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

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Motor has low torque

On/off switch fried. I replaced the switch, now motor will start slowly and wind up to a high speed, but will instantly bog down and stop if I push the mower into any grass. I press down on the handle and lift the blade, and the motor will again slowly build up speed. Replaced brushes and dressed commutator, replaced bridge rectifier. Rotor spins easily with no apparent drag or roughness in the bearings. Problem persists.

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Common complains for electric & cordless mower is that they are not ment for cutting on wet or dump grasses or long tall grasses they will bog down. for this type of unit blade should be extremely sharp. also clean the under the deck so you can better air flow for the blade. if your switch & rectifier are new & in right connection then have you armature check for short circuit..

Posted on Jul 27, 2008

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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...

3 Answers

BACKFIRES THROUGH CARB,WONT START ,MOTOR IS KAWASAKI FC420V IN A JOHN DEERE LAWN TRACTOR


Most likely water in the fuel. Drain the tank and clean the carb. replace with fresh gas. Mr fix it is a dumby

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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...

4 Answers

It just stopped


Mine stops like described above... but after I go to garage and dirnk 1/2 beer while watching NASCAR, then go back and mower works great.... but only for a few minutes on hot days.  Results in lots of beer consumed, but great NASCAR covereage.  On cooler days, it stops less often, but still stops.  Results in less beer consumed, but I haven't a clue who won the Busch series today.
I thnk it's a temperature thing... but not sure about that.  Sometimes works great, even on hot days; but not worth a crap on cold days.  Go figure.
OTHERWISE, I love my cordless electric mower.... I just with I could mow the whole damn lawn without interuption.

Jun 01, 2007 | Black & Decker 19" Electric Lawnhog...

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