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  1. #1
    Member
    Join Date
    Feb 2005
    Posts
    32
    Location
    Port St. Lucie, Florida
    Tractor
    Kubota B7100HST Diesel 4x4

    Default Hydrostatic Transmission help

    I just purchased a kubota B7100 hst 4x4 diesel. I t only moves in low gear but not powerful enough to climb a trailer. I just changed both filters on the side of the trans and the one on the top, refilled with kubota udt fluid, and it still doesn't move in high and does do a little better in low, but not much. Do you have to bleed out air after refill, if so, where at? Any help would be appreciated, thanks.

  2. #2
    Gold Member
    Join Date
    Sep 2004
    Posts
    267
    Location
    North Texas (40 Miles South of OK)
    Tractor
    Kubota L4330 HST

    Default Re: Hydrostatic Transmission help

    Just a thought but how is the fuel filter? you might try cleaning that .

  3. #3
    Super Member JerryG's Avatar
    Join Date
    Apr 2000
    Posts
    7,186
    Location
    Northwest Arkansas
    Tractor
    MF 1440-4 PowerShuttle

    Default Re: Hydrostatic Transmission help

    You didn't say if this was your first hst tractor or not. If it is, when you push the pedal down it is like going to a higher gear. If you let it up some, it is like down gearing. It is not an accelerator pedal. Sorry if you knew this already, there has been several that didn't in the past.

  4. #4

    Default Re: Hydrostatic Transmission help

    Fireman,

    When you change the fluid and filters, you should let the tractor idle for about 15 minutes before you try to move the tractor. I can't remember what the manual for my B7100 says, but I think that it is about 15 minutes. This purges the air from the system. Once you have done that, check the fluid level and top off as necessar.

    Best of Luck. the little B7100 is a tough little tractor.

  5. #5
    Super Member Henro's Avatar
    Join Date
    Jul 2003
    Posts
    5,294
    Location
    Few miles north of Pgh, PA
    Tractor
    Kubota B2910, BX2200, Yardman 20HP pos...

    Default Re: Hydrostatic Transmission help

    Fireman,

    Holzster's point about the fuel filter is a good one.

    What is the engine doing when you are having trouble moving? Do you lose any RPMs?

    I had a problem with my fuel filter where sometimes the tractor would have power and other times it would lose power so bad I had to stop and let the engine pick up RPM again (HST kubota B2910). It turned out to be the fuel filter being clogged up.

    The key seemed in my case to be lack of fuel, which led to lack of power, causing a drop of engine RPM and loss of ability to move/do work.

    If your engine is running strong and the tractor is not moving, it's probably not a fuel supply issue.

    Are you able to coast the tractor on a slope? Chucko's comment [edit: Now where did I see that comment??? Must be another similar thread around... [img]/forums/images/graemlins/confused.gif[/img] [img]/forums/images/graemlins/blush.gif[/img]] about the brake is interesting. You probably don't have the brake set, but did the tractor sit a long time before you bought it? I don't know if brakes can freeze like clutches can over time...just a thought...

  6. #6
    Member
    Join Date
    Feb 2005
    Posts
    32
    Location
    Port St. Lucie, Florida
    Tractor
    Kubota B7100HST Diesel 4x4

    Default Re: Hydrostatic Transmission help

    I just changed the fuel filter as I was changing the hydro fluid. Ther brake is not set. I understand how a hst works, but the problem is it does not move at all in high gear, it acts like it's trying, but won't move. In low gear, it will move fine on level ground, but if you try to go up a hill or dig into a pile , as soon as it hits resistance it just stops were it is.

  7. #7
    Super Member JerryG's Avatar
    Join Date
    Apr 2000
    Posts
    7,186
    Location
    Northwest Arkansas
    Tractor
    MF 1440-4 PowerShuttle

    Default Re: Hydrostatic Transmission help

    It is likely air in the fuel system. Some one familiar with your model can tell you how to bled it.

  8. #8

    Join Date
    Dec 2004
    Posts
    61
    Location
    Minnesota

    Default Re: Hydrostatic Transmission help

    I'd suspect the relief valve for the hydro is bad. I don't have a clue where it is on that tractor. Good Luck,

  9. #9
    Super Member _RaT_'s Avatar
    Join Date
    Apr 2000
    Posts
    5,814
    Location
    Northern CA.
    Tractor
    Push mower, Snapper 21" 6 shovels, 2 rakes, a pick, 2 pinch bars, a post hole digger (two handle type) and 2 wheel barrows that handle like a Porsche.

    Default Re: Hydrostatic Transmission help

    Go to Tractor Smart and see about downloading the parts manual, it's free, you may need their assitance. It can help identify any part(s) you might need and you can order them there. Ask for some advice as well, they are great!

  10. #10
    Bronze Member
    Join Date
    Jul 2003
    Posts
    84

    Default Re: Hydrostatic Transmission help

    Was it working before you changed the oil and filters? How many hours are on the tractor? did you buy from a dealer?Check the HST linkage, Then check the pressures on the HST.

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