Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 09-01-2017, 12:23 AM
Registered User
 
Join Date: Nov 2008
Location: Goodyear, Arizona
Posts: 162
How do you tell if the power steering pump is KAPUT?

Recently I had to replace the power steering hoses on my 1995 E420. This car always felt solid on all four wheels and was probably the best handling car I've ever had.

When I got it back from the shop the steering is not as precise as it was and I now have to thing about the car's tracking as the "feel" is not there anymore.

The only thing I can think of is that when the leak developed I had to drive around five to ten miles with very low PS fluid...could that have damaged it?

Anyone come across this ?

Thanks in advance for your inputs.

__________________
I have never met a man so ignorant that I couldn't learn something from him. -Galileo Galilei, physicist and astronomer (1564-1642)
Reply With Quote
  #2  
Old 09-01-2017, 11:00 AM
Diseasel300's Avatar
Registered User
 
Join Date: May 2016
Location: Texas Hill Country
Posts: 5,190
Can you elaborate on what "feeling" you're missing? The Power-Steering affects the ease that you can turn the wheel. Is the steering wheel now "heavy" feeling? Or is it too light and over-assisted? If the latter, you probably had problems long enough that you didn't notice the lack of assist.
__________________
'11 Honda Accord EX - "The Daily" 70K
'83 500SL Euro - "The Money Pit" 116K
'91 350SD - "Diseasel Jr." 173K
'94 BMW 525i - "The Red Car" 180k
Reply With Quote
  #3  
Old 09-01-2017, 06:32 PM
Registered User
 
Join Date: Sep 2004
Location: Seattle
Posts: 1,939
I don't think a worn pump would give the feeling you are (I think) describing. It sounds more like worn tie rod ends. When my tie rod ends were worn the car would follow ruts in the road. That is the basic symptom I use to diagnose that.
__________________
1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra
Reply With Quote
  #4  
Old 09-01-2017, 06:42 PM
Registered User
 
Join Date: Jan 2012
Posts: 7,515
Was the PS pump buzzing when low on fluid? Is it buzzing now?

Generally, it takes thousands of low fluid miles to do any real damage, and even then, it will just get noisy rather than lose much output pressure. The first signs of real damage would be buzzing / hard steering when the engine is idling and car stopped. This is because the pump is capable of less volume at idle but the steering gear needs more pressure.

If you were driving without any fluid pre repair, the steering would be stiff when stopped and heavy while rolling.

The system probably has lots of air in it from the hose change giving assist , no assist. There are all sorts of brand specific procedures but the easiest one is to drive car, let sit for a few hours or more for bubbles to rise to the top then drive again. In other words, drive it a few days, check fluid once in a while and report back.
Reply With Quote
  #5  
Old 09-04-2017, 06:02 PM
Registered User
 
Join Date: Nov 2008
Location: Goodyear, Arizona
Posts: 162
To answer Diesel's question...after driving again today, the feeling is that the steering is not returning to neutral after any turn. It has to be brought back. And that never happened before.

The steering box in my ancient air cooled VWs used to do that, but they were adjustable. Now I'm wondering if one of those mechanics fiddled with it.
__________________
I have never met a man so ignorant that I couldn't learn something from him. -Galileo Galilei, physicist and astronomer (1564-1642)
Reply With Quote
  #6  
Old 09-04-2017, 06:16 PM
Diseasel300's Avatar
Registered User
 
Join Date: May 2016
Location: Texas Hill Country
Posts: 5,190
That sounds more like alignment or suspension problems. If the power steering system were in trouble the steering would be very hard to turn, but it should still self-return, even if the pump weren't working. The self-centering of the steering is a function of alignment and suspension geometry.
__________________
'11 Honda Accord EX - "The Daily" 70K
'83 500SL Euro - "The Money Pit" 116K
'91 350SD - "Diseasel Jr." 173K
'94 BMW 525i - "The Red Car" 180k
Reply With Quote
  #7  
Old 09-05-2017, 02:45 AM
Registered User
 
Join Date: Apr 2016
Posts: 897
When the power steering is completely kaput, the car drives like an old 3-ton truck built before 1950. Those were pre-power steering trucks, and you could not turn the steering wheel when the truck was not moving. Training on driving those trucks devoted substantial time on positioning the front wheels when you were trying to maneuver the truck; the wheels had to be positioned while the truck was still moving. Generally, the driver position the wheels in the direction he next intended to go before the truck was stopped. (I got my instruction with these trucks when I was a counselor at a Boy Scout camp and when I was in the Army.)

My experience with kaput power steering on my car ( a '98 e 300) happened in early August when the serpentine belt jumped its pulleys and tracks and wasn't turning anything. This happened about a half mile from my home, and I drove the car home where I could work on it. I could not turn the wheels when the car was sitting still; I could turn them with some difficulty when the car was moving. I was able to get the car home but had to make a really wide turn to get it into my driveway, because the usual turn was not possible.

Several months ago, my power steering pump failed. I discovered it failed when I looked under the hood to see where the screeching was coming from. I drove home at that time. The steering was fairly good even thought the system had lost a considerable amount of its fluid.
Reply With Quote
  #8  
Old 09-05-2017, 06:29 AM
oldsinner111's Avatar
love all animals
 
Join Date: Nov 2008
Location: bristol,tn
Posts: 5,715
I ordered parts from here,and rebuilt my pump on the car.Never removed it,just pullled the guts out,and took off belt.I ordered new filter too.

__________________
seems there is hope after all when folks come together
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 11:25 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page