Question about Black & Decker 19" Electric Lawnhog Mulching Mower with Rear Bag

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Black and decker mm675 lawn hog

I took the blade off of my b&D electric mower, but I cannot figure out how to lock the shaft to get the blade nut tight. Any ideas?

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  • Anonymous May 29, 2008

    i tried wedging the 2x4 in place but i could not get the lockwasher to slide into place. the blade axel would not stay far enough out for it to lock the axel while i turned the nut

  • dug6g-004 May 11, 2010

    I have a similar problem, but I'm trying to get the blade *off* so I can replace it and the fan and the plastic blade insulator. The instruction manual says to use a 2x4 to keep the blade from turing. Well it keeps the blade from turning, but the shaft turns freely even when the blade is held in place with the 2x4. So the question is, how do I lock the shaft to loosen or tighten the nut when the blade does not hold the shaft like it's apparently supposed to do?



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Wedge a short piece of 2x4 between the blade and the housing,
turn clockwise to tighten !

Posted on May 23, 2008

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I'm not sure, but I think the little black plastic thing that holds your blade in place is damaged, I am having a similar problem where the shaft is spinning and not catching the blade. Now trying to replace that part the shaft was spinning with the nut I was trying to replace. I finally got it off by using a vice grip to hold the square metal and damaged plastic part in place while turning the nut. However now I am having a hell of a time finding the replacemet part that says right on it "replace if damaged"

Posted on Sep 07, 2009

  • dsopala Sep 07, 2009

    Found the part, it's called an insulator. you can find it at sears, I figured out exactly which part I needed for my model from the Black and Decker website. the one for my lawn hog mm875 is 241381-01


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After you install the fan the next step is to install blade then plastic spacer either orange or black spacer then the metal washer and the nut. nut will fit the 2 flat side of the shaft hold it while tightining the nut.

Posted on May 29, 2008

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check out for parts diagram for proper installation. the 2 last step is the square metal washer then the nut. to install the metal washer the match the shaft guide. if still can't tighten the nut then the problem is the armature ring may drop down.

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