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  1. #1
    New Member
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    2001 New Holland TC29D

    Default Hydrostatic transmission problems

    Was mowing in high weeds today and tractor seemed to just pop out of gear. It is a hydrostatic transmission....everything else seems fine but it won't go anywhere.....anybody got any suggestions also noticed that rear pto is not engaging
    Last edited by jdance49; 10-19-2010 at 06:33 PM.

  2. #2
    Veteran Member Hooked_on_HP's Avatar
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    Coal City IL
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    Ford 1900 FWD Kubota F2100E

    Default Re: Hydrostatic transmission problems

    It is a hard question to answer when you dont tell what tractor you have.
    Bill

  3. #3
    Super Member texasjohn's Avatar
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    Central Texas, Jarrell
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    Kubota 5030HSTC

    Default Re: Hydrostatic transmission problems

    Wild guess.... check linkages between HST pedal to transmission ...... is it flopping loose, leaving it in the center, no motion, position?
    Joy is having the tools you need and needing the tools you have!

    Kubota 5030 HSTC, BB, Danueser PHD, LA853 QA HD FEL w JD toothbar, 3pt chisel, 3 pt disk, 6' shredder, Kubota FEL hay spike, 3pt hay fork w carryall, Kubota RTV 1140

  4. #4
    New Member
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    2001 New Holland TC29D

    Default Re: Hydrostatic transmission problems

    Quote Originally Posted by Hooked_on_HP View Post
    It is a hard question to answer when you dont tell what tractor you have.
    Bill
    It is a New Holland TC29D....The rear pto doesn't engage either. It like it just slipped out of gear as I as mowing....I have tried to put it in all three speeds but still nothing.....all linkages are tight underneath the hydrostatic foot pedal

  5. #5
    New Member
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    2001 New Holland TC29D

    Default Re: Hydrostatic transmission problems

    Quote Originally Posted by texasjohn View Post
    Wild guess.... check linkages between HST pedal to transmission ...... is it flopping loose, leaving it in the center, no motion, position?
    Have checked them all....they are tight....It seemed like while I was mowing it just popped out of gear.....

  6. #6
    Epic Contributor jinman's Avatar
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    Texas - Wise County - Sunset
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    NHTC45D, NH LB75B, Ford Jubilee

    Default Re: Hydrostatic transmission problems

    I looked at the parts diagrams for your tractor, but there is not one overall view that shows where a common part might fail and cause your problem. I'm thinking that something simple like a splined collar between two shafts has let go or slipped out of position. I'm just not sure how the PTO driveline goes through or by the HST on your tractor. I can't get my mind around all the parts diagrams enough to figure that out. It is possible that your clutch has let go, but you would surely have heard something rather than just a sudden loss of all gears and PTO. The unfortunate thing about all this is no matter how simple the fix, you will have to split the tractor to find/fix the problem. I just don't expect this to be a simple problem that can be addressed externally.
    Jim


  7. #7
    Elite Member JC-jetro's Avatar
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    Kansas
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    Ford 1700, Kubota MX-4700

    Default Re: Hydrostatic transmission problems

    Have no experience with HST transmission. Is your PTO engaged hydraulically? can you measure or inspect HST pump pressure? do you know if you have flow to your Hyd motor?

    JC,


    Edit:

    I went to NH site and briefly looked at the mechanism. It looks to me the Pto final shaft is directly coupled to transmission input shaft going thru the HST pump/motor assembly. In other words if the engine is on and clutch out the PTO input shaft should be turning anytime the engine is on. The coupling between pto final output shaft and the pto input shaft is done by a sliding coupler. If I'm correct then with the engine off, I'd engage the pto without any implement attached to it and then turn the engine on. when I let go of the clutch the pto should be turning even if I have HST pump/motor issue. I'm thinking you might have an issue with the main clutch not turning the hst input shaft.

    Rick will be here soon to sort it out.
    Last edited by JC-jetro; 10-20-2010 at 10:31 AM.
    Ford 1700, 2wd.
    Kubota MX-4700DT, Gear transmission with LA 884 loader, Q/A and HD bucket.
    60" Woods Rotary Cutter, home made (3-pt boom and a Row Hipper) ,King Kutter( 5 ft Tiller,Middle Buster,Single Row Cultivator,Carry-all, 5 ft blade, 6 ft Landscaping Rake ,30" Dirt Scoop and a 4'x4' Drag Harrow)

  8. #8
    Gold Member
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    near Williamsburg ,Virginia
    Tractor
    TC 35 New Holland and 52 Case VAC,LT25 Woodmizer logmill

    Default Re: Hydrostatic transmission problems

    when you say everything "seems fine." You did check your hydraulic level,right?

  9. #9
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    Default

    Something failed between the flywheel and the HST. Either the clutch disc/splines or HST input shaft.

  10. #10
    Epic Contributor jinman's Avatar
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    Texas - Wise County - Sunset
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    NHTC45D, NH LB75B, Ford Jubilee

    Default Re: Hydrostatic transmission problems

    Quote Originally Posted by Carykong View Post
    when you say everything "seems fine." You did check your hydraulic level,right?
    Cary, on the TC29D, the PTO does not rely on hydraulics like on our tractors. It is always a good idea to check the fluid level for HST function or main hydraulic problems, but on the TC29D, the PTO is mechanical and a mechanical failure is indicated by the symptoms.
    Jim


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