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

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I have a B & D electric lawnower model LM110 that stopped working when it rolled over a rock. Is there a fuse that can be changed, or a reset button on this model? Thanks

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  • xj750xrider Jul 01, 2008

    I have a similar problem with a LM115 mower. My magnet was broken in one spot and the blade would not turn. I disassembled the whole electric motor and vacuumed all the little magnet pieces. The blade is spinning now, but I can't remember how the wires were connected to the rectifier. A diagram or picture would help.

  • Anonymous Jul 03, 2008

    Me too.


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Unplug the mower. checked the blade & try to spin by hand the blade. if it not spinning then the magnetic ring is probably broken. if ok open the top housing that held by two screw.inspect if the armature are ok still/not broken.
there is no fuse in the unit. it uses rectifier from ac to 120 dc volts.

Posted on Jun 25, 2008

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F525. Updated mower switch by John Deere is not engaging mower

The John Deere F525, a front cutting machine, has 3 fuses.
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Check the 15 amp fuse. I believe this supports the PTO clutch. If you replace the fuse and it blows again, check the electric clutch. You will likely find burnt or melted wires. The bearings do go out on these clutches causing them to run hot and eventually burn up.

PTO Clutch will not engage: There is a very fine one page discussion on evaluating electric clutches at this site:

My JD tech manual, which covers the entire LA 100 series, agrees with the electrical specifications. It states that the Electric PTO Clutch should show the following:

Resistance 3.7 ohms
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It does include a note to check the PTO Clutch Key for damage or if missing. So there is a drive key between the PTO Clutch and the shaft. Additionally, it recommends checking the tightness of the cap screw. That's the screw or bolt that holds the clutch on the shaft.
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If the fuse blows, I recommend you check the resistance of the clutch. If the clutch is shorting to ground it will show zero resistance when you ohms the connector wire to a ground position. In which case, you will have to replace the clutch.

Fixing Electric Clutches

Other possibilities.
On the F525 there is a cut-off switch in the hydraulic system. It is a low pressure cut off. If you were running the mower and deck and then it suddenly stopped, it may be low pressure in the hydraulics. It will not automatically reset as you are using the same volume for the drive pumps. Once the oil gets low enough it cuts out the deck drive 1st, then the drive pumps.

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1 Answer

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Hi. That 20A fuse is basically the main fuse. But what is year model and is engine Kohler or Briggs & Stratton? It may depend on the above, but on an L110 the circuits that need to be protected are mainly the Charging Circuit, the Operator Presence Safety Circuits, and power for the Fuel Shut-off Solenoid which is under the carby fuel bowl. If the fuse blows the fuel shut-off solenoid will close and after a few seconds the engine will stop. But even if the engine could keep running the safety circuits would respond as designed and earth out the magneto and that would stop the engine. The engine has an AC "alternator" under the flywheel and a rectifier/regulator which changes the alternator's output current from AC to DC and then regulates it to suit the battery's needs. Depending on engine model this charging system may have up to 16A capability, so that is why the fuse is 20A.
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Why does my mower keep blowing the 20 amp fuse

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sounds as though you are on the right track
but be sure to check the wiring directly from the electric clutch on the front of the motor back to the switch
a wire could be pinched in the frame and shorting out intermittingly
look around and find those wires and move them around and look for chaffing and tightness
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