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  1. #1

    Default Hydraulic Squeal

    I have a 87' kubota B7200 w/front loader. It started this horrable sqeal in the hydraulics yesterday. I had to keep moving the bucket up and down or tilting it all the time to keep the squeal from driving me nuts. I have plenty of hydraulic fluid. I shut the tractor off for about 5 minutes, but was still squealing away after I restarted it. Could it be as simple as air in the lines?? If so any one know how to bleed them. Many Thanks. TK

  2. #2
    Elite Member RobJ's Avatar
    Join Date
    Jul 2005
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    3,471
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    Spring, TX (Houston)
    Tractor
    Kubota L2500

    Default Re: Hydraulic Squeal

    The system should be self bleeding because of the open run back to the rear end. Might be a pump going out, the sound is going away when the pump is under a load.

    Is the motion of the fel and lift arms smooth?

    Bout all I can offer...good luck,
    Rob
    L2500

  3. #3
    Epic Contributor Soundguy's Avatar
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    Mar 2002
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    Central florida
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    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: Hydraulic Squeal

    Could be pump cavitation from an air leak.. but the sound going away when under load is odd.

    Did you check all belts.. to see if something is slipping?

    Are your loader controlls centering correctly. I gues if the spool was stuck.. it may be making the loader relief open if the oil could not get to sump.. but when you are moving the laoder.. oil is going to a cyl.. and not deadheading against a relief valve.

    I think I might put the relief line ( if seperate ) over into a bucket and see if the valve is in constant relief...

    keep us posted...

    Soundguy

  4. #4

    Default Re: Hydraulic Squeal

    RobJ- Yes the fel and bucket will move smoothly with no problem. The bucket does slowly tilt down with no load on/in it. Don't know if that is part of the reason for the squealing. The squealing doesn't happen all the time, just on ocation??? Thanks TK

  5. #5
    Elite Member dfkrug's Avatar
    Join Date
    Feb 2004
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    4,635
    Location
    NorCal
    Tractor
    05 Kioti CK30HST w/ Prairie Dog backhoe

    Default Re: Hydraulic Squeal

    Quote Originally Posted by Soundguy
    Are your loader controlls centering correctly. I gues if the spool was stuck.. it may be making the loader relief open if the oil could not get to sump.. but when you are moving the laoder.. oil is going to a cyl.. and not deadheading against a relief valve.
    This is my thought, too.

    Sometimes it is an embarassingly simple thing, such as: bumping the
    3-pt lift lever up to the relief position by accident. Or a quick coupler
    not fully seated.

  6. #6
    Elite Member
    Join Date
    Mar 2002
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    3,505

    Default Re: Hydraulic Squeal

    Does it have an internal fluid pickup screen that needs to be cleaned, or a servicing stop valve that might be partly closed?

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