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  1. #1
    Silver Member
    Join Date
    Jul 2003
    Posts
    125
    Location
    Jewel Lake, ID

    Default Jerky Hydraulics

    Hi All,

    I have just started having problems with the hydraulics with my Shibaura D23F. When I raise the FEL or 3-pt the motion is slow and jerky, it sort of starts and stops irregularily. Lowering works fine, nice and smooth. In addition, the power (pressure) seems to be down, I have trouble now lifting the front end with the FEL. The last couple of days are the first time I have run the rig in cold weather.

    OK, here's some history, I bought the tractor this spring, I think it's around a '90 model. After a month or so of use, my trans light came on as the fluid warmed up, when it got really warm, or if the RPMs were low it would go off. Based on some feedback on this forum, I was led to believe I probably had water in the fluid. I drained the fluid and changed it and the filter, it did look nasty, kind of milky. I put in new fluid, problem was much reduced. I chanced fluid and filter a second time, to further purge any moisture, things seemed fine. I ran the tractor for several months with no further problem.

    I just pulled the pressure relief valve apart, I was thinking it might not be sealing and not letting the system achieve pressure properly. I did clean some grunge out, but no help. The problem seems to be varying pressure, but I don't have a gauge on the pressure line to check, yet.

    Given that the pressure seems down and flow seems "intermittant" (and I can hear fluid hydraulic fluid moving in the lines that doesn't sound smooth, I dont know how to describe). I was wondering if I am cavatating due to some restriction on the suction line of the pump? Is it possible that there is a suction strainer that may be partially plugged? Letting the tractor warm doesn't seem to help and the problem seems to be there at all engine speeds.

    More questions-where is the hydraulic pump located on this tractor, or in general where are they usually located? I have some experience with industrial hydraulics, but not much with tractors. Also, if there is a strainer in the line, or anything else that may be getting plugged, where would I find it? If there isn't a restriction of some sort in the suction line to the pump, I am assuming the pump is going bad. I understand that tractors typically use gear pumps, I assume these aren't too expensive, does anyone know what one should run? One more question, I am assuming that the spin-on hydraulic filter is on the return line to the reservoir/transmission and not on the suction line to the pump. Is that correct?

    Thanks for any help you can offer.

    Brian

  2. #2
    Super Star Member Egon's Avatar
    Join Date
    Aug 2001
    Posts
    17,786
    Location
    Nova Scotia, Canada

    Default Re: Jerky Hydraulics

    Brain:

    Check the joystick linkages. If they are worn they produce results just as you describe.

    Had that happen on my kubota.Figured sure the controller would have to be replaced at around $1200. The dealer installed new joystick for $120 and all is fine now.

    Egon

  3. #3
    Elite Member
    Join Date
    Sep 2003
    Posts
    4,144
    Location
    New Brunswick, Canada
    Tractor
    Kubota L5030 HSTC, MF 5455

    Default Re: Jerky Hydraulics

    It sure sounds like cavitation or low on fluid. The loader hose on a tractor of a neighbours that I use broke and leaked out a few gallons before we caught it. The loader was very jerky raising and the power steering was intermittant.

    Ken

  4. #4
    Gold Member
    Join Date
    Sep 2003
    Posts
    303

    Default Re: Jerky Hydraulics

    i think slow is right, check your fluid levels

  5. #5
    Silver Member
    Join Date
    Jul 2003
    Posts
    125
    Location
    Jewel Lake, ID

    Default Re: Jerky Hydraulics

    I fogot to mention that I had checked the fluid level, that is fine. As I type this, I'm draining the fluid, I want to check and see if there is a strainer on the inlet.

    BTW, I found the pump, I hadn't realized that the spin-on filter was on the suction side of the pump.

    Thanks for the input, I'll let you know what I find.
    Bri

  6. #6
    Super Star Member
    Join Date
    Apr 2001
    Posts
    11,306
    Location
    PA
    Tractor
    NH TC25D

    Default Re: Jerky Hydraulics

    Visit this thread for the rest of the story.

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