Question about Black & Decker 19" Electric Lawnhog Mulching Mower

1 Answer

Can you tell me how to open up the switch/lever housing on the B & D electric mower? The orange handle came off in my hand and I want to open it up to see if something is broken or if it may just have slipped off something or other. Thanks very much

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  • edsmarion May 24, 2011

    Here's the parts diagram. Not much help. It does appear as if there are multiple screws/nuts in addition to one large Phillips-head screw. I can't for the life of me figure out what kind of tool I need to unscrew these other screws. http://www.ereplacementparts.com/images/...



  • edsmarion May 24, 2011

    Thanks very much!

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  • Master
  • 19,396 Answers

Hi.

It depends on the model. The housing is usually held by screw. In the following link you find exploded views showing the position of the screws for each model. Please click here and select your model to get the full exploded view.

Regards.

Ginko

Posted on May 24, 2011

  • Ginko
    Ginko May 24, 2011

    Hi.

    You need a security screwdriver, which is a tool that is supposed to be provided only to authorized technicians.

    Buy a security set with all tips for less than $15, that will do the job and it is a tool that every DIY person must have. Here a complete set: Grip on Tools 62100 - 100 PC Security Screwdriver Bit Set.


  • Ginko
    Ginko May 24, 2011

    You are welcome.

    All the best.

    Ginko

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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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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.
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