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Posted by on June 28, 2009, 3:39 pm
I don't recall the model I have (it is battery powered), but I
just sharpened the blade for the first time a few days ago. A gloved
hand held the blade while a box wrench turned the bolt holding it on.
It was threaded normally and did not require an unusual amount of
force.
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Posted by on June 29, 2009, 12:45 pm
wrote:
>Black & Decker lawnmower. How to remove blade from electric
>lawnmower? Model MM525 which is very much like the MM575.
>Is there a simple, or complicated, way to keep the motor shaft from
>turning, when trying to loosen the nut on the end of the shaft?
>I have to remove the blade to replace the fan and the manual says to
>use a 2x4 to keep the blade from turning. I do keep the blade from
>turning, but the nut and shaft turn together anyhow, so there is no
>unscrewing.
If stopping the blade doesn't stop the shaft then what drives the
blade?
Something is wrong. Somehow the blade is slotted, flat sided,
or some other means of coupling is suppose to take place. Push
the blade down onto the shaft while turning the nut.
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Posted by mm on June 29, 2009, 10:10 pm
On Mon, 29 Jun 2009 12:45:29 -0400, tnom@mucks.net wrote:
>wrote:
>>Black & Decker lawnmower. How to remove blade from electric
>>lawnmower? Model MM525 which is very much like the MM575.
>>Is there a simple, or complicated, way to keep the motor shaft from
>>turning, when trying to loosen the nut on the end of the shaft?
>>I have to remove the blade to replace the fan and the manual says to
>>use a 2x4 to keep the blade from turning. I do keep the blade from
>>turning, but the nut and shaft turn together anyhow, so there is no
>>unscrewing.
>If stopping the blade doesn't stop the shaft then what drives the
>blade?
The blade is on tight enough that the motor will spin it, and it cuts
well. But it's not on tight enough to hold the shaft in place when
trying to unscrew the nut on the end.
> Something is wrong. Somehow the blade is slotted, flat sided,
There was a picture which was about balancing the blade after it is
sharpened, and it showed the center hole as round.
I broke a part on Friday, and just got it today, Monday. I'll probably
work on it tomorrow and I plan to let you all know tomorrow night, if
the thread hasnt' gone up into the wild blue yonder.
>or some other means of coupling is suppose to take place. Push
>the blade down onto the shaft while turning the nut.
I
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Posted by on June 30, 2009, 12:50 am
>>If stopping the blade doesn't stop the shaft then what drives the
>>blade?
>The blade is on tight enough that the motor will spin it, and it cuts
>well. But it's not on tight enough to hold the shaft in place when
>trying to unscrew the nut on the end.
>> Something is wrong. Somehow the blade is slotted, flat sided,
>There was a picture which was about balancing the blade after it is
>sharpened, and it showed the center hole as round.
It may be round but I believe it is splined. Don't damage the spline
on the motor shaft by letting the blade spin.
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Posted by on June 30, 2009, 1:05 am
>I broke a part on Friday, and just got it today, Monday. I'll probably
>work on it tomorrow and I plan to let you all know tomorrow night, if
>the thread hasnt' gone up into the wild blue yonder.
>>or some other means of coupling is suppose to take place. Push
>>the blade down onto the shaft while turning the nut.
Look at this picture of the armature. Notice the flat spots on the
shaft. At the very least attempt to hold the armature on the flats.
http://cgi.ebay.com/Tools-Part-Direct-242028-08-Armature-Part-Assy-New_W0QQitemZ250451489071QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3a5012712f&_trksid=p3286.c0.m14&_trkparms=65%3A12%7C66%3A2%7C39%3A1%7C72%3A1240%7C240%3A1318%7C301%3A1%7C293%3A1%7C294%3A50
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>lawnmower? Model MM525 which is very much like the MM575.
>Is there a simple, or complicated, way to keep the motor shaft from
>turning, when trying to loosen the nut on the end of the shaft?
>I have to remove the blade to replace the fan and the manual says to
>use a 2x4 to keep the blade from turning. I do keep the blade from
>turning, but the nut and shaft turn together anyhow, so there is no
>unscrewing.