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ZF transmission High PSI issue

Discussion in 'Engines' started by Garret Taynai, Aug 14, 2023.

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  1. Garret Taynai, Aug 14, 2023
    #1
    Garret Taynai

    Garret Taynai New Member

    Joined:
    Aug 14, 2023
    Messages:
    1
    Location:
    Ponce Inle, FL
    Hello,
    I am currently diagnosing a transmission high pressure problem. Model ZF BW255P. The boat is a 2000 55' Hatteras sportfish. Engines are 3412E . The transmission normal in gear psi is 240. The port transmission is creeping up to above 420+ and has to be pulled back to reduce pressure. Temperatures are and remain normal. There are mechanical pressure guages that are reading the same to rule out a gauge issue. We changed the oil and inspected the metal filter screen. Both were clean. We have had a diagnosis of a possible bad pressure valve body. Any other input would be appreciated.

    Kindest regards,
    Capt. Garret
  2. Capt Ralph, Aug 14, 2023
    #2
    Capt Ralph

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    13,436
    Location:
    Satsuma, FL
    Pressure regulator is my first swag.
    You may have typed it pressure valve.

    New model number is ZF 2550

    This issue before you serviced the clutch??

    From the user guide;

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    Last edited: Aug 14, 2023