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Trans Fluid Type

Discussion in 'Engines and Propulsion' started by rpell1@msn.com, Jan 18, 2019. Add this thread to a FAQ

  1. rpell1@msn.com

    rpell1@msn.com

    Joined Sep 25, 2008
    362 posts, 14 likes
    Catalina 30 MKIII
    US Varuna Boat Club
    Hi everyone. I have a '97 Catalina MKIII with a Universal M25xpA. I noticed my transmission fluid was just a little bit low. Since I am not the original owner, I have no idea if the fluid was or was not changed and therefore, I am not sure of what fluid is in there.
    What I want to find out is, can I top off the fluid with any of the recommended fluid types or must I drain it and re-fill?
    Since my time is limited to all of the other little must do items I found after I bought the boat, I am hoping I can just safely add fluid.
    Your opinions please.....
    Thank you,
    Ralph
     


  2. Stu Jackson

    Stu Jackson

    Joined Feb 26, 2004
    20,258 posts, 780 likes
    Catalina 34
    224 CA Maple Bay, BC, Canada


  3. Gunni

    Gunni

    Joined Mar 16, 2010
    5,768 posts, 1,399 likes
    Beneteau 411 Oceanis
    US Annapolis
    Not knowing what someone may have put in there before, I would extract the transmission oil and replace it. Believe all those Hurth transmissions use Dextron III ATF. Do it every year.
     


    FastOlson and Tom J like this.
  4. Ron20324

    Ron20324

    Joined Jan 22, 2008
    6,707 posts, 798 likes
    Beneteau 323
    US Annapolis MD
    Do it ALL, then enter the date and what you used into your log book.
     


  5. Tom J

    Tom J

    Joined Sep 30, 2008
    1,290 posts, 209 likes
    Catalina 310
    US Quincy, MA
    What Gunnie said, for sure. Not sure what Hurth is using for fluid nowadays, but it is clear, not red. I'm sticking with the Dextron III ATF.
     


  6. Stu Jackson

    Stu Jackson

    Joined Feb 26, 2004
    20,258 posts, 780 likes
    Catalina 34
    224 CA Maple Bay, BC, Canada
    Which is red. I have some. Has been for years. In the links I sent earlier.
     


  7. Ron20324

    Ron20324

    Joined Jan 22, 2008
    6,707 posts, 798 likes
    Beneteau 323
    US Annapolis MD
    My Benny w 3ym 20 uses 30 weight motor oil, as per the label on the tranny.
     


  8. Tom J

    Tom J

    Joined Sep 30, 2008
    1,290 posts, 209 likes
    Catalina 310
    US Quincy, MA
    That's the point I was trying to make, Stu. Hurths have used ATF fluid for years. ATF is red. But the newest Hurth I have looked at has clear fluid. The tranny was defective, new from the dealer. It replaced a Hurth tranny that had the same issue. The owner is now on his third new Hurth tranny in as many years. Hurth was not forthcoming about what the defect was, or what the clear fluid is.
     


  9. Mark Maulden

    Mark Maulden

    Joined Jan 25, 2011
    1,801 posts, 181 likes
    S2 11.0A
    US Anacortes, WA
    You have several options:
    1) drain it and refill with known correct oil from manual
    2) if you have PO logs they might state was was previously used. If correct, just top off.
    3) have a sample analyzed and go from there.
    Personally, I would just go with #1. You would know its the right oil, its new oil, and can be logged as such.
     


  10. DayDreamer41

    DayDreamer41

    Joined Oct 29, 2016
    1,167 posts, 560 likes
    Hunter 41 DS
    Un Port Huron


    Last edited: Jan 21, 2019
    Tom J likes this.
  11. NYSail

    NYSail

    Joined Jan 6, 2006
    1,934 posts, 147 likes
    Beneteau 423
    US Mt. Sinai, NY
    I’m a 30 weight and believe in changing every year...... too simple to put off. I would pump out and add new....... 1/2 hour tops but I guess that depends on access (I’m spoiled)

    Good luck!
     


  12. LeslieTroyer

    LeslieTroyer

    Joined May 20, 2016
    2,234 posts, 943 likes
    Catalina 36 MK1
    US Everett, WA
    I change mine every time I change oil. 1/3 quart easy cheap. No way I want to rebuild/replace the trans.
     


    Gunni likes this.
  13. Terry Cox

    Terry Cox

    Joined Dec 25, 2000
    3,570 posts, 467 likes
    Hunter Passage 42
    US Shelter Bay, WA
    The bell housing on our boat has a plate that states ATF for our Kanzaki, so that is what I use.
     


  14. Tally Ho

    Tally Ho

    Joined Jan 7, 2011
    1,198 posts, 214 likes
    Oday 322
    US East Chicago, IN
    My Kanzaki KM2P says 20 or 30 weight oil.

    2C794819-D6F4-45DD-B799-0BF3ADEAE273.jpeg

    Greg
     


  15. Maine Sail

    Maine Sail Moderator

    Joined Feb 6, 1998
    10,824 posts, 633 likes
    Canadian Sailcraft 36T
    US Casco Bay, ME
    Yanmar uses two gear boxes one built by Hurth with a round Kanzaki/Hurth emblem and one made by Kanzaki with a Kanzaki emblem. The Hurth made "Kanzaki" gear usesATF the Kanzaki uses 30 weight...

    Hurth built Kanzaki's often have "BW" in the model as in KBW. The regular Hurth would be an HBW..

    The OP's Universal diesel with a Hurth gear uses ATF III...
     


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