54D Male Coupler
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    rakane's Avatar
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    54D Male Coupler

    I stopped mowing today when the sound changed on my 1025R MMM. I was able to turn the male coupler by hand without any movement of the belt. I located the two allen set screws and one was very loose.

    After tightening the set screws I attached the mower and pulled the yellow mower switch. The same symptoms. Not mowing.

    Any ideas? My searchs here came up with the following photo. My operators manual is useless, they don't show any coupler.

    I have about 3 weeks left on warranty.

    Randy

    Meanwhile is a 30' Grady White.
    Last edited by rakane; 07-18-2019 at 05:06 PM.

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    Randog's Avatar
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    Maybe you just wrecked the key running it with the set screws loose. Not seated fully?

    Can you loosen the set screws and pop that auto coupler off? Look inside?

    I bought the manual connect for these reasons. Sorry I can't be of more help.
    kylew likes this.
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    There should be a large Woodruff key under the male coupling sleeve.
    Odds are not that great that you sheared it, horrifyingly, you may have stripped gears in the box...
    Remove the sleeve and have a peek.
    kylew likes this.
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    kylew's Avatar
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    Since you still have warrenty, I'd get with the dealer and have them fix it. Something happened either in the gearbox or the input shaft/male adaptor.

    The 2 set screws on the adaptor only hold it from coming off. There is a woodruff key between it and the input shaft. If the key is missing (as in, was never installed...I think that happened to another member) the set screws are the only thing transferring power to the input shaft. Their job isn't to transfer power so eventually they loosen up and you lose input.

    If you feel froggy, set the deck so the blades and belt turn freely, and remove the male adaptor off the gearbox. It may take some persuasion, I think they're on there pretty tight. Inspect the inside of the adaptor for damage and that the woodruff key is in there also. While the adaptor is off, turn the input shaft and see if the blades/belt turns. If the belt doesn't turn, the problem's inside the gearbox.

    Click image for larger version. 

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    Last edited by kylew; 07-18-2019 at 06:04 PM. Reason: Spelling
    rydplrs, Jeff B, theduke and 1 others like this.
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    rakane's Avatar
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    I appreciate the input.

    Just off the phone with service at my dealer. He feels the woodruff key is the issue with nothing likely wrong with the gear box and the spindles and belt turn freely.

    He also advised taking off the male coupler to inspect the 5 x 22 key. It must have sheared as I can turn the coupler with no movement of the belt.

    Good news is it is probably only the key, and they have one in stock. Bad news is since the key is a wear item (hit a rock) it is not covered under warranty.

    The hard part is removing that darned coupler. He suggested gentle persuasion with a brass hammer and pin. I'll try my rubber mallet with some penetrating oil.

    Again, thanks for the feedback. It helps so much to bounce ideas off the board.

    Randy

    Meanwhile is a 30' Grady White.
    BigJim55 and kylew like this.

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    rakane's Avatar
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    So here is the woodruff key that is broken off at the surface allowing the coupler to spin. The allen set screws do not any holding power compared to that key.

    Meanwhile is a 30' Grady White.
    kylew likes this.

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    rakane's Avatar
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    Must have been a larger rock than I thought.

    Meanwhile is a 30' Grady White.
    Last edited by rakane; 07-18-2019 at 07:03 PM.
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    kylew's Avatar
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    Thanks for the update Randy.

    Wheeeww....that $4 key shearing just saved you a $360 gearbox. Have you punished that rock yet?
    BigJim55, rakane and Kbar like this.
    🌠Back in my day we had 9 planets🌠

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    theduke's Avatar
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    If you can't find the rock....take your angle grinder to that "china" writing.
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    GUS FINK's Avatar
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    how did you get woodruff key out looks kinda banged up

    Click image for larger version. 

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