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  1. #1

    Join Date
    Feb 2002
    Posts
    133
    Location
    Farmersville, TX
    Tractor
    Kubota B7500DT,June 2000

    Default Gear Box Venting

    Growing up on the farm all of our equipment had vents, usually in the gear box filler plug. Yesterday after using my SE4 rotary cutter I wanted to check the gear box oil before putting it up. When I removed the drain plug I noticed a positive pressure. Was thinking about putting in a vent and wanted others opinions.

  2. #2
    Super Star Member RoyJackson's Avatar
    Join Date
    Nov 2001
    Posts
    18,831
    Location
    Bethel, Vermont
    Tractor
    John Deere 4400 MFWD, Deere 855D UTV, Z920A Zero Turn Mower and assorted implements

    Default Re: Gear Box Venting

    I would look at your manual first...or talk to the dealer.
    I'd be very surprised (not the first time for being surprised!) if your B7500 wasn't already vented. It may just be clogged or obstructed.

  3. #3
    Super Member ronjhall's Avatar
    Join Date
    Apr 2000
    Posts
    7,437
    Location
    SE Michigan, TX when its cold in MI.
    Tractor
    Kubota 2910 HST

    Default Re: Gear Box Venting

    wichiwichi
    Many gearbox manufacturers call for not filling above the inspection hole. This allows for expansion. Check your manual. Make sure gearbox is not overfilled when it is cold.

  4. #4

    Default Re: Gear Box Venting

    <font color=blue>...not filling above the inspection hole. This allows for expansion. Check your manual...</font color=blue>

    I agree with Ron...

    If you fill it to the "rim"... when the gearbox oil gets hot... it will expand and with no space left to go... guess what... some seal has to give... [img]/w3tcompact/icons/frown.gif[/img]


  5. #5

    Default Re: Gear Box Venting

    I forgot to mention... under some circumstances... even using a "vented plug"... it can become clogged like during brush hogging and then the vent is useless... false security...

    Here's a perfect example where "too much" gearbox oil can be very harmful... [img]/w3tcompact/icons/blush.gif[/img]


  6. #6

    Join Date
    Feb 2002
    Posts
    133
    Location
    Farmersville, TX
    Tractor
    Kubota B7500DT,June 2000

    Default Re: Gear Box Venting

    I have been through the manual and gear box is up to required level. The positive pressure (no venting) is causing seepage on the gear box seal.

  7. #7

    Default Re: Gear Box Venting

    <font color=blue>...gear box is up to required level. The positive pressure (no venting) is causing seepage on the gear box seal. ...</font color=blue>

    Is it possible the gearbox was "overfilled" at one point prior to this and now the damage has already been done...?

    Some other extreme cases when the seals don't go first... the gearbox casing cracks... [img]/w3tcompact/icons/crazy.gif[/img]


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