B&D lawnmower. How to remove blade from electric lawnmower?

Posted by mm on June 27, 2009, 11:21 am

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.

I figured if I broke the plastic fan off, I might have enough room for
vise-grips. Do you think they could nick, whatever, the shaft enough
to unbalance it?

(FTI, a third of the plastic fan was broken off so I tried to knock
off the rest with a hammer. It cracked easily and fell off in
suceessive pieces. Unfortunatately, that was stupid because I also
cracked the blade spacer, a cast metal piece, that now I have to
replace. :( 3 dollars and a trip to the store, 10 miles away.
Fortunately I have to drive by there next week anyhow.)

Thanks a lot.

Posted by Jon Danniken on June 27, 2009, 11:46 am

mm 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?

Yes, with an Impact wrench; you'll have that nut in your hand faster than
you can say, "wow, that's pretty cool".

Jon

Posted by mm on June 27, 2009, 12:31 pm

On Sat, 27 Jun 2009 08:46:40 -0700, "Jon Danniken"

>mm 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?

>Yes, with an Impact wrench; you'll have that nut in your hand faster than
>you can say, "wow, that's pretty cool".

Thanks for replying.

Do you mean the impact wrench one hits with a hammer**, or the kind
that usually uses compressed air, but comes in electric also?

**I have a manual impact wrench and I did think of it, but I figure it
might put too much longitudinal force on the bearings, and I wasn't
sure there was enough mass in the shaft and armature for it to work
anyhow.

>Jon

Posted by Jon Danniken on June 27, 2009, 12:47 pm

mm wrote:

> On Sat, 27 Jun 2009 08:46:40 -0700, "Jon Danniken"

>> mm 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?

>> Yes, with an Impact wrench; you'll have that nut in your hand faster
>> than you can say, "wow, that's pretty cool".

> Thanks for replying.
> Do you mean the impact wrench one hits with a hammer**, or the kind
> that usually uses compressed air, but comes in electric also?
> **I have a manual impact wrench and I did think of it, but I figure it
> might put too much longitudinal force on the bearings, and I wasn't
> sure there was enough mass in the shaft and armature for it to work
> anyhow.

Aye, sorry, not the manual one (I have one of those too). You can get the
pneumatic kind that requires a compressor, which are the most common, but
they also sell electric ones.

If you don't have a compressor, I have heard that the electric ones from
harbor freight do an acceptable job.

Jon

Posted by mm on June 27, 2009, 5:31 pm

On Sat, 27 Jun 2009 09:47:43 -0700, "Jon Danniken"

>mm wrote:

>> On Sat, 27 Jun 2009 08:46:40 -0700, "Jon Danniken"

>>> mm 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?
>>> Yes, with an Impact wrench; you'll have that nut in your hand faster
>>> than you can say, "wow, that's pretty cool".

>> Thanks for replying.
>> Do you mean the impact wrench one hits with a hammer**, or the kind
>> that usually uses compressed air, but comes in electric also?
>> **I have a manual impact wrench and I did think of it, but I figure it
>> might put too much longitudinal force on the bearings, and I wasn't
>> sure there was enough mass in the shaft and armature for it to work
>> anyhow.

>Aye, sorry, not the manual one (I have one of those too). You can get the
>pneumatic kind that requires a compressor, which are the most common, but
>they also sell electric ones.
>If you don't have a compressor, I have heard that the electric ones from
>harbor freight do an acceptable job.

Thahks again.

Yeah, I see they have a 12 volt Harbor Freight model for 25 dollars.
It says it has 150 foot pounds with a good battery, and 30 to 40 blows
per minute (BPM).

Then there is for 50 dollars an AC model withe 240 ft.pds and 2400
BPM.

And for 40 dollars an 18 volt battery model, 3/8", 87 foot pound, 1700
BPM

Rudy, Tim, I can't just use a socket wrench because even when I hold
the blade still, the nut and the shaft turn.

Thanks Bob and William, the manual said nothing about being
left-handed, and based on the direction the blade turns, I don't think
it is.

>Jon

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