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  1. #1

    Join Date
    Aug 2009
    Location
    Polson Montana
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    Question Hello All, I am the new proud owner of an SLT 780.

    I purchased the ski from a local dealer. It was in excellent condition considering the age, 96'. I ran perfect for a couple of weeks. then my son sucked a rock up in the impeller. I was able to extract it myself. I didn't look to have cause much damage to the impeller itself. No chips in the leading edges or anything. I put everything back together and took it out the next day.

    After a few rides out it started to cavitate at lowend startups. I then proceeded to pull the assembly out again. I look for anything that could cause the cavitation. I noticed that the o-ring that sealed the pump base to the mount had slipped out a little/ Enough that I could stick my finger under it. I tried to push it back in. Even loosening the mounting bolts. But the base is too well sealed. I couldn't get it back in. I believe it came out because I didn't torque the bolts down tight enough. I don't know.

    What I am asking is how do I remove the base enough to reposition the o-ring? Is it something I should try? What tool do I use? Or do I have a shop do it? What should it cost? Is it really what is causing the cavitation/ventalation? I didn't notice before I took the rock out. Just after the cavitation started.

    Thanks ahead for the input.

    Swasster from Beautiful Polson, MT


  2. #2
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Welcome to the Hulk Swasster.

    Are you referring to part #15?



    or something in this diagram?





    Did you remove the entire jet pump from the hull? I'm guessing you did.

    If so, I hope you didn't remove the studs from the hull, but just the nuts that held the wear ring (#35 in the second pic) to the hull.

    If you removed the studs from the hull, you may need to re-align the pump to the engine. If you removed just the nuts from the exterior of the hull, you should be OK.

    The O ring should seat inside the pump shoe. (#14 in the first pic) It almost positions itself, unless something is wrong.

    No special tools, just remove the 4 nuts on the exterior of the hull, grease the O ring and re-install it into the pump shoe. Then reinstall the wear ring and torque the nuts to spec. The rest of the pump will bolt to the wear ring.

    Do it yourself, it's very easy to do, and will save you some $$$.

    If the O ring isn't sealing, of course that can cause your cavatation issue.

    Also if the rock damaged the stator vanes, that'll cause a big performance loss as well. It's not hard to crack the aluminum vanes. The stainless steel stators are much better for this reason, as well as, more efficient.

  3. #3
    Click avatar for tech links/info, donation request K447's Avatar
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    Welcome

  4. #4
    Moderator RX951's Avatar
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    welcome to the forum

  5. #5

    Join Date
    Aug 2009
    Location
    Polson Montana
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    Yes it is part #15 that is the problem.

    Here is a drawing of what it looks like.



    I haven't removed the Shoe. I just tried to remove the Wear Ring but wasn't able to budge it. I just need to know what is the best way to remove it without damaging any parts.

    Thanks

    Steven

  6. #6
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Did you disconnect the hoses inside the hull?

    After the 4 exterior nuts, and the hoses on the inside, it should come off.

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