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  1. #1
    BlueFishCrisis's Avatar
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    How to disassemble, clean, rebuild, and reassemble trim motors

    My trim motor was blowing fuses, so I had to remove and inspect. It was from a 95 SL750 originally, so I assume the arrangement of a Fast Trim Version is different.

    Figured I would document it along the way.

    This thread will outline how to disassemble, clean, rebuild, and reassemble trim motors after removal from the ski, with replacement parts for the DC electric motor and oil seal.

    Start by removing the 5 screws securing the black plastic housing cover to the mount plate.

    Click image for larger version. 

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    Next remove the motor leads and ensure the gasket is present and intact.

    Click image for larger version. 

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ID:	335703Click image for larger version. 

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    Next you need to remove the spring clutch on the actuator arm. I used a C clamp to relieve the pressure to make it easy to remove the pin.

    Click image for larger version. 

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Name:	010 C clamp to remove pin.jpg 
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ID:	335706
    Last edited by BlueFishCrisis; 07-17-2014 at 11:05 AM.


  2. #2
    BlueFishCrisis's Avatar
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    Remove the actuator arm and spring.

    Click image for larger version. 

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ID:	335707Click image for larger version. 

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    Next remove the 4 screws holding the gearbox to the mount plate. Note that these 4 screws along with the output shaft present an opportunity for the trim motor to leak as they are submerged when floating or at idle. The screws I removed appeared to contain a small fiber washer along with loctite.

    Click image for larger version. 

Name:	025 remove 4 screws attaching gear housing.jpg 
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    Separate the mounting plate from the gearbox housing. Note the oil seal in the mounting plate.

    Click image for larger version. 

Name:	030 Oil seal in housing.jpg 
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    If the oil seal is cracked or worn, remove by driving out with a 12 mm socket.

    Click image for larger version. 

Name:	035 drive oil seal with 12mm socket.jpg 
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ID:	335711

  3. #3
    BlueFishCrisis's Avatar
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    Removed oil seal.

    Click image for larger version. 

Name:	36 oil seal.jpg 
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ID:	335712Click image for larger version. 

Name:	37 oil seal.jpg 
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    Seal is 3/4" OD x 1/4" thick. Output shaft is 3/8" Seal appears to have a double lip and spring retainer. McMaster Carr 5154T31 is the correct replacement.

    Remove the four 1/4" hex head screws holding the case halves together, then separate the case halves and ensure to push down on the output shaft to try and keep it in the "bottom" of the case.

    Click image for larger version. 

Name:	040 remove gear housing screws.jpg 
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ID:	335714Click image for larger version. 

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ID:	335715
    Last edited by BlueFishCrisis; 07-16-2014 at 06:29 AM.

  4. #4
    BlueFishCrisis's Avatar
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    Case opened, with all gears residing on the "bottom" half. This is the half that the motor attaches to. This trim motor was in good operational condition.

    Click image for larger version. 

Name:	046 gear arrangement.jpg 
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    This one was not....

    Click image for larger version. 

Name:	047 heaviily corroded.jpg 
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    For the next few steps, I have already fully disassembled, cleaned, and reassembled the gearbox so you can clearly see each component as we go through disassembly. Keep in mind that small parts like washers and spacers can get buried in the grease and corrosion. I will identify each of the small parts as we go so you can be sure to capture them during disassembly.

    Clean gearbox ready for disassembly.

    Click image for larger version. 

Name:	060 remove gear in upper left.jpg 
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ID:	335718

  5. #5
    BlueFishCrisis's Avatar
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    Note the thin washer on the output shaft. This can sometimes stick to the top of the housing. Be sure to locate it before moving forward. Remove the washer if it is on the output shaft.

    Click image for larger version. 

Name:	050 remove washer on shaft.jpg 
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ID:	335719Click image for larger version. 

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ID:	335720

    Next remove the gear in the upper left corner.

    Click image for larger version. 

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    Note the spacer under this gear. This one was stuck in place, so I did not remove it.

    Click image for larger version. 

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    First gear removed.

    Click image for larger version. 

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ID:	335723

  6. #6
    BlueFishCrisis's Avatar
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    Next remove this large spacer.

    Click image for larger version. 

Name:	075 remove large spacer.jpg 
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ID:	335724Click image for larger version. 

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ID:	335725Click image for larger version. 

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ID:	335726

    This is the next to go

    Click image for larger version. 

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ID:	335727Click image for larger version. 

Name:	095 gear removed.jpg 
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ID:	335728

  7. #7
    BlueFishCrisis's Avatar
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    Watch out for this spacer. It may be buried in grease.

    Click image for larger version. 

Name:	100 remove spacer.jpg 
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ID:	335729Click image for larger version. 

Name:	105 spacer.jpg 
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ID:	335730

    Remove the gear that spacer was sitting on next.

    Click image for larger version. 

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ID:	335731Click image for larger version. 

Name:	115 gear removed.jpg 
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    Note the very thin washer underneath. It is easy to lose this in the cleanup process as well.

    Click image for larger version. 

Name:	120 small washer.jpg 
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ID:	335733

  8. #8
    BlueFishCrisis's Avatar
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    Last one to go before the output shaft. Note the small diameter gear and how long it is. This will help identify during reinstall.

    Click image for larger version. 

Name:	125 remove gear.jpg 
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ID:	335734Click image for larger version. 

Name:	130 all gears removed.jpg 
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    Finally remove the output shaft. Note the thin washer on the bottom of the output shaft.

    Click image for larger version. 

Name:	135 remove output shaft.jpg 
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ID:	335736Click image for larger version. 

Name:	140 thin washer output shaft.jpg 
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ID:	335737Click image for larger version. 

Name:	145 remove thin washer.jpg 
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ID:	335738

  9. #9
    BlueFishCrisis's Avatar
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    Also note the collar on the output shaft.

    Click image for larger version. 

Name:	146 note collar on output shaft.jpg 
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ID:	335739


    With all parts removed, you can see the two screws securing the motor. If the motor is seized, remove these two screws.

    Click image for larger version. 

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ID:	335740Click image for larger version. 

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ID:	335741Click image for larger version. 

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Name:	157 motor 2.jpg 
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    Mabuchi RS-555SH is no longer available. I have ordered a Mabuchi RS-555PH as a replacement.

    This completes disassembly.
    Last edited by BlueFishCrisis; 07-16-2014 at 06:30 AM.

  10. #10
    waterdog1971's Avatar
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    I've meant to ask about this before, does the trim motor only work with the mfd or is it supposed to work all the time?

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