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

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Black and Decker Electric Lawn Mower MM850 wiring diagram

Hi, need to know the wiring diagram, four wires, one red, one white, two black one black with plastic coating other black no coating.

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  • Anonymous Mar 24, 2008

    how do you bypass switch on mower

  • pool prodigy May 13, 2008

    installing new switch.need wiring diagram for mm850.need to know wich color wire goes on wich terminals.

  • Anonymous Apr 17, 2009

    I have the same problem but I dont know where to locate another switch the one I have is fryed

    I have been thinking about bypassing the switch does anyone have any sugestions

  • fanyangto May 11, 2010

    Axio Your explanation of this problem is perfect. I picked up a black &decker M600 on the street. The same problem - the contact for the motorcircuit is badly burnt even though it's 8/10 new machine to me. Thecontact for the starting circuit, however, remains pretty clean.Swapping them and the machine runs again. But I won't expect this lastvery long before the switch gets burnt again. The problem is also reported by an amazon reviewer. http://www.amazon.com/review/R2PPC2YREXO... If you could tell us what new switch to buy (part number?) to replace this poorly designed switch, that would be super. I don't want to buy yet another switch that may not last very long.

  • Anonymous Mar 23, 2014

    do not know what with wire for coil

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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.

Posted on Sep 08, 2009

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Where can I to buy brush for electric mower as mm850?

Posted on Jun 16, 2013

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Show wiring for electric lawnmower , is it capactor run or start? Still runs with only two wirers only two blacks and a whhite

Posted on Oct 26, 2010

There is a solution for this problem at another website, the link is

http://www.ridgidforum.com/forum/showthread.php?t=8535

check it out and good luck

Posted on Mar 26, 2008

There is a solution for this problem at another website, the link is

http://www.ridgidforum.com/forum/showthread.php?t=8535

check it out and good luck

Posted on Mar 26, 2008

My rectifier swith went on my mower that's why none of the wiring combinations worked for me. Rectifier switch for electric lawn mowers Document Type and Number: United States Patent 4430604
Abstract: A switch is disclosed which includes both a switching assembly and a bridge rectifier, the switch assembly including contacts for connecting a DC motor such as the motor of an electric lawn mower, to AC supply lines or for short-circuiting the motor to rapidly stop rotation of the motor. Diodes of the bridge rectifier have terminals which are directly secured to portions of metal members which also carry contacts of the switch and/or serve as terminals for connection to the motor or the supply lines.

Posted on Sep 21, 2008

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