Hydraulic swim platforms?

Discussion in 'General Discussion' started by Z-Worthy, Jan 21, 2018.

  1. FootballFan

    FootballFan Well-Known Member GOLD Sponsor

    Jun 20, 2012
    Marquis 59
    MTU Series 60
    Didn't mean to infer that they did not work well in salt water.

    On my second boat with a swim platform in saltwater. I didn't shy away from it. When we were looking at our initial requirements our preference was to have the tender on the fly bridge level.

    The boat we wound up purchasing was a compromise of initial requirements. We fell in love with the layout - it meant a hydraulic swim platform.

    Just like anything else on a boat, when you are dipping components into salt water on a regular basis - be ready for maintenance. In fact, its not just dipping, just being exposed to the salt in the air.

    Happy with the one we have.

  2. carterchapman

    carterchapman Well-Known Member TECHNICAL Contributor SILVER Sponsor

    Mar 25, 2008
    Lake Chickamauga/Marietta, GA/Ft. Myers, FL
    2006 Sea Ray 58 DB
    MAN CRM V8-900s, Twin Disc Drives; Onan 21.5 Generator
    Same as you Mark...
  3. Blkbird

    Blkbird Member

    Jul 5, 2010
    Lake Lanier, GA
    1997 Sea Ray 450 Sundancer
    Twin 3126 CATS
    Has anyone installed a hydraulic platform on a 90's boat? If so, what work was done to reinforce the transome?
  4. fwebster

    fwebster Well-Known Member TECHNICAL Contributor PLATINUM Sponsor

    Oct 6, 2006
    Middle Tennessee ; Panama City Beach, FL
    1996 450DA
    3116 Caterpillars
    Some mid-90's hulls were constructed to handle the weight and stress of a hydraulic platform, some were not. Due to the height and distance between the stringers on the 450DA, I suspect the structure is strong enough, but that is nothing but my opinion. To get a definitive answer, you should talk to the Sea Ray Customer Service guys at Palm Coast, but before you call them, do your research and be in a position to tell them how much the hydraulic arms, the new platform if you are changing swim platforms and the load you plan to haul round on the platform weigh.

    If you do need to add some support structure, it is usually just some knees glassed to the top of the stringers and to the transom.
  5. Blkbird

    Blkbird Member

    Jul 5, 2010
    Lake Lanier, GA
    1997 Sea Ray 450 Sundancer
    Twin 3126 CATS
    Frank - sorry but "knees" refers to what?
  6. PlayDate

    PlayDate Well-Known Member SILVER Sponsor

    Dec 25, 2006
    Washington DC
    1994 370 Express Cruiser
    454 Mercruisers
    Sometimes a picture is easier to explain....the angled wood rising on the right from the stringer to the transom (far right) is known as a knee. The other way I have seen it done is to tie the backing plate of the lift to the stringer with a stainless steel brace using a 35-45 degree angle.
    Last edited: Jan 24, 2018
  7. Richard C

    Richard C New Member

    Feb 16, 2015
    Montreal, QC, Canada
    2000 410DA ''Endless Summer'' / Hydraulic Platform lift with stern & bow thrusters / Seaescape 9'
    Twin 3116 Caterpillar / V-drive / Westerbeke 7.6 / Parsun 5HP
    We have a Sundancer 410 (year 2000) equipped with a QHS hydraulic swim platform (factory installed) and never had any issues besides replacing the two selenoids.

    We are now considering replacing the dinghy for a PWC. What is the weight capacity? Someone mentionned 850 lbs...The BRP Spark is 450 lbs or the GTI is 640 lbs, we like the GTI but it seem heavier. What are your thoughts?
  8. PlayDate

    PlayDate Well-Known Member SILVER Sponsor

    Dec 25, 2006
    Washington DC
    1994 370 Express Cruiser
    454 Mercruisers
    I would give Sea Ray a call and ask them. It's not just the PWC it is the aft weight and sea motion that would put the load on the transom. Typically these lifts can lift more than the transom is rated for.
  9. dcpringle

    dcpringle Member

    Dec 13, 2012
    CT River
    2000 Sea Ray 480DB "Diamond Girl"
    Cat 3196 660HP
    +1 give them a call completely right and you don't want to find out the hard way
  10. Great Lakes

    Great Lakes Member SILVER Sponsor

    Oct 11, 2016
    MacRay Harbor (Michigan)
    2005 390 Sundancer, GHS Swim Platform, Bow/Stern Thrusters, Tracvision, Twin E120 w/ Autopilot
    8.1 High Output
    No problem with our GHS in fresh water. One thing you may consider though. GHS lifts have a swim ladder very similar to a SR one and SeaLift's do not
  11. Carbo

    Carbo Member

    Nov 15, 2011
    2014 48Cantius
    Volvo Penta D6 IPS
    One critical buying decision should be ability to get on and off the platform when it is extended. I have a GHS and it pulls away from the boat when lowered. I installed extra grab handles to make boarding safer. I think TNT lifts go straight down. Given different transom designs manufacturer's design may be critical in this regard. I would also point out that many new platforms have integral steps built into them, making it much easier to get back on the boat without having to raise the platform.
  12. LG111

    LG111 Member

    Jan 4, 2015
    Our 2001 dancer with SeaLift is rated 750lbs based on length of boat and performance 8.1s... It will lift 1200lbs but performance would be diminished.

    Our dingy with 25hp tohutsu efi weights appox 400lbs. Barely even notice it while underway. Just slightly more trim... We considered the spark seadoo as a fun toy and I am confident there would be zero issues lifting or changing any performance concerns with our 410.

    PS I have not even noticed any fuel consumption changes or rpm speed differences with or without the dingy on the platform. The 410 is solid!
  13. Russ Calasant

    Russ Calasant Active Member GOLD Sponsor

    Dec 9, 2009
    East Greenwich, RI
    2001 480 DB
    CAT 3196
    Did you by chance record the seals you ordered?
  14. PlayDate

    PlayDate Well-Known Member SILVER Sponsor

    Dec 25, 2006
    Washington DC
    1994 370 Express Cruiser
    454 Mercruisers
    This is what I ordered from Fastliftparts.com

    I used the ones I removed as a reference and matched them up using a caliper to measure the the inside diameter, outside diameter, thickness and profile. TNT used different seal kits on various models. Alternatively.....if you have a hydraulic supply nearby you can get the parts you need directly from them. It is a very straightforward job. The only thing that was difficult was installing the new piston seals. The replacements were a much stronger material. I had to boil the seals suspended in water to make them pliable and it was still a finger buster.

    Four DPU25-1.50-37 / DPU PISTON U-SEALS
    Two ST-75 / RW-95URE-0.750X1.125X0.188
    Two U12-0.75-18B / US-90URE-3/4X1X3/16

    Total: $32.08
  15. villain style

    villain style Active Member SILVER Sponsor

    Oct 10, 2006
    Mears Point Marina Kent Island, MD
    2006 340 Sundancer
    Merc 8.1L's V-Drives
    Looks awesome. Ready to sell?
  16. Escapade

    Escapade Member

    Jan 10, 2007
    Lake Michigan
    390 Sundancer 2005
    Twin 8.1's
    Great Lakes-
    Can you share who mounted your lift and approximately the lift and mounting costs?

Share This Page

Show Sidebar