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



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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 lawn mower just stopped working. I was mowing along and it just stopped. It is an electric Black and decker. I was mowing regular grass, nothing complex. It was working fine before that. It is very new...

Open your circuit breaker box. Locate the breaker that has tripped. Turn the breaker OFF (it is in a mid position). Then turn it back ON. Before you do that you need to ask yourself, why did the circuit breaker trip? They trip because of an overload of current. Is something else running on that same circuit, say for example an electric heater or something similar? Depending on the rating of that circuit breaker (15 or 20 amps) you may be drawing too much current. Look for anything else that could be running on the same circuit (only so many outlets can be put on the same circuit). Disconnect or turn off all other devices. Attempt to operate your mower again. If the breaker trips again, then there is something wrong with your mower (electrical short?).

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When I pull the red lever on the electic mower, the lawnmower will not start and the GFI to my house is being popped?

just for a quick test -- run power to the mower using a different outlet,,, GFI outlets are well known for having a bad trip circuit in them,, they go bad all the time. so if your mower does in fact work on a different outlet with no problems then the issue is your GFI outlet and you will need to replace it.
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Your circuit breaker will trip because of two main reasons:
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  • Power Lawn mower has become unsafe as your active live is able to reach your earth connection (e.g. short-circuit). Make sure that you have correctly reconnect ALL your power leads wires (check that the Active and Neutral wires have not been transpose). With power off/device unplug, use a multimeter on resistance range and verify that your active lead pin is not showing a reading against the Earth (middle) pin when the mower switch is turn on or off! There should not be any resistance reading between the Earth and Neutral (opposite pin to Active) pins either!
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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:

Places for a short are the power wire from the switch to the motor connection. (Item 28 of link)

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:

Also check Item 80 Brush of the above link (picture below link

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.


May 02, 2010 | Black & Decker 19" Electric Lawnhog...

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Cut cord with mower by accident. connected new cord but no dice. is there a reset button?

Did you check the outlet, you might have tripped the breaker,
or you fried the outlet.

Plug the mower into a outlet that you tested with a lamp or something
so your sure there is power at the outlet, and at the end of the extension cord, if there is power to both but not the mower, contact the company because there is no reset button.

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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Using the multimeter again, check for continuity between the round ground pin on the power cord and each of the two flat prongs. If you get continuity on either of these, there is a short to the mower chassis. This can probably be corrected without much expense.

My bet is on the motor winding being shorted.


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