number is listed on the www.wjjeeps.com website.
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Unread 03-04-2008, 07:03 PM   #12
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I called up a couple dealers and talked with a couple different techs, they all confirmed that standard MOPAR Power Steering fluid is what is required, regardless of the style of cooling fan.

The vehicle sat overnight and I double checked for leaks, after taking it for a short ride on some nearby roads, everything is nice and quiet. I assume the system wasn't completely bled and that's where my pump noise was coming from.

Went ahead and replaced the serp belt as well, since it still had MOPAR numbers written on it.
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Unread 03-04-2008, 07:17 PM   #13
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If the power steering fluid is coupled to the hydraulic fan, which mine is not, then I would absolutely stick with the OEM stuff; as mixing fluid types in this situation be detrimental! I did not realize the some Jeeps did this. Thanks, Jeeples, for pointing this out. The common sealed (and not shared) hydraulic or viscous-coupled fan, has silicone oil in it.
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Unread 03-15-2011, 04:29 PM   #14
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Quote:
Originally Posted by Jeeples View Post
So I replaced the power steering pump and the high pressure hose on my fiance's Jeep...Immediately upon start up there was a lot of pump noise, which quieted down a bit after the fluid circulated throughout the system. However there is definitely a good amount of noise coming from the pump, higher RPM's and turning to full lock only makes the sound worse.

Any other thoughts on what this could be?
Was this a rebuilt pump from a parts store by any chance? I have been disappointed with the rebuilt units (like James Dean, they live fast and die young). Next time I replace mine, I'm pulling one from a boneyard ZJ with a tow package.
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Unread 03-15-2011, 04:59 PM   #15
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Have had some problems with cardone. Resevoir leaked on first one. Wound up getting one without a resevoir and using my old one. Also I would run it awhile and take a suction gun and pull some of the fluid out ,putting in new until the fluid stays clean. My gearbox had some nasty in it.
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