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Rams not holding under pressure

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  • Rams not holding under pressure

    I have a Volvo Penta DP-SM and the trim doesn't hold when cruising it slowly goes down. I rebuilt both rams and it holds a little better but still slowly goes down. I was thinking about buying new ones but cant find them, there the older model 2004 where both hydraulic lines are at the bottom of the cylinder. Does anyone know what the model number is or where I can get them or have any other suggestions. Thank in advanced.

  • #2
    I rebuilt both rams and it holds a little better
    The rams not holding position can either be leaking ram seals or the trim pump valves. Suggest taking the trim pump apart and looking at it before going for new rams
    94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
    95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
    07 Seadoo GTX
    Merc Adults Only VP Adults Only
    G-Dad always said "First Liar doesn't stand a chance"

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    • #3
      Raise drive, then disconnect lines and cap the lines and plug the cylinder. Then go boating. If the cylinders move, bad piston seals.

      If the cylinders do not move..... Bad cross pilot check in the pump
      Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

      1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

      Past Boats
      1970 Wooster Hellion - Merc 9.8
      2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
      1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

      What’s behind you doesn’t matter.Enzo Ferrari

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      • #4
        Can you rebuild a trim pump? What would I be looking for if I did take it apart?

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        • #5
          Didn't answer right away hoping one with more knowledge would say, but maybe my stiring the pop will cause someone else to come in and confirm or deny

          Think the VP uses the Olydine pump which is same as Merc. Just search for Olydine pump kit, should be easy to find
          94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
          95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
          07 Seadoo GTX
          Merc Adults Only VP Adults Only
          G-Dad always said "First Liar doesn't stand a chance"

          Comment


          • #6
            Originally posted by jbauman102 View Post
            Can you rebuild a trim pump? What would I be looking for if I did take it apart?
            you take it to a hydraulic shop and pay them the $80 to repair it.
            Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

            1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

            Past Boats
            1970 Wooster Hellion - Merc 9.8
            2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
            1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

            What’s behind you doesn’t matter.Enzo Ferrari

            Comment


            • #7
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              I’d be suspecting it’s the ball valves in the pump now.

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