There might be a power loss in the mains lead. Mowers aren't renown for substantial power leads but your mower is rated at 12 amps which not only requires a substantial power lead, the longer the lead is the greater the power loss the lead will cause and the more substantial the lead should be.
As a rule of thumb if minimal power loss is required the cross sectional area of the cable should be doubled every ten metres - completely impractical, therefore some power loss has to be expected.
The commonly used series wound motor is light and powerful and produces lots of torque when it is working hard at reduced speed but produces little power at maximum revolutions so introducing it to work will always result in a speed reduction. You are complaining of a speed reduction where mowing is harder work.
I suggest you service the motor, ensure the blade is sharp and thoroughly inspect the power lead and raise the mower bed a little where the cutting is the hardest and you will have done all you can reasonably do.
SOURCE: Black and decker mm875 mulching
check handle terminal if not burnt/melted,switch terminal ,
terminal on the rectifier & thae armature commutator.inspect & report.
SOURCE: New black and decker lawn
did you sharpened the blade. checked the blade if not installed reverse.B&D clean the blade. info in the blade say's facing the grass
SOURCE: I have Black and decker electric lawn mower does not start
one of the problems i found with electric detectors was that they do not tell you if there is a break in the neutral cable so you could have a break there,another problem is that the levers can break inside the cover giving the impression that it should work but is not making contact with the switch ,hope this helps
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