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

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MM850 MOWER Hi, I have same problem with my MM850 B&D Mower. I wanted to replace switch with some other more simple switch (ON-OFF) but dont know where to find flick-switch that would keep RED and WHITE in connection while switch OFF and keep RED and BLACK + Black AC in ON position. I guess this my way of fixing this, but I need flick-switch to replace this stupid push switch. So my friend if you have solution for this let me know. If you need I will send my email. Thanks. Predo

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  • KORGMASTER Aug 05, 2008

    Well, I think this my be possible with 3P3T mommentary ON-ON switch. (since White is brake only) So this switch in 1st ON position would pull Black and Red and connect them to Black AC feed. In 2nd ON position switch should throw Red to unused and nrutral pin where White would be connected with simple bridge wire.

    What do you think?



    Thanks

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Can't just replace the switch with on-off.original switch has interlocking with brake, once u pull the trigger the brake circuit will open & close when triggger is release. it is also parts of safety.must common problem is inside the switch terminal eventually the contact will burnt.

Posted on Aug 04, 2008

  • mr aicnelav Aug 06, 2008

    well how much u will spend for the switch like 3p3t on switch while the original is cost list than $15.00 & ur safe on it.

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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.
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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.

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