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  1. 02-19-2009 02:41 PM #1
    Diamond cutter
    Diamond cutter is offline Registered Member
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    Exclamation Transmission Fluid type ??

    Hi All. Wanted to know if anyone knows what kind of fluid should be used in my 1985 32 ft Hatteras with 3208T 300hp Twin Disc MG 506 1.5-1 Marine transmission. Transmission oil ?? And how often should it be changed??

    Boat is in Marina Del Rey California so it doesnt get to cold!!

    One more thing I forgot is the proper way to check level similar to a car ( Running in neutral)???

    David
    Last edited by Diamond cutter; 02-19-2009 at 06:52 PM.
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  2. 02-19-2009 05:22 PM #2
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    Avenger
    Avenger is online now Senior Member
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    Re: Transmission Fluid type ??

    Those transmissions use SAE-API service class CD engine oil. Either SAE30 or SAE40 oil depending on temperature range.

    Steady state temps:
    Between 150°-185° F use SAE30
    Between 175°-210° F use SAE40

    If your gear oil coolers are seawater cooled you'll probably need the 30 and if they're cooled by the freshwater circuit the SAE40.
    --- The poster formerly known as Scrod ---

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  3. 02-19-2009 05:23 PM #3
    captddis
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    Re: Transmission Fluid type ??

    40# motor oil. Change every 300 to 500 hr.
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  4. 02-19-2009 10:42 PM #4
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    Blaine Thorpe
    Blaine Thorpe is offline Senior Member
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    Re: Transmission Fluid type ??

    I have been using Cat TDTO (Transmission/Drive Train Oil) SAE 30 with good results in my TD 506. Supposed to provide longer clutch life.

    You should check the oil level with the engine at idle speed and the transmission in neutral.

    Blaine
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