3 tasks · Garden care

LST300 guard & setup check

Confirm the guard, cap and handle before reinstalling the battery for normal use.

A battery-removed setup record with clear no-go findings.

Match before starting

Model and tool typeRemove the battery before finding the label. Use the manufacturer model-and-type lookup; this site does not infer a type number from LST300 alone.Cutting headDo not substitute a bump-feed procedure, dual-line spool or metal cutting attachment.

Choose the versions you can confirm.

I compared my model, parts and manual.

Have ready

Good lighting
The original matching guard and cap
Battery removed throughout setup

Your care order

Each task keeps its own checks and observations. Return here to review the whole round.

Stage 1
Inspect and secure the guard →
Inspect the correct guard and sharp line cutter with the battery removed.
No result recorded yet.
Stage 2
Check a spool cap that will not latch →
Check the original cap tabs and full seating.
No result recorded yet.
Stage 3
Adjust the auxiliary handle and height →
Set and lock the adjustable handle using the matching manual.
No result recorded yet.

Consumables that fit

Item	Specification & fit	Do not substitute
Guard or mounting screw if a replacement is needed	Exact LST300 tool-type part identified by the manufacturer Supplied undamaged assembly, or a replacement confirmed through authorized service	Unverified guard, substitute screw, damaged tabs or housing threadsEnglish p8 Installing the guard; figs D–E
Replacement spool cap	BLACK+DECKER RC-100, confirmed against the exact tool-type parts list Original compatible AF-100 housing with undamaged slots	Damaged housing; caps with different tabs; forcing an apparently similar partEnglish p9 Cutting line / Line feeding; Replacement accessories

Keep the complete pack

The ZIP includes these three guides, your current task records and your care plan. Add a date to include a calendar reminder.

Sources

BLACK+DECKER LST300 instruction manual (manufacturer document, retailer-hosted)English p8 Installing the guard; figs D–E; English pp9–10 Replacing the spool; figs M–O; English pp8–9 Height adjustment / Operating the trimmer; figs I, J1 · Checked 2026-10-13
BLACK+DECKER: locate a manual using model and type numberOfficial model/type lookup instructions; type is beside or below the model number · Checked 2026-10-13
BLACK+DECKER LST300 product and supportLST300 model identity; Automatic Feed Spool; Includes AF-100 · Checked 2026-10-13