MM875 (Type 3) Black and Decker Lawn Mower - Overview

Diagrams for MM875

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Shunted Carbon Brush – Part Number: 242273-00
$11.02
In Stock
Shunted Carbon Brush
★★★★★
★★★★★
(2)
Part #242273-00
Keep your power tools running at peak performance with this genuine replacement carbon brush. Sold individually, this brush is designed for long-lasting durability and reliable performance. Most tools require two brushes, and it's always recommended to replace both at the same time—even if only one appears worn—to ensure balanced motor function. Carbon brushes are wear-and-tear items that naturally degrade over time due to friction. Worn brushes are a common cause of poor motor performance, including intermittent operation, reduced power, and weakened electric braking. Replacing them can often restore your tool’s full functionality. Signs of wear include brushes that are worn down near the wire lead, or those that appear cracked, pitted, or burned. When installing new brushes, it’s a good idea to inspect the armature for any signs of damage such as burns or cracks, which could indicate deeper motor issues. Regular maintenance with fresh brushes helps extend the life of your tools and keeps them working like new.
Blade Insulator – Part Number: 241381-01
$10.52
In Stock
Blade Insulator
Part #241381-01
Protect your blade and reduce vibration with this durable plastic blade insulator. Designed to prevent direct contact between the spacer and the blade, this component plays a key role in maintaining smooth, quiet operation. By minimizing vibration and ensuring proper spacing, it helps extend the life of your equipment and enhances overall performance. Ideal for replacements or routine maintenance, this insulator is a simple yet effective way to keep your tools running at their best.
Lawn Mower Fan – Part Number: 241125-00
$46.71
In Stock
Lawn Mower Fan
Part #241125-00
This cooling fan and debris guard helps protect your lawn mower’s motor by circulating air to prevent overheating while directing grass and debris away from internal components. Made from durable plastic, it supports efficient operation and reduces buildup under the mower deck. Replacing a worn or damaged fan can help restore proper cooling and improve overall mower performance.
Clamp – Part Number: 062443-02
$7.44
Special Order
Clamp
Part #062443-02
Plate,Bottom – Part Number: 242379-00
$7.44
Special Order
Plate,Bottom
Part #242379-00
Spring,Torsion – Part Number: 242380-00
$7.44
Special Order
Spring,Torsion
Part #242380-00
Door – Part Number: 90511856
No Longer Available
Door
Part #90511856
Id Label – Part Number: 90530845
No Longer Available
Id Label
Part #90530845
Discharge Chute – Part Number: 242867-00
No Longer Available
Discharge Chute
Part #242867-00
Front Label – Part Number: 243616-00
$7.44
Special Order
Front Label
Part #243616-00
Upper Handle – Part Number: 243620-00
$47.20
Special Order
Upper Handle
Part #243620-00
Nut – Part Number: 038738-00
$7.44
Special Order
Nut
Part #038738-00
This is a genuine replacement part manufactured for use with outdoor power equipment and air compressors. This nut is used to fasten various part assemblies on a range of different products. This nut is sold individually, please see model diagram for part usage and location.

Common Symptoms of the MM875

How this model fails, and the parts that fix it.

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DOA
12 of 18 people found this instruction helpful.
  • Le from BIGGSVILLE, IL
  • Really Easy
  • 30 - 60 mins
  • Screw drivers
Did shorts test on motor, continuity tests on switch and rectifier. Found dead rectifier, ordered same, Installed Now OK
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Fan broke.
1 person found this instruction helpful.
  • Steven from Port Angeles, WA
  • Really Easy
  • Less than 15 mins
  • Socket set
Removed bolt holding lawnmower blade and took out washer, spacer, blade and fan. Cleaned up underside of mower then replaced fan, blade, new insulator, washer and bolt.
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