Question about Black & Decker Black and Decker Mm575 18" Mulching Lawn Hog Electric Lawn Mower

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Black and decker mm575 worked fine but now the motor tries to start but locks up and just hums. Any idea

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Steve it sounds like the brushes located at the top of the motor. They need replacing.

Posted on Oct 21, 2013

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Posted on Jan 02, 2017

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SOURCE: how do i tighten the blade on a black and decker MM575-18

Hi Kevin,

User a pair of channel-locks to grab the square spacer below the nut. Then tighten down the nut using wrench.

Posted on Dec 08, 2012

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1 Answer

I need the electrical motor P/N 90565704-04.


Do you need a new motor or is it just the brushes which need replaced? Firstly unplug the machine and disassemble the motor or gain access to the brushes, found on either side of the motor at one end only. Remove the brushes (they usually unscrew behind the black caps), if they are burnt or look badly worn or are less than 5-8mm in length, replace them. The BRUSH is the black carbon rectangle of hard material at the end of the brass spring. New brushes are often 25-30mm in length as a guide. Based on that information you then decide if new brushes or a new motor is the answer. A quick tip; If you remove the motor and clamp it safely, connect the correct voltage to the motor lead and switch on long enough to establish if it is working and running freely. If you cannot find the parts locally, try www.4ourhouse.co uk.

Apr 17, 2016 | Black & Decker Black and Decker Mm575 18"...

1 Answer

Electric lawn mower stopped working


Take off the black plastic hood (4 screws), clean debris and check connections to, and condition of, shunted brushes. They're available from B&D parts for a few bucks.

Jun 20, 2014 | Black & Decker Black and Decker Mm575 18"...

1 Answer

Black and decker lawn hog 18 was working fine last time used but will not start now what,s the problem


while unplugged rotate the blade a few spins to move the brushes if there stuck make sure the outlet is good and try another power cord

Aug 13, 2012 | Black & Decker Black and Decker Mm575 18"...

1 Answer

How do i tighten the blade on a black and decker MM575-18


Hi Kevin,

User a pair of channel-locks to grab the square spacer below the nut. Then tighten down the nut using wrench.

May 07, 2012 | Black & Decker Lawn Hog 18-Inch 12 Amp...

1 Answer

Electric mower keeps slowing down and stopping


Two things come to mind. The brushes in the motor should be replaced. (Get them at a local motor repair shop, but take one of them in with you to get the correct one). If that is not the problem it may be the switch in the handle that you turn it on and off with. The switch may be corroded or bent. Good luck...Lee

May 29, 2010 | Black & Decker Black and Decker Mm575 18"...

1 Answer

I HIT A ROCK WITH MY MM575 AND THE MOTOR STOPPED. IT WILL NOT START


Sounds as though you either broke or badly damaged the flywheel key. It is located on the shaft that comes up through the flywheel. If you have ever taken the cowling off, you know how. Just make sure to use the proper size and shape flywheel key. This key is designed to break in order to save the more valuable parts of the machine. Good luck...Lee

Sep 16, 2009 | Black & Decker Black and Decker Mm575 18"...

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