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Black & Decker LST420 User Manual

Black & Decker LST420
42 pages
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INSTRUCTION MANUAL
20V max* Trimmer/edger
KEY INFORMATION YOU SHOULD KNOW:
The guard must be installed before trimming or edging - if not, the motor will overheat.
When replacing the line, use only .065 inch diameter ROUND line (B+D Model #AF-100
is recommended) - otherwise the trimmer will not function properly.
Do not bump the feed head against the ground - it will disrupt the automatic feed
mechanism.
Thank you for choosing BLACK+DECKER!
PLEASE READ BEFORE RETURNING THIS PRODUCT FOR ANY REASON.
If you have a question or experience a problem with your BLACK+DECKER purchase, go
to http://www.blackanddecker.com/instantanswers
If you can’t find the answer or do not have access to the Internet,
call 1-800-544-6986 from 8 a.m. to 5 p.m. EST Mon. - Fri. to speak with an agent.
Please have the catalog number available when you call.
SAVE THIS MANUAL FOR FUTURE REFERENCE.
VEA EL ESPANOL EN LA CONTRAPORTADA.
INSTRUCTIVO DE OPERACIÓN, CENTROS DE SERVICIO Y PÓLIZA DE GARANTÍA.
ADVERTENCIA: LÉASE ESTE INSTRUCTIVO ANTES DE USAR EL PRODUCTO.
*Maximum initial battery pack voltage (measured without a workload) is 20 volts. Measured under a workload,
nominal voltage is 18.
CATALOG NUMBERS
LST400, LST420
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Black & Decker LST420 Specifications

General IconGeneral
Power SourceBattery
Battery TypeLithium-Ion
Battery Voltage20 V
Cutting Swath12 inches
Line Diameter0.065 inches

Summary

SAFETY GUIDELINES AND DEFINITIONS

GENERAL SAFETY PRECAUTIONS

Read and save instructions before use, understand all safety information to reduce injury risk.

CHEMICAL EXPOSURE WARNING

Warns about product dust chemicals and recommends safety equipment like dust masks.

PERSONAL PROTECTIVE EQUIPMENT (PPE)

Mandates safety glasses, hearing protection, and optional respiratory protection for safe operation.

OPERATING PRECAUTIONS

Covers essential operating rules: guard, dress, clear of line, bystander safety, edging.

CONTINUED SAFETY WARNINGS

USAGE AND HANDLING PRECAUTIONS

Avoid accidental starting, forcing, overreaching, and damage to the trimmer during use.

ENVIRONMENTAL AND STORAGE RULES

Avoid wet/explosive conditions, store indoors, stay alert, and maintain dry handles.

MAINTENANCE AND REPAIR SAFETY

Use identical parts, check damaged components, clean air intake, avoid water immersion.

SPECIFIC OPERATIONAL WARNINGS

Warnings on chemical storage, pressure washers, guards, and faulty switch triggers for safe use.

SYMBOLS EXPLANATION

IMPORTANT SAFETY INSTRUCTIONS FOR BATTERY CHARGERS

CHARGER GENERAL SAFETY

Read instructions, avoid liquids, charge only specified batteries, keep away from foreign materials.

EXTENSION CORD GUIDELINES

Use appropriate gauge extension cords; consult chart for wire size based on length and amperage.

CHARGER PLACEMENT AND HANDLING

Do not block vents, avoid soft surfaces, heat sources, or wall mounting; unplug before cleaning.

DAMAGED CHARGER OPERATION

Do not use damaged chargers; take to service center if dropped, blown, or otherwise damaged.

IMPORTANT SAFETY INSTRUCTIONS FOR BATTERY PACKS

BATTERY PACK HANDLING AND SAFETY

Do not incinerate, use in explosive atmospheres, or expose to liquids; wash skin contact immediately.

BATTERY PACK OPERATION WARNINGS

Charge only in specified chargers; avoid splashing, immersion, and extreme temperatures (over 105°F).

BATTERY PACK DAMAGE AND STORAGE

Do not open damaged packs, avoid dropping, protect terminals from short circuits during transport.

STORAGE RECOMMENDATIONS

Store battery packs in a cool, dry place away from direct sunlight and extreme temperatures.

FUNCTIONAL DESCRIPTION

COMPATIBLE LI-ION BATTERY PACKS AND CHARGERS

CHARGING PROCEDURE

BATTERY CHARGER MANAGEMENT

LEAVING THE BATTERY IN THE CHARGER

Information on leaving the battery pack connected to the charger for maintenance.

IMPORTANT CHARGING NOTES

Notes on optimal charging temperatures, charger/battery warmth, and troubleshooting charging issues.

BATTERY PACK INSTALLATION AND REMOVAL

Instructions on how to safely install and remove the battery pack from the trimmer.

ASSEMBLY AND ADJUSTMENT

INSTALLING THE GUARD

Instructions for attaching the guard to the trimmer motor housing securely.

AUXILIARY HANDLE ADJUSTMENT

Steps to attach and adjust the auxiliary handle for optimal balance and comfort.

TRIMMER HEIGHT ADJUSTMENT

Instructions for adjusting the trimmer's telescopic height for comfortable use.

OPERATING INSTRUCTIONS

SWITCHING THE TRIMMER ON AND OFF

How to turn the trimmer on using the lock-off button and trigger switch.

PROPER TRIMMER OPERATION

Guidelines for operating the trimmer, including angle, distance, and cutting techniques.

OPERATIONAL MODES AND CONVERSIONS

CONVERTING TO EDGING MODE

Instructions on how to convert the trimmer from trimming to edging mode.

ACCELERATOR SWITCH MODES

Explanation of the two operating modes: extended runtime and accelerated cutting speed.

CUTTING LINE AND REPLACEMENT

CUTTING LINE AND FEEDING

Information on the type of cutting line used and how the automatic feed system works.

REPLACEMENT ACCESSORIES AND SPOOL REPLACEMENT

Details on recommended accessories and step-by-step instructions for replacing the spool.

REWINDING SPOOL FROM BULK LINE

TRIMMER MAINTENANCE

TROUBLESHOOTING

TRIMMER RUNS SLOWLY

Troubleshooting steps for when the trimmer runs slowly or with insufficient power.

AUTOMATIC LINE FEED ISSUES

Steps to troubleshoot problems with the automatic line feed system.

TROUBLESHOOTING CONTINUED

LINE FEED AND SPOOL JAMMING

Further troubleshooting for line feed problems, including spool jamming and cleaning.

BATTERY RECYCLING AND SERVICE INFORMATION

THE RBRCTM SEAL AND RECYCLING

Information about the Rechargeable Battery Recycling Corporation seal and battery recycling.

SERVICE AND TECHNICAL SUPPORT

Details on how to obtain technical advice, repair, or replacement parts from service centers.

FCC RADIO FREQUENCY COMPLIANCE

Regulatory compliance information regarding FCC rules and potential radio interference.

TWO-YEAR LIMITED WARRANTY

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