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Eaton 751...help!

Discussion in 'Mechanic and Repair' started by FerrisDJB, Oct 25, 2001.

  1. FerrisDJB

    FerrisDJB LawnSite Member
    Messages: 42

    I need info on how to drain and fill this hydro unit. I have gone to Eaton's web site and down loaded the schematic. I have read it backwards and forwards but no where do they mention how to drain and refill this drive pump. This pump has no filter and is used on Ferris SD36" and SD48"s. I talked to my Ferris dealer and without blasting them.........I'ld rather ruin these units myself than to pay some one to do it for me!! Any help would greatly be appreciated. Thank you!
  2. Richard Martin

    Richard Martin LawnSite Fanatic
    Messages: 14,699

    Actually what you have there is not a pump, it is a transaxle. It does have an internal oil filter. I highly recommend getting a factory service manual before any repairs or maintenance work is done. Replacement costs are close to $1000.00 on these units.
  3. captdevo

    captdevo LawnSite Senior Member
    Messages: 932

    here you are.....

    Changing Hydrostatic Transmission Fluid

    The hydrostatic fluid should be changed every 1000
    hours or two (2) years. Also, the fluid should be
    changed if the natural color of the fluid has become
    black or milky (indicating possible overheating or
    water contamination of fluid). The transmission may
    be refilled using any of the fluids listed in
    Specifications. The fluid is changed as follows:
    1. Park the mower on a level surface and stop the
    2. Remove the lower drain plug and the air bleed
    plug. Allow the fluid to drain out.

    IMPORTANT: Clean any dirt from around the
    plugs and reservoir cap before removing them.

    3. Reinstall the lower drain plug, making sure the
    rubber O-ring on the plug is in place and in
    good condition.
    4. Refill the transmission through the air bleed
    plug hole until it is as full as possible.

    IMPORTANT: Avoid fluid contamination when
    filling the reservoir. Use clean container, spout,
    funnel, etc. when pouring the fluid into the

    5. Rotate the transmission input shaft about five (5)
    revolutions to allow any trapped air to escape.
    6. Before installing the air bleed plug, fill the
    with fluid allowing a small amount to leak
    out of the air bleed plug hole.
    7. Install the air bleed plug and fill the reservoir
    the COLD level line.

  4. Gary LA

    Gary LA LawnSite Member
    from B.S.Mo.
    Messages: 40

    captdevo knows whats up.
    It was real fun for me trying to finagle a way to get that fluid threw that little bitty hole.
    I bought the power brake bleeder with the hand pump?,
    Its slow but darn near necessary.
  5. md62014

    md62014 LawnSite Member
    Messages: 1

    i just loosen the small plate where the internal filter is and let it drain there.

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