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Hydro-Gear rebuild

  1. #1
    Lifer Stromper's Avatar
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    Hydro-Gear rebuild


    Residential Crapstman Zero Turn

    Left side very tired , right side beginning symptoms

    Any you guys rebuild the hydro gear transmission, The kit aint cheap like $150 so in the $300's
    for both sides

    Certainly better than the 3K for a new on, I have an acre of grass so need something
    that really cuts grass, and i have been satisfied

    Comments or suggestions

    rich

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    The calculus of hate

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  2. #2
    Don't bother me! R7's Avatar
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    Re: Hydro-Gear rebuild

    Call orange Donny, maybe he can Make Your Mower Great Again.

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  3. #3
    Lifer loudbeard's Avatar
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    Re: Hydro-Gear rebuild

    Too much Zoolander with this mower it seems.

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    I went to MMI I know what Im doing here chief

  4. #4
    Lifer Falko's Avatar
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    Re: Hydro-Gear rebuild

    Quote Originally Posted by Stromper View Post
    Residential Crapstman Zero Turn

    Left side very tired , right side beginning symptoms

    Any you guys rebuild the hydro gear transmission, The kit aint cheap like $150 so in the $300's
    for both sides

    Certainly better than the 3K for a new on, I have an acre of grass so need something
    that really cuts grass, and i have been satisfied

    Comments or suggestions

    rich
    There's not a lot to them, but you may need specialty tools.

    Are you sure the main pump isn't starting to fail as well? When those go it will bring out any weakness in the hydro motors.

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    Dad's Dream: Earn enough money to live the life that his wife and kids do.

  5. #5
    Dictionary quoting knob stoinkythepig's Avatar
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    Re: Hydro-Gear rebuild

    I did fix one once, it had broken piston return springs in the variable volume pump. They are not very complicated, it's just two rotary piston pumps, some valves, and some reduction gearing.The pump that connects to the wheels has fixed volume (the swash plate angle does not change) and the one that connects to the engine has variable volume and direction that can operate from +100% to -100% (thus it can manage the volume and direction of the oil flow by altering the angle of the swash plate). The direction of the oil flowing from the variable pump to the fixed pump determines the direction the wheel turns. The volume of that oil determines the speed of the wheel. My advice is to open it up and see what broke before you buy the rebuild kit. The kits don't typically include parts for the pumps, they are mostly seals gaskets and valves.

    If you like the elegance and simplicity of a revolver firearm, you will appreciate the rotary piston pumps. They look like the cylinder on a giant six gun.

    Anything you can do to keep the transmission cool is a good thing, they can get quite hot when under heavy use and the cooling fan is adequate at best on hot days when the housing is clean and free of air-blocking debris. Any air-blocking crud is bad on those.

    Edited to add: If your machine has one main pump to drive two transmissions, my take above on the design is probably completely wrong, but it would still be a simple device to open up and inspect.

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    Last edited by stoinkythepig; 03-25-20 at 08:11 AM.

  6. #6
    Lifer Stromper's Avatar
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    Re: Hydro-Gear rebuild

    Looking at the video it appears that the end of the pistons bear on an aluminum plate
    Not surprising the Aluminum gets a groove and then piston travel is reduced
    She's about 7 years old so thats like 250 hours of operation, a replacement would be at least 3K

    I 1st need to replace an axle on my Sienna then I will break this open and look after calling
    calling hydro-gear are they shipping parts?

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    The calculus of hate

    It is not that I should win it is that you should lose
    It is not that I succeed it is that you fail
    It is not that I should live it is that you should die

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