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

2 Answers

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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1 Answer

Black & decker Electric push mower Runs slow and trips breaker


If you are using an electrical power extension I would first try the mower without an extension and see if it is still running slow. A bad extension cord (too little gauge wire) or (poor contact points at the connectors) could be the problem. If you have access to electrical meters check voltage at the mower and if possible measure operating current using an amperage meter and check if it is in line with values on the mower name plate. Then come back with the results.

Nov 17, 2016 | Black & Decker Garden

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I have a Black and Decker Electric Lawn Mower MM525. Trips breaker when I start it.Was working great,Started it again and now it trips breaker. Mike


the brushes in the motor may be shorting out. check or replace the motor brushes. be sure cord is not the problem.and check the plug also. good-day !

Oct 16, 2011 | Black & Decker 19" Electric Lawnhog...

2 Answers

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.

Kelly

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

1 Answer

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.

Feb 05, 2010 | Black & Decker 19" Electric Lawnhog...

1 Answer

Craftsman riding mower Model 917.270824


I do not believe there is a manual available to the public for troubleshooting, however, you have at least 3 switches to tell the mower to stop when blades are engaged or clutch pedal released.

Seat switch
pedal switch
mower engage switch


The pedal and mower lever switches are identical, and have two sides, one for starting, one for blades turning. One side can fail. The pedal switch is on the frame very close to the pivot point of the pedal/shaft. The mower switch will be under the dash close to the bottom of the lever.

1) Locate and inspect the switches for broken or pinch wires, switch housing, or loose mounting, and how each lever or pedal engages the swtich.


2) This is a picture of the wiring so that you can get a better idea of location.

http://www.searspartsdirect.com/partsdirect/getSubComp.pd?modelNumber=917270824&productCategoryId=1509200&brandId=0247&modelName=TRACTOR&diagramPageId=00011&componentDescription=SCHEMATIC%20DIAGRAM-TRACTOR&documentId=P0811014&blt=06

http://www.searspartsdirect.com/partsdirect/getSubComp.pd?modelNumber=917270824&productCategoryId=1509200&brandId=0247&modelName=TRACTOR&diagramPageId=00001&componentDescription=ELECTRICAL&documentId=P0811014&blt=06

Nov 11, 2009 | Craftsman Garden

1 Answer

MM600 - New Switch - Trips Breaker


Wiring Instructions recommended here:

https://www.fixya.com/secure/support/t2575192-in_replacing_push_button_switch

http://www.fixya.com/support/t383610-wiring_diagram_black_decker_electric

http://www.fixya.com/support/t2997089-black_decker_19in_electric_mower


Sep 22, 2009 | Black & Decker 19" Electric Lawnhog...

1 Answer

Electric lawn mower mm850 wont start, trips breaker.


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.

Jul 10, 2009 | Black & Decker 19" Electric Lawnhog...

1 Answer

Need wire schematic for starter switch


I am holding the switch part (INDAK 681064) with the black pushbutton switch to the right.
The two wires on the top are Red then White. The two wires on the bottom are both black.

Apr 10, 2009 | 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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