Hydro question

Discussion in 'Mechanic and Repair' started by Scotts' Yard Care, Sep 15, 2005.

  1. Scotts' Yard Care

    Scotts' Yard Care LawnSite Senior Member
    Messages: 343

    How many lifetime hours are the popular commercial pumps and wheel motors rated for? Parker Ross, Hydro gear etc.....
  2. Roger

    Roger LawnSite Fanatic
    Messages: 5,943

    I don't know the service hour rating on my pumps and motors. I have a 36" Exmark Viking hydro, with at least 6,000 service hours, maybe close to 7,000. The pumps and motors have never been touched.

    In the past year, one of them occasionally does not respond back to neutral quick as quickly as it should when cold. But, it happens only once or twice, and is not a problem. I was told by Exmark that "churning valves" sometimes wear a bit, causing this behavior.

    Having said all this, I believe I'm on borrowed time with the units. I've changed fluid (Mobil 1, 15W50) and filter after each season (eight of them so far), and the tank never needs a topping off between changes. I consider the pumps and the motors to be the most vulnerable part of a machine that has given excellent service over the years of heavy use.
  3. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    I don't remember seeing anything on hour rating, But I can say I have never had to replace or repair any in my 14yrs.
    Only two hydro-gear transaxles out of lawn tractors within the first couple weeks form a factory defect. If maintained properly they should out last the unit their on from what I've seen.
  4. MBDiagMan

    MBDiagMan LawnSite Senior Member
    Messages: 852

    I don't think that there is such a published spec as hour rating. If maintained properly, however, they should not wear out in the course of the life of the mower. I doubt that many people run mowers past 7,000 or 8,000 hours and they should certainly be good for that many hours.

    Since you did not indicate why you are curious about this, it's difficult to respond further.

    Good luck,
  5. ed2hess

    ed2hess LawnSite Fanatic
    Messages: 14,567

    I had to replace a drive motor on Scag 36" hydro after about 2500 hours. The bearing failed and I didnt' catch it quick enough to avoid damaging the spindle so I had to get new part. I attribute most of the bearing damage to going up over curbs, that is really tough regardless of how careful you are. I had to put a new hydro drive motor in a used Walker that had less than 1000 hours on it.
  6. Scotts' Yard Care

    Scotts' Yard Care LawnSite Senior Member
    Messages: 343

    I appreciate the replies :) I've looked around the net some and couldn't find too much in the way of life expectancy on these systems. I was very surprised to hear that the lawn tractor hydros are so long lived since I understood these were comparatively inexpensive homeowner types. Is this correct? Someone said, in another thread. that the ezt hydro homeowner models were good for 800 hrs. or so. Does anyone know of a site with exploded views of various hydro systems like the pumps and wheel motors or
    the unit hydro systems? I'm a gear head so this stuff fascinates me :D
  7. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    If your a hydro junkie maybe this site will interest you.
  8. Scotts' Yard Care

    Scotts' Yard Care LawnSite Senior Member
    Messages: 343

    Thanks very much for the link and it sure does interest me :D Going to be some fun reading.
  9. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    Happy Reading :cool:
    Take Care

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