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Power steering whine!

Discussion in 'Volvo Forum' started by Yellow Venom, Dec 25, 2012.

  1. Dec 25, 2012 #1
    Yellow Venom

    Yellow Venom Bobtail Member

    25
    1
    Dec 15, 2012
    Edmonton,Alberta
    0
    I have a 2007 VNL780 and it just started to make a slight vibration on the steering wheel when you let off the throttle and as soon as you touch the throttle it goes away, I think it's the power steering pump starting to go, when it idles at at stop you can feel the power steering whine/vibrate the steering wheel slightly and as soon as you touch the throttle it stops, there's no leaks and oil doesn't stink or anything, anyone have bad the same problem?? I'm guessing just replace the pump???
     
    Yellow Venom, Dec 25, 2012
    Yellow Venom, Dec 25, 2012
    #1
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  3. Dec 25, 2012 #2
    bender

    bender Road Train Member

    2,105
    1,352
    Jul 20, 2010
    Don't Kid Yourself
    0
    Should have a filter in the power steering reservoir. Remove old filter, flush system with new fluid, install new filter, check pump output pressure with guage.
     
    bender, Dec 25, 2012
    bender, Dec 25, 2012
    #2
    CondoCruiser, Yellow Venom and Keyster Thank this.
  4. Dec 25, 2012 #3
    Yellow Venom

    Yellow Venom Bobtail Member

    25
    1
    Dec 15, 2012
    Edmonton,Alberta
    0
    No it's not sluggish at all after you turn it off them on, I changed the steering shaft seal in it and bled it out like it said to do and it worked perfectly all week, then this started, will change filter and see if that works.
     
    Yellow Venom, Dec 25, 2012
    Yellow Venom, Dec 25, 2012
    #3
  5. Dec 25, 2012 #4
    d281833

    d281833 Heavy Load Member

    881
    919
    May 15, 2012
    0
    Yeah you should change the filter once a year, I had one disinegrate and plug all valves in the pump which was a little more expensive than a 20 dollar filter. Learning experience.
     
    d281833, Dec 25, 2012
    d281833, Dec 25, 2012
    #4
  7. Dec 25, 2012 #5
    CondoCruiser

    CondoCruiser The Legend

    19,726
    18,734
    Apr 18, 2010
    Tennessee
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    If you still have air it will show up in the reservoir. It sounds like the pump bearings are going. You have some time once it starts whining. It'll last at least another couple months then the seal will start leaking.
     
    CondoCruiser, Dec 25, 2012
    CondoCruiser, Dec 25, 2012
    #5
  8. Dec 25, 2012 #6
    Pablo-UA

    Pablo-UA Road Train Member

    7,604
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    Oct 11, 2010
    Borispol, Ukraine
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    seems to me PS filter had never beeen changed... and PS pump is bad now

    ZF PS pump and TRW steer box... am I right?
     
    Pablo-UA, Dec 25, 2012
    Pablo-UA, Dec 25, 2012
    #6
  9. Dec 26, 2012 #7
    Yellow Venom

    Yellow Venom Bobtail Member

    25
    1
    Dec 15, 2012
    Edmonton,Alberta
    0
    Am not sure on the pump filter change, I just bought the truck 3 weeks ago, I will get a filter Thurs and change it.
     
    Yellow Venom, Dec 26, 2012
    Yellow Venom, Dec 26, 2012
    #7
  10. Dec 27, 2012 #8
    Pablo-UA

    Pablo-UA Road Train Member

    7,604
    1,642
    Oct 11, 2010
    Borispol, Ukraine
    0
    usually PS pump goes bad with poor maintanance and must be replaced. Check steering box for internal leak in valve body (use TRW manual).
     
    Pablo-UA, Dec 27, 2012
    Pablo-UA, Dec 27, 2012
    #8
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