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Black Max BM21LWSS - User Manual

Black Max BM21LWSS
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21 in. LAWN MOWER
21 pulg. PODADORA
BM21LWSS
OPERATOR’S MANUAL
MANUAL DEL OPERADOR
To register your Black Max product, please visit:
www.blackmaxtools.com
Para registrar su producto de Black Max, por favor visita:
www.blackmaxtools.com
Do not use E15 or E85 fuel in
this product. It is a violation of
federal law and will damage the
unit and void your warranty. Only use unleaded gasoline
containing up to 10% ethanol.
No utilice combustibles E15 o E85 con este producto. Esto
constituye una violación a la ley federal, dañará la unidad y
anulará la garantía. Utilice únicamente gasolina sin plomo
que contiene hasta 10% de etanol.
NOTICE AVISO
WARNING: To reduce the risk of injury, the user must
read and understand the operator’s manual before using this
product.
ADVERTENCIA: Para reducir el riesgo de lesiones, el
usuario debe leer y comprender el manual del operador antes
de usar este producto.
TABLE OF CONTENTS
Important Safety Instructions ................................................2-4
Symbols ...................................................................................5
Features ...................................................................................6
Assembly ..............................................................................7-8
Operation ............................................................................9-11
Maintenance .....................................................................12-14
Troubleshooting .....................................................................15
Parts Ordering/Service ............................................. Back Page
ÍNDICE DE CONTENIDO
Instrucciones de seguridad
importantes
..........................................................................2-4
Símbolos ................................................................................. 5
Características ........................................................................ 6
Armado ................................................................................7-8
Funcionamiento .................................................................9-11
Mantenimiento .................................................................12-14
Corrección de problemas ..................................................... 15
Pedidos de piezas/servicio ................................ Pág. posterior
SAVE THIS MANUAL FOR
FUTURE REFERENCE
GUARDE ESTE MANUAL
PARA FUTURAS CONSULTAS

Table of Contents

Questions and Answers

  • R
    ryan01Aug 14, 2025
    Why my Black Max BM21LWSS Lawn Mower is not starting?
    • J
      Joseph JohnsonAug 14, 2025
      There are several reasons why your Black Max Lawn Mower might not be starting. It could be due to: * No fuel in the tank: Fill the tank. * A shorted or fouled spark plug: Replace the spark plug. * A broken spark plug (cracked porcelain or broken electrodes): Replace the spark plug. * Ignition lead wire shorted, broken, or disconnected from the spark plug: Replace the lead wire or attach it to the spark plug. * Ignition inoperative: In this case, it is best to contact a qualified service center.
  • L
    Lisa MoralesAug 18, 2025
    What to do if my Black Max BM21LWSS is vibrating at higher speed?
    • M
      Margaret MartinAug 18, 2025
      If your Black Max Lawn Mower is vibrating at a higher speed, it could be due to an unbalanced, excessively, or unevenly worn blade, in which case you should replace the blade. Another potential cause is a bent engine shaft. If you suspect a bent engine shaft, stop the engine, inspect for damage, and have it repaired by a qualified service center before restarting.
  • K
    Kristen FerrellAug 21, 2025
    Why does my Black Max Lawn Mower engine stops while cutting?
    • S
      stephaniesmithAug 21, 2025
      If your Black Max Lawn Mower engine stops while cutting, it might be because the cutting height is set too low. Try raising the cutting height.
  • M
    Matthew GrahamAug 25, 2025
    How to fix Black Max BM21LWSS Lawn Mower not mulching properly?
    • L
      lisa52Aug 25, 2025
      If your Black Max Lawn Mower isn't mulching properly, it might be because wet grass clippings are sticking to the underside of the deck. Wait until the grass dries before mowing. Alternatively, the grass might be too thick, so try raising the cutting height.
  • S
    Samantha MilesAug 28, 2025
    What to do if Black Max BM21LWSS is not bagging properly?
    • J
      jenniferhammondAug 28, 2025
      If your Black Max Lawn Mower isn't bagging properly, it could be that the cutting height is set too low, so raise the cutting height. It could also be that you're walking too quickly while mowing; try slowing your pace.
  • M
    mary59Aug 31, 2025
    Why is my Black Max BM21LWSS Lawn Mower hard to push?
    • S
      Shawn EscobarAug 31, 2025
      Your Black Max Lawn Mower might be hard to push due to high grass, the rear of the mower housing and blade dragging in heavy grass, or the cutting height being too low. Try raising the cutting height.
  • G
    Gerald PerezSep 3, 2025
    How to fix Black Max BM21LWSS cutting grass unevenly?
    • J
      Joseph WatsonSep 3, 2025
      If your Black Max Lawn Mower is cutting grass unevenly, it might be because the lawn is rough or the cutting height isn't set properly. Adjust the cutting height to resolve this.
  • J
    John HolmesSep 7, 2025
    What to do if Black Max Lawn Mower self-propel is not working?
    • B
      brookelittleSep 7, 2025
      If the self-propel function on your Black Max Lawn Mower isn't working, it could be that the drive belt is off the pulley. Contact a qualified service center in this case.
  • B
    bakerrobertSep 12, 2025
    Why is my Black Max BM21LWSS Lawn Mower self-propel too slow?
    • F
      fmooreSep 12, 2025
      If your Black Max Lawn Mower's self-propel is too slow, the drive belt may be worn. Contact a qualified service center.

Summary

Important Safety Instructions

Symbols

Features

Product Specifications

Details engine size, cutting path, height adjustments, and wheel size.

Assembly

Unpacking and Inspection

Instructions for carefully removing and inspecting the product and its accessories after unpacking.

Handle Assembly and Adjustment

Steps for unfolding and adjusting the mower's handle assembly for proper use.

Extending the Upper Handle

Guide to extending and securing the upper handle of the mower.

Operation

Mower Applications

Details the intended uses of the lawn mower, primarily for mowing lawns.

Adding and Checking Engine Lubricant

Procedure for adding and checking the engine oil level before and after use.

Ethanol-Blended Fuels Notice

Warning against using E15 or E85 fuel, recommending only gasoline up to 10% ethanol.

Fueling and Refueling

Safe procedures for adding fuel to the mower, including precautions.

Operating the Mower

Instructions on how to start, operate, and stop the lawn mower.

Mowing Tips

Advice on clearing the lawn, cutting grass height, and cleaning the mower deck.

Slope Operation

Precautions and guidelines for safely operating the mower on slopes.

Emptying the Grass Catcher

Steps to safely stop the mower and empty the grass catcher.

Maintenance

General Maintenance

Guidelines for cleaning plastic parts and the mower exterior.

Lubrication Information

Details about bearing lubrication requirements for the unit.

Replacing the Cutting Blade

Step-by-step guide for safely removing and installing a new mower blade.

Storing the Mower

Instructions for safely storing the mower, including short and long-term storage.

Long-Term Storage

Specific steps for preparing the mower for long-term storage, including engine care.

Maintenance Schedule

Table outlining recommended maintenance tasks based on hours of use or time.

Troubleshooting

Service and Support

Repair Parts Identification

Guidance on locating item, manufacturing, and serial numbers for repair parts.

Black Max BM21LWSS Specifications

General IconGeneral
Power SourceGasoline
Engine Type4-stroke
Drive TypeSelf-Propelled
Starter TypeRecoil
Mulching CapabilityYes
Bagging CapabilityYes
Side Discharge CapabilityYes
Cutting Width21 inches
Discharge OptionsSide, Mulch, Bag
Wheel Size8 inches (front), 11 inches (rear)