Results 1 to 7 of 7
  1. #1

    Join Date
    Jan 2004
    Posts
    83
    Location
    Brimfield Ma
    Tractor
    Jinma 354

    Default foaming hydraulic fluid

    I get alot of foam in my hydraulics. this I associate with air getting in the system. I think my back hoe is what's doing this.how could I find out for sure without using 2 more gal of fluid?

  2. #2
    Super Member JerryG's Avatar
    Join Date
    Apr 2000
    Posts
    7,219
    Location
    Northwest Arkansas
    Tractor
    MF 1440-4 PowerShuttle

    Default Re: foaming hydraulic fluid

    The first thing that you need to do it make sure that it is indeed air and not water. Take some out and put it in a glass jar, then wait a couple of days to see if water settles out.

  3. #3

    Join Date
    Apr 2003
    Posts
    179

    Default Re: foaming hydraulic fluid

    This may be a dum question but are you using hyd.fluid or 10 or 20 wt., strait wt. oil will foam in hyd. system, it must be hyd oil diesigned for high pressure use,witch has an anti-foam angent,any oil specifficly for hyd.sys. will have it,but stait oil is avalable and yor loacal vip auto store guy may not know the diffrence.

  4. #4

    Join Date
    Jan 2004
    Posts
    83
    Location
    Brimfield Ma
    Tractor
    Jinma 354

    Default Re: foaming hydraulic fluid

    never dumb questions. its walmart hydraulic fluid for tractors.I think that I will flush out the lines, maybe use 5w30 for a oil then after 20 min I'll drain it and refill with hydraulic fluid.

  5. #5
    Old Timer Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    51,550
    Location
    Central florida
    Tractor
    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: foaming hydraulic fluid

    That oil from walmart is labeled as a universal transdraulic oil... compatible with many specs.. like NH m2c134d.. etc..

    I'd look for a pinhole on a suction line.. ( that or water as someone else mentioned. Easy to tell the difference.. air will clarify when setting.

    Soundguy

  6. #6
    Super Member SPIKER's Avatar
    Join Date
    Jun 2002
    Posts
    5,000
    Location
    Ohio, Jeromesville, Ashland County
    Tractor
    Jinma 284

    Default Re: foaming hydraulic fluid

    I agree with soundguy:

    if the system is full of foam it usually can only get in there on the suction side as a leak on the pressure side will spray fluid out at high velocities!... this means that more than likely the HYD intake filter, intake line or the fitting at the pump will be the biggest culprits. You start it up fluid is low add more fluid and soon it dumps out as the fluid becomes full of air and displaces the actual fluid. one way to help stop this is to always keep the fluid full. (sometimes the fluid will get low enough to suck a bit of air, which foams and the foam fills the system and over flows and next time it is worse.) eventually the pump will cavitate and burn out/seize up. if you have loader & back hoe raise them up high and let set for a day or so, (keep kids & pets away) and let the system settle out for several days, fill it up compleatly anddrop the FEL & hoe down quickly but don't break anything.

    take some brake cleaner and spray around the hyd lines making sure to clean them up and keep an eye out for any little leaks then. the brake cleaner will let the HYD fluid loosen up and wipe it all down. then take tissue paper (paper towel) and wrap it around all the fittings drying them up darn good. let it set a day or two longer and use the paper towels to look for wet spots of hyd fluid. this will tell you where to watch for leaks or where they are.

    anyhow if after setting a few days and filling the hyd system up it still foams then start looking for the intake screen in the hyd resivior to be loose or off and racked lines ... remember it may take several days for the air to raise up and pop the bubbles... and any air that is in the system will drop the tank level fast as it makes it's way back to the hyd tank. every cylinder line and valve will ahve air in it. these will need to be bleeded out very slowly with engine RPM at idle. if you run it too fast the air will get sucked back into the pump & lines and you will have to start over. if it foams really bad right away then check the lines o-rings ect.


    mark M [img]/forums/images/graemlins/frown.gif[/img]

  7. #7

    Join Date
    Jan 2004
    Posts
    83
    Location
    Brimfield Ma
    Tractor
    Jinma 354

    Default Re: foaming hydraulic fluid

    I'll try that Spiker. never thought of a 3 day test for leaks. that should help alot.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
© 2016 TractorByNet.com. TractorByNet is a registered trademark of IMC Digital Universe, Inc. Other trademarks on this page are the property of their respective owners.