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  1. #1
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    Single trim ram / cylinder differences

    Hi, I have two midsections. One has a trim cylinder of a 260. The other has a cylinder of a 280. The 280 cylinder is a bit thicker and more beefier.

    I discovered that the mid with the 260 has more negative trim. The cylinder of the 260 can retract more.

    Is anyone familiar with this? Is it normal or is the 280 cylinder not assembled right? (I have no idea whether it has been taken apart yet in the past).

    I realy need the extra negative trim the 260 cyl has.

    Thanks for your input

    Regards
    http://www.geocities.com/fletcher_arrowbeau

    Fletcher 17F6
    Hydrostream HST 20F

  2. #2
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    Wouldn’t just putting a 2.5 or 5 degree wedge in be easier than swapping rams around??

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  4. #3
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    The piston travel is the same for both early and late model cylinders . That's not what stops negative travel . The notch cut into the lower guide arms bottoms out against the landing pads on the exterior of the cylinder.
    If you want more tuck under , you can machine/ sand the pads .
    And then machine the rams internal parts to match.
    Don't get carried away .. cuz if the weld holding the top loop touch's the closure cap ... it will be a leaker for sure .

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  6. #4
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    Hi Chaz, i had to reread your post to get it but it's clear now.

    The fact is that the part that has the vertical steering pin going through is not touching the ram. I can put my finger in between.

    It seems like the piston cannot fully retract although you can feel it is bottomed out.

    You say the piston travel is the same for both styles but is the starting point, fully retracted mode, the same too?

    If this is the case something must be wrong with cylinder.

    Thanks!
    http://www.geocities.com/fletcher_arrowbeau

    Fletcher 17F6
    Hydrostream HST 20F

  7. #5
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    This should clear it up ....

    These external pads are the retracting stops ---->



    When they make contact here --->



    That's it . End of the road . If the hydraulic parts inside were used as the stops . It wouldn't take long to ruin the cylinder.
    Yes you are correct ... fully compressed, there is aprox. 13 to 15 mm between the body and the base of the loop , that is normal (this one is not .. rusted out) -->





    More better ...




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  9. #6
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    Thanks. Very clear. I will dissamble the cylinder.
    http://www.geocities.com/fletcher_arrowbeau

    Fletcher 17F6
    Hydrostream HST 20F

  10. #7
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    I opened up the ram. A spring seat is gone. Found it broken in the bottom of the cylinder. Mercury does not list these seperately?

    I guess the part with the springs in it spun loose and is the cause the trim ram did not fully retract.




    Click image for larger version. 

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    http://www.geocities.com/fletcher_arrowbeau

    Fletcher 17F6
    Hydrostream HST 20F

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  12. #8
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    Your center bolt has loosened up . When seated , the spring guide's three prongs fit inside a little step machined into the bypass block.

    I have one here now that someone tightened the assembly without aligning the three tabs and crushed the guides .

    You are correct , they are not sold separately ...

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  14. #9
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    Yes, one guide has a folded / crushed lip...

    Are they realy necessary?
    http://www.geocities.com/fletcher_arrowbeau

    Fletcher 17F6
    Hydrostream HST 20F

  15. #10
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    Quote Originally Posted by bigboy View Post
    Yes, one guide has a folded / crushed lip...

    Are they realy necessary?
    I have never built one without the guides. I guess it you tighten the bolt and can't pry one out with a screwdriver ..... you might be OK ..

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