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Thread: Power steering not assisting

  1. #1
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    Power steering not assisting

    94 Range Rover classic, 3.9V8. I have an intermittent problem with the power assisted steering; it will often fail to provide any assistance, i.e. the steering will be very heavy. I noticed tonight that when this happened, there was none of the labouring sound usually associated with the power steering being over-worked. I'm thinking it is most likely the pump failing, I have a pump that came off a 97 Disco that I can swap (assuming it is the same, haven't had a good look yet), just wondering if there is some other common fault that may cause these symptoms, or if there is some adjustment to make. The box has a minor weep at the sector shaft seal but otherwise feels nice and tight, there is no leak at the pump, there is no noise from the pump at idle, no other symptoms except the intermittent very heavy steering in parking situations.

  2. #2
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    have you checked to make sure its not just the belt slipping......?

  3. #3
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    Also check that the uni joints on the steering shaft haven't seized, does the steering self centre OK ?


    Martyn

  4. #4
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    Certainly no squealing or other signs that the serpentine belt may be slipping. Doesn't have the lumpy feel of seized shaft uni joints, and the problem is intermittent, albeit getting more and more frequent. Vehicle drives beautifully except when parking or maneuvering at low speed.
    I have a couple of dead power steering boxes waiting to go to the scrap man, might pull one apart and investigate what valving there is.

  5. #5
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    Quote Originally Posted by Bushie View Post
    Also check that the uni joints on the steering shaft haven't seized, does the steering self centre OK ?


    Martyn

    Intermettant and getting worse, again, check the unis

  6. #6
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    I had a similar problem which turned out to be a rusty/seized swivel pin.

  7. #7
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    also check that the track rod and drag link arent bent and rubbing anywhere.....

    otherwise......if its all on a serpentine belt.....it sounds like a lazy or worn out pump.......
    there is also a bleed screw on the top of the box you can crack open to see if theres any air.......

  8. #8
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    Thanks for the responses. I'll check all the suggested items. I'm fairly sure though that it is a lack of hydraulic assistance due to either the box or the pump, as there would be signs of the hydraulics laboring if it was a component binding downstream of the box. Might get a chance to check it over tomorrow arvo before going to work, will check the input unis, drag link etc. Will also check if the disco pump looks the same, wasn't such a difficult thing to remove. Be just my luck it is the box, I had to put a new one in my other Rangie just a couple of months back.

  9. #9
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    Checked all the above suggestions the other day, nothing fouling anywhere, jacked up the front end and the steering goes from lock to lock smoothly, pretty confident the unis are okay. Yesterday I swapped out the power steering pump for the known good unit off the Disco- seems thus far to have solved the problem (touch woodgrain trim).

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