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

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Mower tripped outlet breaker - wiring schematic available?

It appears that the mower shorted either in the winding or the solid state switch loacted on top of the motor. Is there an electrical wiring diagram available for the Black & Decker Lawn Hog 19"? Thanks, David

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  • Tequila Dave Jun 16, 2008

    If you can't offer a solution without a paid assistance plan, just say so!

  • jenncatron Jul 14, 2008

    I've already replaced the switch once but list the part #. Need the diagram for the MM895 model with the parts #. Please send via email to Jenncatron@charter.net

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I had a MM875 go out after some months' service -- it actually went out with a bit of a bang. The problem was a shorted circuit; the weather was hot and the "solid state switch" on top of the motor shorted out. This part wasn't a switch but a bridge rectifier. The original part was specified a bit close to its actual working limits so I bought another (from Radio Shack, no less) that was higher rating -- something like 30 amps at 200 or 400 volts. ITs worked for years.

If it is a bridge then it will have two terminals labelled '~' and one each with the '+' and '-'. The plus and minus go to the motor (keep those connections the same as the original) and the others go to the supply wires.

Posted on Jul 15, 2008

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Electrical diagram available i send it to your email just give your email add.

Posted on Jun 16, 2008

  • mr aicnelav Jun 16, 2008

    can i send to by fax. just give to me the fax #

  • mr aicnelav Jun 19, 2008

    i am not asking for your paid assistance. thats all

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My story is the same. I have an MM600, replaced switch, and still trips breaker in variety of configurations. I have tried both of the relevant configs recommended on this site, and no luck. Is there...


As you know a breaker tripping is a result of a direct short inside the electrical circuity of your mower.

That short can be anywhere from just beyond the switch all the was down to the winding in the motor.

There are 2 switches Item 3 and Item 7 of this link:
http://www.toolpartsdirect.com/cgi-bin/noframes.cgi/blackdecker/MM600_TYPE_1

Places for a short are the power wire from the switch to the motor connection. (Item 28 of link)
http://www.toolpartsdirect.com/cgi-bin/noframes.cgi/blackdecker/MM600_TYPE_1

A broken motor brush where the carbon brush has broken off and the metal from the spring is now touching wither the motor chassis or across multiple segments of the armature.

Check items 46, 47, 48, 48 this link for damage:
http://www.toolpartsdirect.com/cgi-bin/noframes.cgi/blackdecker/MM600_TYPE_1

Also check Item 80 Brush of the above link (picture below link
http://www.toolpartsdirect.com/cgi-bin/parttools.cgi/242273-00

A bearing in the motor can have failed allowing the armature Item 65 of link to drag on the stator item 70 of link and cause a stator short where the armature damaged the stator winding.

The above items are all things that can cause your problem. It will take a multi-meter and some resistance checks of the circuit to isolate exactly where the short is.

I would connect the meter across the 2 power cord terminals i.e unplugged and simulate mower use then start disconnecting wires one at a time working my way backward from the motor to see when the short disappeared. If the short is in the motor... then we are back to all of the times above except the cord and switches. The all have to be isolated and checked out.

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1 Answer

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Did you check the outlet, you might have tripped the breaker,
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Plug the mower into a outlet that you tested with a lamp or something
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What ever outlet you use to plug this thing into, you should have a ground fault outlet installed, for two reasons, safety for you, and protect the mower.

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2 Answers

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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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