Mowers & String Trimmers: Thrown Objects Toolbox Talk

A free, ready-to-run toolbox talk for construction crews. Read it aloud at your morning huddle; it takes about ten minutes. Leer en español →

OSHA standard: General Duty Clause 5(a)(1) · 29 CFR 1926.300–302 · ANSI/OPEI B71.4

At a glance

• A mower blade tip moves near 200 mph — whatever it finds leaves as a bullet
• Walk the area first: rocks, wire, sprinkler parts, and trash come up before the machine starts
• Guards and discharge chutes stay on and aimed away from people, cars, and glass
• Nobody inside 50 feet while a mower or trimmer is cutting

Introduction

Thrown objects are the landscaping injury everyone has a close call about: the rock off a mower deck, the wire whipped out of a trimmer head, the chip of block that found an eye. A mower blade tip moves close to 200 miles an hour, and Arizona yards feed it ammunition — decomposed granite, river rock, gravel edges. Most of what a blade throws was visible on the ground before the engine started, and most of what it hits was standing somewhere predictable. Today's talk is the walk-through, the discharge, and the people.

Walk It Before You Cut It

• Police the area first — rocks, wire, irrigation parts, stakes, bottles, and toys all leave the chute as projectiles
• Note the targets before you start: windows, parked cars, walkways, patios, and where people will come from
• Gravel and decomposed granite edges are the worst feed — plan to work them slow, blade high, or with the trimmer instead
• Check the machine too: guard on, chute intact, blade tight and unnicked — a cracked blade tip is itself a projectile

Control the Discharge

• The chute aims the throw — mow so discharge faces away from people, traffic, and glass
• Never lift a running deck over gravel or curbs, and never run with the chute propped or the guard wired back
• String trimmers throw back at YOU — keep the guard on and the head angled so debris goes down and away
• Against rock beds and block walls, ease off — full throttle against rock is a shotgun pattern

People, PPE & the Stop Rule

• Treat 50 feet as the throw zone — stop cutting when anyone enters it and let them pass with the blades stopped
• Kids and pets move fast and low: stop, don't wave them through
• Safety glasses always; glasses PLUS a face shield on string trimmers — trimmer injuries are overwhelmingly eyes and face
• Long pants and sturdy boots around trimmers — no exceptions for heat
• Clearing a clog or flipping a deck: engine off, plug wire pulled or battery out, blade fully stopped — every time

Key takeaways

• Walk and police the area before the first pass
• Guards and chutes stay on, aimed away from people and glass
• Gravel is ammunition — slow down near rock
• 50 feet: nobody in the throw zone while cutting
• Eyes first: glasses always, face shield on trimmers
• Engine off and blade stopped before hands go near the blade

Run this talk with crew sign-offs

This talk is part of the Safirst ONE toolbox talk library, in English and Spanish. Your foreman picks the talk in the app, the crew signs from their own phones by scanning a QR code, and the signed record files itself in your Docs Locker. Talk to Safirst to get it for your crews.

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