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  1. #1

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    Help with MHZ Counter Rotating Gear Box

    Hello All!!!

    I need a little help. I am in need to split and rebuild the gear box as the bearing seals went south and leaked some gear lube...gears and case are fine but bearing seals are shot...might as well replace with the good stuff while it is split.

    MANY months ago I stumbled across a thread on this on either Jims or RCU and I cannot find it for the life of me. It had the Boca Bearing Part numbers and a real quick How-To on getting it split and put back to gether (pictures and all).

    ANY help here will be GREATLY appreciated!!!!

    Thanks in advance,

    Trey

  2. #2
    Moderator Justaddwata's Avatar
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    RE: Help with MHZ Counter Rotating Gear Box

    Hi Trey,

    Think I know the post your referring to. It was a build of a Jolly Motors cat and believe he rebuilt the gearbox with ceramic bearings. Believe the thread was on Jims. Will see what I can turn up. I could use the part #'s too.

    One of the better gas boat picture sites - http://imageevent.com/justaddwata

  3. #3
    Moderator Justaddwata's Avatar
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    RE: Help with MHZ Counter Rotating Gear Box

    I received the brg's and they look good. There are three different brg's in the gear box. Six for the small gears and six for the big gears. the input and output shaft brg's are sealed. They also supporting Collet's and cables. So I bought the best brg's they had to those three brg's. Before i took it a part i spun the gear box with a high speed die grinder and it had some vibration at high speed. That is why i replaced the brg's. The tolerances on the new ceramic brg's are about the best money can buy. So when I get it back together I'll let yeah know if the vibration is gone. I bet it is, just checking the play in them you can tell alot of difference. More latter.
    Part# 3-smr607c-2rs#3
    6-smr697c-yzz#5
    3-smr607c-ycc#5
    Jims member: TAPruitt post 06-25-2007, 08:53 PM (Page 9)

    One of the better gas boat picture sites - http://imageevent.com/justaddwata

  4. #4

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    RE: Help with MHZ Counter Rotating Gear Box

    No conclusion on the thread. Did he ever get it running

  5. #5
    Moderator Justaddwata's Avatar
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    RE: Help with MHZ Counter Rotating Gear Box

    have not seen her in action anywhere - he is no longer a member there (not by that screen name anyway) so hard to find out.
    One of the better gas boat picture sites - http://imageevent.com/justaddwata

  6. #6

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    RE: Help with MHZ Counter Rotating Gear Box

    YO! Thanks for the info, Matt!

    That is exactly what I needed! I am not sure if he had her running either??? Never saw an update anywhere. I sure hope his son made it through and back in one peice after his gracious service to our wonderful country!

  7. #7

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    RE: Help with MHZ Counter Rotating Gear Box

    Update on the gear box an dbearings:

    I emailed Boca and they were VERY helpful. The original bearing numbers posted above were total $205...Boca helped me chose a diffreent bearing setup that will outperform the ones above AND saved me $50 in the process. Great service. Bearings are "in the mail."

    part numbers and prices listed below:

    6 pieces SMR607C-2YS @ $13.95 each = $83.70 &
    6 pieces SMR697C-2YS @ $11.95 each = $71.70.

    Total = $154.40. Shipping is by UPS and free.


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