Clean the trimmer housing and vents ID: lst300-clean-housing Version: 2.0.0 Model: BLACK+DECKER LST300 · US · AF-100 Region: US Parts: Automatic-feed head with AF-100 spool; match model and tool type to manual Not covered: LST420 / LSTE525; GH corded models; Dual-line heads; Metal line or blades; Nonmatching tool type or modified head; Unknown tool type or missing exact-type manual; Bump-feed conversion MATCH YOUR VERSION Model and tool type: LST300 and the exact type on my label match my manufacturer manual and figures Remove 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 head: Original AF-100 automatic-feed single-line head Do not substitute a bump-feed procedure, dual-line spool or metal cutting attachment. PREPARE [ ] Release the trigger, let the head stop, engage the lock-off and remove the battery. Leave it removed throughout hands-on care. Keep fingers away from the sharp cutter on the guard. [ ] Read LST300 and the tool type from the label. Open the official model/type lookup and compare its manual and parts figures with your actual guard, single-line head and AF-100 spool. A readable model name alone does not establish the type. If the exact type manual cannot be obtained, or any figure differs, save a preparation record and stop. [ ] Tool: Soft rag [ ] Tool: Good lighting [ ] Material: Mild soap [ ] Material: Water only to dampen the rag STOP Keep the battery removed if the exact type/manual match is unknown or parts differ from the figures. Stop for a damaged battery, exposed wiring, a faulty switch, cracked guard, broken spool/hub, damaged cap tabs or housing slots. Use an authorized service center. Never open the battery, motor housing or charger. CONSUMABLE FIT Plastic-housing cleaner: Mild soap on a damp rag; keep liquid out of the tool Fit: External plastic parts only Do not substitute: Immersion, hose, pressure washer; liquid in vents or battery contacts Source: lst300-manual, English p10 Maintenance items 1, 3; p3 Safety CHECK ROUTE safety: Is the battery removed, the trigger released and the cutting head stopped, with no battery damage, exposed wiring or faulty switch? Yes -> compatibility: Keep the battery removed for every hands-on step. No -> service: Stop using the tool for electrical, battery or switch damage. If you have only omitted battery removal, make the tool safe before restarting. Not sure -> prepared: Keep the battery removed. Save your preparation record and check the matching manual before continuing. compatibility: Have you matched the label LST300 AND its exact tool type to the official lookup manual and its figures, with the original AF-100 automatic single-line head? Yes -> check-1: Record the label type and matching manual reference in the first step. No -> prepared: An unknown type, unavailable type manual, different figures, bump-feed head or dual-line conversion blocks this procedure. Use manufacturer support to identify the correct instructions. Not sure -> prepared: Keep the battery removed. Save your preparation record and check the matching manual before continuing. check-1: Is the dirt accessible on the outside of the tool, with no liquid inside or visible electrical damage? Yes -> check-2: Inspect the intake openings and grip surfaces. No -> service: Liquid inside or damaged electrical parts needs service. Not sure -> prepared: Keep the battery removed. Save your preparation record and check the matching manual before continuing. check-2: Can you remove the loose debris without inserting tools into vents or opening the motor housing? Yes -> steps: Use gentle surface cleaning only. No -> service: Leave inaccessible debris for an authorized service center. Not sure -> prepared: Keep the battery removed. Save your preparation record and check the matching manual before continuing. CARE STEPS (only when the route reaches steps) [ ] 1. Record the exact tool and make it safe Release the trigger, let the head stop, engage the lock-off and remove the battery. Leave it removed throughout hands-on care. Keep fingers away from the sharp cutter on the guard. Read LST300 and the tool type from the label. Open the official model/type lookup and compare its manual and parts figures with your actual guard, single-line head and AF-100 spool. A readable model name alone does not establish the type. If the exact type manual cannot be obtained, or any figure differs, save a preparation record and stop. Look for: The battery is physically separate from the tool; your label type and matching manual reference are written below. Source: bd-manual-help, Official model/type lookup instructions; type is beside or below the model number [ ] 2. Locate the dirty areas Set the tool down securely with the guard cutter clear of your hands. Look at the external intake slots, plastic housing and grips. Record whether the slots are covered by grass or only the exterior needs wiping. Look for: You have identified accessible dirt without removing the housing. Source: lst300-manual, English p10 Maintenance items 1, 3; p3 Safety [ ] 3. Lift away loose grass Remove loose grass and dirt from the external slots and housing without pushing it inside. Stop if material is tightly bound into the head or cannot be reached safely. Look for: The visible intake openings are clear rather than packed with debris. Source: lst300-manual, English p10 Maintenance items 1, 3; p3 Safety [ ] 4. Wipe the plastic Apply mild soap to a lightly damp rag and wipe external plastic surfaces. Keep liquid away from openings and battery contacts. Do not immerse the trimmer, spray it with a hose or use a pressure washer. Look for: The rag is damp, not dripping; no liquid enters the tool. Source: lst300-manual, English p10 Maintenance items 1, 3; p3 Safety [ ] 5. Check grips and drying Leave the exterior to dry. Inspect the grips for remaining grease, soap or moisture and wipe them clean. The manual specifies dry, clean handles; it does not prescribe a fixed drying duration for this wipe. Look for: Grips are dry and clean; slots remain visibly unobstructed. Source: lst300-manual, English p10 Maintenance items 1, 3; p3 Safety [ ] 6. Record cleaning and the next action Record the areas cleared and whether the exterior is fully dry. Use the storage task if putting the trimmer away, or the after-care check before normal use. Persistent slow running follows its own troubleshooting task. Look for: You can distinguish a completed wipe from a remaining operational symptom. Source: lst300-manual, English p10 Maintenance items 1, 3; p3 Safety OBSERVATIONS Tool type exactly as printed on the label (required): ____________________ Exact-type manual reference or link that you matched (required): ____________________ Areas cleaned and debris found (required): ____________________ Exterior and grips are completely dry (required): ____________________ Result of this task (required): ____________________ Choices: Checks passed; ready for the stated next step / More preparation or a linked task is needed [further care/preparation needed] / Leave unused and contact service [service required] RESULT CHECKS [ ] External air intakes are visibly clear and no housing was opened. [ ] Plastic and handles are clean and dry; liquid has stayed outside the tool. NEXT CARE Grass or dirt on the external air intakes, plastic housing or handles Keep intakes clear and handles clean and dry; no fixed cleaning interval is stated. Basis: manufacturer Source: lst300-manual, English p10 Maintenance items 1, 3; p3 Safety Record preparation, maintenance readiness, problem located or service needed. This is not proof of a physical repair. SOURCES BLACK+DECKER LST300 instruction manual (manufacturer document, retailer-hosted) https://pdf.lowes.com/productdocuments/1935f26b-7448-4c95-b467-a223bb73d80f/63056925.pdf English p10 Maintenance items 1, 3; p3 Safety Checked: 2026-10-13 Manufacturer copyright, hosted by Lowe’s. Facts paraphrased; no diagrams or manual redistributed. BLACK+DECKER: locate a manual using model and type number https://support.blackanddecker.com/hc/en-us/articles/360012700118-How-can-I-get-a-parts-list-or-manual-for-my-tool Official model/type lookup instructions; type is beside or below the model number Checked: 2026-10-13 Linked only. BLACK+DECKER LST300 product and support https://www.blackanddecker.com/products/lst300 LST300 model identity; Automatic Feed Spool; Includes AF-100 Checked: 2026-10-13 Linked only; no product photos reused.