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servicing Hog D1x compared to Apeks DST

Discussion in 'Do It Yourself - DIY' started by reefrat, Jul 22, 2019.

  1. reefrat

    reefrat Manta Ray

    # of Dives:
    Location: Houston Texas and Grand Turk
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    Has anyone familiar with servicing Hog D1 first stages looked the Apeks service manual for the DST (on the "Frogkick" website)?
    I cant find a HOG service manual for a D1 so I am wondering if the Apeks manual can be used instead or if there are significant differences in the parts/procedure/torque settings etc.
     
  2. rsingler

    rsingler Scuba Instructor, Tinkerer in Brass Staff Member ScubaBoard Sponsor

    # of Dives: 500 - 999
    Location: Napa, California
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    IMO, the DST manual will serve you just fine in working the D1. From a service procedure standpoint, the parts differences are insignificant.
    My only disagreement with both that manual and my instruction from HOG, is that I believe the HP chamber should be assembled FIRST (see Scubapro's Mk17 manual). The reason is that you can drop a few drops of water into the hole for the pushrod, and determine immediately whether you have a HP seal, before you add the diaphragm.
     
    couv likes this.
  3. cerich

    cerich ScubaBoard Supporter Staff Member ScubaBoard Supporter

    # of Dives: 5,000 - ∞
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    A few drops of water, sitting with surface tension is unlikely to show you anything but a gross issue and is nowhere near what tank pressure will exert on the seat.
     
    logandzwon likes this.
  4. rsingler

    rsingler Scuba Instructor, Tinkerer in Brass Staff Member ScubaBoard Sponsor

    # of Dives: 500 - 999
    Location: Napa, California
    2,874
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    I was too cryptic in my comment. Sorry!
    What I meant was: assemble the HP side, and then pressurize the half-assembled reg. Your seat is thus exposed to full tank pressure, and ANY bubble thru your few drops of water will disclose a HP sealing issue before you assemble the rest of the reg.
    I've always felt that diaphragm regs should be assembled HP-side first, for this quick test, as described in the SP Mk17 manual.
    20180224_184753.jpg
    A dowel floating on a pressurized half-assembled diaphragm reg with a teaspoon of water in the bowl where the diaphragm sits. As one can quickly see: no leaks!
    To clear for continued assembly, just drop in the pin and the hat, depress, and poof! All the water is gone! (It helps to use less than the full teaspoon I used for this photo, lol! You'll get sprayed otherwise.)
     
    logandzwon, couv and cerich like this.
  5. reefrat

    reefrat Manta Ray

    # of Dives:
    Location: Houston Texas and Grand Turk
    534
    179
    43
    All good, thanks for the comments and useful info.
     

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