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Change from gear oil to hyd fluid?

Discussion in 'Tractors' started by saktate, Nov 9, 2005.

  1. saktate

    saktate LawnSite Member
    Messages: 57

    My Kubota L305 (30hp) manual shift tractor requires 8 1/2 gallons of 90 wt gear oil for transmission. I've added a FEL and grapple fork to the tractor just last week. Should I switched to hydraulic fluid or is the gear oil ok with these implements?
  2. Jason Rose

    Jason Rose LawnSite Fanatic
    Messages: 5,858

    HUH? What does the tractors transmission have to do with the Hydraulic system??? Two completely seperate components...

    Manual transmissions need what the book says they need in them.
  3. saktate

    saktate LawnSite Member
    Messages: 57

    Implements do not have independent pump. Hyd pump for implements is tapped into trans system. Gear oil seems to be flowing well at this time. Implements working as designed, but not sure what the future holds for the life of the hydraulic pump. I got two different opinions from dealership.
  4. rancherman84

    rancherman84 LawnSite Member
    Messages: 3

    most newer tractors have a combined tranny and hydralic sump.
    the rear end housing holds the fluid and the pumps take what they need.
    as for the extra hydralic components you added,the need hydralic oil,not gear lube.
    gear lube is way to heavy for use in hydralic systems.gear lube pumps hard when its warm letalone when it starts to get cold out.
    sounds like your tractor should have hydralic oil in the sump,not gear lube.
    is it a hydro,or gear drive unit?
  5. saktate

    saktate LawnSite Member
    Messages: 57

    This Kubota is a 1985 model with a gear drive, manual trans. Will the trans suffer if I switch to hyd fluid?
  6. rancherman84

    rancherman84 LawnSite Member
    Messages: 3

    shoudnt as long as you use a high quality hydralic/transmisson oil.
    but i guess i would read my operators manual to be sure which fluid you use.
    it is possible that your tractor has two seperate sumps.
  7. saktate

    saktate LawnSite Member
    Messages: 57

    Just ordered a repair manual and owner's manual..Thanks

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