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

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The cord that runs from the motor to the switch on the handle of my Black and Decker Electric lawnmower model mm675 has bare wires where it passes next to the pivot point on the handle. Actually it is worn where the latch stops the handle. I think I can replace the cord myself but was wanting to let you know of this problem. It seems like a design flaw and potential safety hazard.

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I decided to modify mower myself. I replaced the corrogated plastuc that covered the cord with a smaller in diameter plastic sheething and then I cut two slots in motor cover and tywrapped the sheething to the cover.
The result was the cord now does not touch the handle bracket.

Posted on Aug 25, 2008

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Never heard of any recall for this type of mower

Posted on Aug 25, 2008

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Inherited with my new house a lawn mower in good condition black and decker lm110 not sure how to work it / how to plug it in no manual with it


if its electric its pretty simple, a normal standard extension cord will plug right into the socket on the machine,, the only thing left would be the switch,, depending on the year and model,, it could be along the handle rail, or actually part of the handle itself, Just pull on it to make the motor start, if it doesn't start, you can check the switch to see if you have power going to it and when activated passes through to the motor, if that doesn't work,, thats probably why they left it,, the replacement motor would cost as much as a new unit

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if its not in the cord. it may be the brushes in the motor. if they are worn down and not hitting armature. motor will not run. good-day !

May 05, 2011 | Black & Decker 19" Electric Lawnhog...

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The "wedge" of the plastic lever wears, so you need to replace the lever or build up that section of the lever. Some cyanoacrylate (Super Glue / Krazy Glue) and a piece of a zip tie will work.

Sep 23, 2009 | Black & Decker 19" Electric Lawnhog...

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In replacing push button switch INDAK 681064-01N I forgot to record the wiring sequence, please help


If you look at the switch with the pushbutton on the top, the white wire from the cord to the motor attaches to the upper left terminal, the red wire from the cord to the motor attaches to the lower left terminal (just below where the white wire attaches), the black wire from the cord to the motor attaches to the upper right terminal and the short black wire going to one of the two pins that plug into the extension cord attaches to the lower right terminal (just below the where the black wire to the motor cord attaches).

Jul 11, 2009 | Black & Decker 19" Electric Lawnhog...

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It sounds like you have a loose connection somewhere in the motor

Sep 25, 2008 | Black & Decker 19" Electric Lawnhog...

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open up the top cover of the mower & inspect the armature commutator & brushed if not broken.also checked for loose connection on the rectifier,extension terminal on the switch handle then the switch the last to checked ig any burnt on the terninals too. this are common probel may occur if mower not running.

Jul 19, 2008 | Black & Decker 19" Electric Lawnhog...

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the connection the are not right. top left side is for white wire.buttom left side is for red wire. top right side is connected to black wire from motor. buttom right side is for is going to the
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Jun 02, 2008 | Black & Decker 19" Electric Lawnhog...

6 Answers

Black and Decker Electric Lawn Mower MM850 wiring diagram


I have repaired mines. It was found in the trash dump, just before street curb side trash collection. It is a very sophisticated lawn mower. It taken me a month to restore it. The problem is the housing is poor design and does not hold the pin switch securely. This is not a simple on/off switch. It is switch module with two momentary switches built in to it to work simultaneously. The hot is a normally open momentary switch and the neutral is a normally closed momentary switch. Two things must occurred simultaneously for the lawn mower to work. The AC hot has to close and the neutral to open. This is a split phase AC motor. The switch has four connectors to it. The first two has black wires to it, for the hot, that is normally open. The second two has a white wire and red wire to it for the motor's start up winding. The orange connects with the plug's white, neutral. A new substitute switch will be two individual momentary switch, one for the two black wires will be normally open and the two for the red and white wires from the motor start coil will be normally close. It will take two fingers to operate the lawn mower. I recommend you to buy a new and each switch from Black and Decker.
The problem with the system is not the switch, but the poorly designed switch box housing. Often, there is nothing wrong with the switch. I tested mines and it works fine. The problem is the switch box housing does not keep the switch in the correct position for the higher tension spring lever to press against it to operate. I use small washers to stack between the rear of the switch inside and reassembled the switch box upside down by turning the handle upside down, so the washers and switch do not fall out. Once I am finished assembling the switch box and position it on the handle, then I position the handle back to the normal top side and attach the handle back to the lawn mower. I am finished.
http://en.wikipedia.org/wiki/AC_motor#Split-phase_induction_motor

"Split Phase Motors
Split phase ac motors are widely used for low power applications as for example in oil burners, furnace blowers, garage door openers and major appliances. Such motors employ separate run and start windings connected in parallel across the acpower source. When the motor is initially energized both windings are energized, and when the rotor speed reaches about eighty-five percent of the normal running speed the start winding is disconnected from the circuit. Various devices are utilized forthis latter purpose and include centrifugal switches and current and voltage relays.

A problem which is characteristic of these motors is that they have a relatively short operating life. The principal reason for this is the failure of the switching devices used to cut out the start windings when the rotors approach the normalrunning speeds.Failure of these switching devices in turn cause the start windings to burn out.

One of the reasons for the failure of these switching devices is the high currents which they are carrying at the time the contacts open. Attempts to increase contact life by use of improved designs and materials have not been altogethersuccessful. Another disadvantage associated with these switching devices is that they are necessarily quite large and occupy a substantial space in the motor housing." -from another web site.

Feb 06, 2008 | Black & Decker 19" Electric Lawnhog...

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